deyituo.github.io/atom.xml at master · deyituo/deyituo.github.io · GitHub

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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
  <title>deyituo - Gogogo</title>

  <link href="/atom.xml" rel="self"/>

  <link href="http://deyituo.github.io/"/>
  <updated>2016-06-15T04:16:53.000Z</updated>
  <id>http://deyituo.github.io/</id>

  <author>
    <name>Deyi Tuo</name>

  </author>

  <generator uri="http://hexo.io/">Hexo</generator>

  <entry>
    <title>scoped_ptr类模版</title>
    <link href="http://deyituo.github.io/2016/06/14/scoped-ptr%E7%B1%BB%E6%A8%A1%E7%89%88/"/>
    <id>http://deyituo.github.io/2016/06/14/scoped-ptr类模版/</id>
    <published>2016-06-14T02:07:06.000Z</published>
    <updated>2016-06-15T04:16:53.000Z</updated>

    <content type="html">&lt;blockquote&gt;
&lt;p&gt;&amp;#x6700;&amp;#x8FD1;&amp;#x5728;&amp;#x770B;&amp;#x9648;&amp;#x7855;&amp;#x7684;&amp;#x300A;Linux&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x670D;&amp;#x52A1;&amp;#x7AEF;&amp;#x7F16;&amp;#x7A0B;&amp;#xFF1A;&amp;#x4F7F;&amp;#x7528;muduo C++&amp;#x7F51;&amp;#x7EDC;&amp;#x5E93;&amp;#x300B;&amp;#xFF0C;&amp;#x7B2C;&amp;#x4E00;&amp;#x7AE0;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x8BB2;&amp;#x4E86;&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x4E0B;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5904;&amp;#x7406;&amp;#x95EE;&amp;#x9898;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x662F; shared_ptr &amp;#x4E0E; weak_ptr, &amp;#x5176;&amp;#x4E2D;&amp;#x8FD8;&amp;#x63D0;&amp;#x5230;&amp;#x5728;&amp;#x5185;&amp;#x5B58;&amp;#x6CC4;&amp;#x9732;&amp;#x548C;&amp;#x91CD;&amp;#x590D;&amp;#x91CA;&amp;#x653E;&amp;#x4E2D;&amp;#x4F7F;&amp;#x7528; scoped_ptr&amp;#x3002; &amp;#x4E0A;&amp;#x4E09;&amp;#x7BC7;&amp;#x5B66;&amp;#x4E60;&amp;#x4E86; shared_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/09/shared-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;shared_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; ,&lt;a href=&quot;/2016/06/12/shared-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;-2/&quot;&gt;shared_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x677F;(2)&lt;/a&gt;) &amp;#x548C; weak_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/11/weak-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;waek_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; ) &amp;#xFF0C;&amp;#x4ECA;&amp;#x5929;&amp;#x7EE7;&amp;#x7EED;&amp;#x5B66;&amp;#x4E60; scoped_ptr &amp;#xFF0C;&amp;#x4EE5;&amp;#x4E0B;&amp;#x662F;&amp;#x5BF9; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/scoped_ptr.htm&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;scoped_ptr class template&lt;/a&gt;  &amp;#x7684;&amp;#x90E8;&amp;#x5206;&amp;#x4E2D;&amp;#x6587;&amp;#x7FFB;&amp;#x8BD1;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;a id=&quot;more&quot;&gt;&lt;/a&gt;
&lt;h2 id=&quot;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5;&quot;&gt;&lt;a href=&quot;#&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5;&quot;&gt;&lt;/a&gt;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5;&lt;/h2&gt;&lt;h3 id=&quot;&amp;#x4FDD;&amp;#x8BC1;&amp;#x9500;&amp;#x6BC1;&quot;&gt;&lt;a href=&quot;#&amp;#x4FDD;&amp;#x8BC1;&amp;#x9500;&amp;#x6BC1;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x4FDD;&amp;#x8BC1;&amp;#x9500;&amp;#x6BC1;&quot;&gt;&lt;/a&gt;&amp;#x4FDD;&amp;#x8BC1;&amp;#x9500;&amp;#x6BC1;&lt;/h3&gt;&lt;p&gt;scoped_ptr &amp;#x4FDD;&amp;#x5B58;&amp;#x4E86;&amp;#x52A8;&amp;#x6001;&amp;#x5206;&amp;#x914D;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x6307;&amp;#x9488; (C++ &amp;#x7684; new &amp;#x64CD;&amp;#x4F5C;&amp;#x7B26;)&amp;#x3002;&amp;#x5F53; scoped_ptr &amp;#x88AB;&amp;#x6790;&amp;#x6784;&amp;#x6216;&amp;#x8005; reset &amp;#x7684;&amp;#x65F6;&amp;#x5019;&amp;#xFF0C;&amp;#x88AB;&amp;#x6307;&amp;#x5411;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x4FDD;&amp;#x8BC1;&amp;#x88AB;&amp;#x9500;&amp;#x6BC1;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x4E0D;&amp;#x53EF;&amp;#x590D;&amp;#x5236;&quot;&gt;&lt;a href=&quot;#&amp;#x4E0D;&amp;#x53EF;&amp;#x590D;&amp;#x5236;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x4E0D;&amp;#x53EF;&amp;#x590D;&amp;#x5236;&quot;&gt;&lt;/a&gt;&amp;#x4E0D;&amp;#x53EF;&amp;#x590D;&amp;#x5236;&lt;/h3&gt;&lt;p&gt;scoped_ptr &amp;#x6A21;&amp;#x7248;&amp;#x63D0;&amp;#x4F9B;&amp;#x4E86;&amp;#x57FA;&amp;#x672C;&amp;#x7684;&amp;#x201C;&amp;#x8D44;&amp;#x6E90;&amp;#x53EA;&amp;#x9700;&amp;#x8981;&amp;#x521D;&amp;#x59CB;&amp;#x5316;&amp;#x201D;&amp;#x7684;&amp;#x673A;&amp;#x5236;&amp;#xFF0C;&amp;#x6CA1;&amp;#x6709;&amp;#x5171;&amp;#x4EAB;&amp;#x6240;&amp;#x6709;&amp;#x6743;&amp;#x6216;&amp;#x8005;&amp;#x4F20;&amp;#x9012;&amp;#x6240;&amp;#x6709;&amp;#x6743;&amp;#x7684;&amp;#x8BED;&amp;#x4E49;&amp;#xFF0C;&amp;#x53EA;&amp;#x662F;&amp;#x5728;&amp;#x5F53;&amp;#x524D;&amp;#x7684;&amp;#x8303;&amp;#x56F4;&amp;#x4FDD;&amp;#x7559;&amp;#x6240;&amp;#x6709;&amp;#x6743; (&lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/utility/utility.htm#Class_noncopyable&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;noncopyable&lt;/a&gt;)&amp;#xFF0C;&amp;#x56E0;&amp;#x4E3A;&amp;#x5B83;&amp;#x4E0D;&amp;#x80FD;&amp;#x62F7;&amp;#x8D1D;&amp;#xFF0C;&amp;#x6240;&amp;#x4EE5;&amp;#x5BF9;&amp;#x4E8E;&amp;#x4E0D;&amp;#x5E94;&amp;#x8BE5;&amp;#x88AB;&amp;#x590D;&amp;#x5236;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&amp;#x6BD4; shared_ptr &amp;#x6216;&amp;#x8005; std::auto_ptr &amp;#x8981;&amp;#x5B89;&amp;#x5168;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x6548;&amp;#x7387;&amp;#x4E0E;&amp;#x7A7A;&amp;#x95F4;&quot;&gt;&lt;a href=&quot;#&amp;#x6548;&amp;#x7387;&amp;#x4E0E;&amp;#x7A7A;&amp;#x95F4;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6548;&amp;#x7387;&amp;#x4E0E;&amp;#x7A7A;&amp;#x95F4;&quot;&gt;&lt;/a&gt;&amp;#x6548;&amp;#x7387;&amp;#x4E0E;&amp;#x7A7A;&amp;#x95F4;&lt;/h3&gt;&lt;p&gt;&amp;#x56E0;&amp;#x4E3A; scoped_ptr &amp;#x662F;&amp;#x7B80;&amp;#x5355;&amp;#x7684;&amp;#xFF0C;&amp;#x5B83;&amp;#x7684;&amp;#x64CD;&amp;#x4F5C;&amp;#x4E0E;&amp;#x5185;&amp;#x7F6E;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x4E00;&amp;#x6837;&amp;#x5FEB;&amp;#xFF0C;&amp;#x5360;&amp;#x636E;&amp;#x7684;&amp;#x7A7A;&amp;#x95F4;&amp;#x4E5F;&amp;#x4E0D;&amp;#x591A;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;scoped-ptr-&amp;#x4E0E;-C-&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&quot;&gt;&lt;a href=&quot;#scoped-ptr-&amp;#x4E0E;-C-&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&quot; class=&quot;headerlink&quot; title=&quot;scoped_ptr &amp;#x4E0E; C++ &amp;#x6807;&amp;#x51C6;&amp;#x5E93;&quot;&gt;&lt;/a&gt;scoped_ptr &amp;#x4E0E; C++ &amp;#x6807;&amp;#x51C6;&amp;#x5E93;&lt;/h3&gt;&lt;p&gt;scoped_ptr &amp;#x4E0D;&amp;#x80FD;&amp;#x7528;&amp;#x5728; C++ &amp;#x6807;&amp;#x51C6;&amp;#x5E93;&amp;#x5BB9;&amp;#x5668;&amp;#x4E2D;&amp;#xFF0C;&amp;#x8BF7;&amp;#x4F7F;&amp;#x7528;&amp;#x9700;&amp;#x8981;&amp;#x9700;&amp;#x8981;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x6765;&amp;#x7528;&amp;#x4E8E;&amp;#x5BB9;&amp;#x5668;&amp;#xFF0C;&amp;#x8BF7;&amp;#x4F7F;&amp;#x7528; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/shared_ptr.htm&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;shared_ptr&lt;/a&gt;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x6570;&amp;#x7EC4;&amp;#x6307;&amp;#x9488;&quot;&gt;&lt;a href=&quot;#&amp;#x6570;&amp;#x7EC4;&amp;#x6307;&amp;#x9488;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6570;&amp;#x7EC4;&amp;#x6307;&amp;#x9488;&quot;&gt;&lt;/a&gt;&amp;#x6570;&amp;#x7EC4;&amp;#x6307;&amp;#x9488;&lt;/h3&gt;&lt;p&gt;scoped_ptr &amp;#x4E0D;&amp;#x80FD;&amp;#x6B63;&amp;#x786E;&amp;#x5730;&amp;#x4FDD;&amp;#x5B58;&amp;#x52A8;&amp;#x6001;&amp;#x5206;&amp;#x914D;&amp;#x7684;&amp;#x6570;&amp;#x7EC4;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x3002;&lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/scoped_array.htm&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;scoped_array&lt;/a&gt; &amp;#x63D0;&amp;#x4F9B;&amp;#x4E86;&amp;#x8FD9;&amp;#x7528;&amp;#x9014;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;T-&amp;#x7684;&amp;#x8981;&amp;#x6C42;&quot;&gt;&lt;a href=&quot;#T-&amp;#x7684;&amp;#x8981;&amp;#x6C42;&quot; class=&quot;headerlink&quot; title=&quot;T &amp;#x7684;&amp;#x8981;&amp;#x6C42;&quot;&gt;&lt;/a&gt;T &amp;#x7684;&amp;#x8981;&amp;#x6C42;&lt;/h3&gt;&lt;p&gt;scoped_ptr &amp;#x7684;&amp;#x6A21;&amp;#x7248;&amp;#x53C2;&amp;#x6570; T &amp;#x662F;&amp;#x6307;&amp;#x5411;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x7C7B;&amp;#x578B;&amp;#xFF0C;&amp;#x9700;&amp;#x8981;&amp;#x6EE1;&amp;#x8DB3;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7684; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/smart_ptr.htm#common_requirements&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;&lt;strong&gt;&amp;#x901A;&amp;#x5E38;&amp;#x8981;&amp;#x6C42;&lt;/strong&gt;&lt;/a&gt;&amp;#xFF1A;&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x8FD9;&amp;#x4E9B;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&amp;#x7531;&amp;#x4E00;&amp;#x4E2A;&amp;#x6A21;&amp;#x7248;&amp;#x53C2;&amp;#x6570; T , &amp;#x6307;&amp;#x5B9A;&amp;#x4E86;&amp;#x88AB;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x6307;&amp;#x5411;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&amp;#x5982;&amp;#x679C; T &amp;#x7C7B;&amp;#x578B;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684; &lt;strong&gt;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&lt;/strong&gt; &amp;#x6216;&amp;#x8005; &lt;strong&gt; operator delete&lt;/strong&gt; &amp;#x629B;&amp;#x51FA;&amp;#x5F02;&amp;#x5E38;&amp;#xFF0C;&amp;#x90A3;&amp;#x4E48;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x6A21;&amp;#x7248;&amp;#x7684;&amp;#x884C;&amp;#x4E3A;&amp;#x65E0;&amp;#x5B9A;&amp;#x4E49;&amp;#x3002;&lt;br&gt;&amp;#x5728;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x58F0;&amp;#x660E;&amp;#x7684;&amp;#x65F6;&amp;#x5019;&amp;#xFF0C;T &amp;#x53EF;&amp;#x80FD;&amp;#x662F;&amp;#x4E0D;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&amp;#x9664;&amp;#x975E;&amp;#x7279;&amp;#x522B;&amp;#x8BF4;&amp;#x660E;&amp;#xFF0C;&amp;#x5F53;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x5B9E;&amp;#x4F8B;&amp;#x5316;&amp;#x7684;&amp;#x65F6;&amp;#x5019;&amp;#xFF0C;&amp;#x9700;&amp;#x8981; T &amp;#x662F;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&amp;#x5B9E;&amp;#x73B0;&amp;#x9700;&amp;#x8981;&amp;#x68C0;&amp;#x67E5;&amp;#x6240;&amp;#x6709;&amp;#x8FDD;&amp;#x53CD;&amp;#x8BE5;&amp;#x9700;&amp;#x6C42;&amp;#x7684;&amp;#x60C5;&amp;#x51B5;&amp;#xFF0C;&amp;#x5305;&amp;#x62EC;&amp;#x4E0D;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x7684;&amp;#x9500;&amp;#x6BC1;&amp;#x64CD;&amp;#x4F5C;&amp;#x3002;&amp;#xFF0D;&amp;gt;&amp;#x67E5;&amp;#x770B; [checked delete] &amp;#x51FD;&amp;#x6570;&amp;#x6A21;&amp;#x7248;&amp;#x7684;&amp;#x63CF;&amp;#x8FF0;&amp;#x3002;&lt;br&gt;&amp;#x6CE8;&amp;#x610F; shared_ptr &amp;#x6CA1;&amp;#x6709;&amp;#x8FD9;&amp;#x4E2A;&amp;#x9650;&amp;#x5236;&amp;#xFF0C;&amp;#x56E0;&amp;#x4E3A;&amp;#x5B83;&amp;#x7684;&amp;#x5927;&amp;#x591A;&amp;#x6570;&amp;#x6210;&amp;#x5458;&amp;#x51FD;&amp;#x6570;&amp;#x4E0D;&amp;#x9700;&amp;#x8981; T &amp;#x662F;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&lt;br&gt;&amp;#x6CE8;&amp;#x610F;&amp;#x6790;&amp;#x6784;&amp;#x65F6;&amp;#xFF0C;scoped_ptr &amp;#x9700;&amp;#x8981; T &amp;#x662F;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#xFF0C;&amp;#x800C; shared_ptr &amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h2 id=&quot;Synopsis&quot;&gt;&lt;a href=&quot;#Synopsis&quot; class=&quot;headerlink&quot; title=&quot;Synopsis&quot;&gt;&lt;/a&gt;Synopsis&lt;/h2&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;namespace&lt;/span&gt; boost {&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; scoped_ptr : noncopyable {&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;   &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     &lt;span class=&quot;keyword&quot;&gt;typedef&lt;/span&gt; T element_type;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;explicit&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;scoped_ptr&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(T * p = &lt;span class=&quot;number&quot;&gt;0&lt;/span&gt;)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     ~scoped_ptr(); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(T * p = &lt;span class=&quot;number&quot;&gt;0&lt;/span&gt;)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     T &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;*() &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     T * &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;-&amp;gt;() &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     &lt;span class=&quot;function&quot;&gt;T * &lt;span class=&quot;title&quot;&gt;get&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     &lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt; unspecified-&lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt;-type() &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;     &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(scoped_ptr &amp;amp; b)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  };&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(scoped_ptr&amp;lt;T&amp;gt; &amp;amp; a, scoped_ptr&amp;lt;T&amp;gt; &amp;amp; b)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;h2 id=&quot;Members&quot;&gt;&lt;a href=&quot;#Members&quot; class=&quot;headerlink&quot; title=&quot;Members&quot;&gt;&lt;/a&gt;Members&lt;/h2&gt;&lt;h3 id=&quot;element-type&quot;&gt;&lt;a href=&quot;#element-type&quot; class=&quot;headerlink&quot; title=&quot;element_type&quot;&gt;&lt;/a&gt;element_type&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;typedef&lt;/span&gt; T element_type;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x5B58;&amp;#x50A8;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;explicit&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;scoped_ptr&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(T * p = &lt;span class=&quot;number&quot;&gt;0&lt;/span&gt;)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x6784;&amp;#x5EFA;&amp;#x4E00;&amp;#x4E2A; scopeda_ptr, &amp;#x5B58;&amp;#x50A8;&amp;#x4E86; p &amp;#x7684;&amp;#x62F7;&amp;#x8D1D; (p &amp;#x5FC5;&amp;#x987B;&amp;#x7531; new &amp;#x8868;&amp;#x8FBE;&amp;#x5F0F;&amp;#x5206;&amp;#x914D;&amp;#x6216;&amp;#x8005;&amp;#x4E3A; 0)&amp;#x3002;T &amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x662F;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#xFF0C;&amp;#x770B;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7684; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/smart_ptr.htm#common_requirements&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;&lt;strong&gt;&amp;#x901A;&amp;#x5E38;&amp;#x8981;&amp;#x6C42;&lt;/strong&gt;&lt;/a&gt;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;~scoped_ptr(); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x6790;&amp;#x6784;&amp;#x4FDD;&amp;#x5B58;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x6307;&amp;#x5411;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#xFF0C;&amp;#x548C; delete this-&amp;gt;get() &amp;#x6548;&amp;#x679C;&amp;#x4E00;&amp;#x6837;&amp;#x3002;&lt;/p&gt;
&lt;p&gt;&amp;#x4E0D;&amp;#x629B;&amp;#x51FA;&amp;#x5F02;&amp;#x5E38;&amp;#x4F7F;&amp;#x7528;&amp;#x4E86; delete &amp;#x5BF9;&amp;#x8C61;&amp;#x65F6;&amp;#x4E0D;&amp;#x629B;&amp;#x51FA;&amp;#x5F02;&amp;#x5E38;&amp;#x7684;&amp;#x8981;&amp;#x6C42;&amp;#x3002;&amp;#x770B;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7684; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/smart_ptr.htm#common_requirements&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;&lt;strong&gt;&amp;#x901A;&amp;#x5E38;&amp;#x8981;&amp;#x6C42;&lt;/strong&gt;&lt;/a&gt;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;reset&quot;&gt;&lt;a href=&quot;#reset&quot; class=&quot;headerlink&quot; title=&quot;reset&quot;&gt;&lt;/a&gt;reset&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(T * p = &lt;span class=&quot;number&quot;&gt;0&lt;/span&gt;)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x6790;&amp;#x6784;&amp;#x4FDD;&amp;#x5B58;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x6307;&amp;#x5411;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#xFF0C;&amp;#x518D;&amp;#x4FDD;&amp;#x5B58; p &amp;#x7684;&amp;#x62F7;&amp;#x8D1D; (p &amp;#x5FC5;&amp;#x987B;&amp;#x7531; new &amp;#x8868;&amp;#x8FBE;&amp;#x5F0F;&amp;#x5206;&amp;#x914D;&amp;#x6216;&amp;#x8005;&amp;#x4E3A; 0)&amp;#x3002;&amp;#x4E0D;&amp;#x629B;&amp;#x51FA;&amp;#x5F02;&amp;#x5E38;&amp;#x4F7F;&amp;#x7528;&amp;#x4E86; delete &amp;#x5BF9;&amp;#x8C61;&amp;#x65F6;&amp;#x4E0D;&amp;#x629B;&amp;#x51FA;&amp;#x5F02;&amp;#x5E38;&amp;#x7684;&amp;#x8981;&amp;#x6C42;&amp;#x3002;&amp;#x770B;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7684; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/smart_ptr.htm#common_requirements&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;&lt;strong&gt;&amp;#x901A;&amp;#x5E38;&amp;#x8981;&amp;#x6C42;&lt;/strong&gt;&lt;/a&gt;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;indirection&quot;&gt;&lt;a href=&quot;#indirection&quot; class=&quot;headerlink&quot; title=&quot;indirection&quot;&gt;&lt;/a&gt;indirection&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;T &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;*() &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#x4FDD;&amp;#x5B58;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x6307;&amp;#x5411;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x5F15;&amp;#x7528;&amp;#xFF0C;&amp;#x5982;&amp;#x679C;&amp;#x4FDD;&amp;#x5B58;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x4E3A; 0&amp;#xFF0C;&amp;#x90A3;&amp;#x4E48;&amp;#x884C;&amp;#x4E3A;&amp;#x5C06;&amp;#x662F;&amp;#x672A;&amp;#x5B9A;&amp;#x4E49;&amp;#x7684;&amp;#x3002;&lt;/p&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;T * &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;-&amp;gt;() &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#x4FDD;&amp;#x5B58;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&amp;#x5982;&amp;#x679C;&amp;#x4FDD;&amp;#x5B58;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x4E3A; 0&amp;#xFF0C;&amp;#x90A3;&amp;#x4E48;&amp;#x884C;&amp;#x4E3A;&amp;#x5C06;&amp;#x662F;&amp;#x672A;&amp;#x5B9A;&amp;#x4E49;&amp;#x7684;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;get&quot;&gt;&lt;a href=&quot;#get&quot; class=&quot;headerlink&quot; title=&quot;get&quot;&gt;&lt;/a&gt;get&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;T * &lt;span class=&quot;title&quot;&gt;get&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#x4FDD;&amp;#x5B58;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&lt;strong&gt;T &amp;#x5FC5;&amp;#x987B;&amp;#x4E3A;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&lt;/strong&gt;&amp;#x3002;&amp;#x770B;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7684; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/smart_ptr.htm#common_requirements&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;&lt;strong&gt;&amp;#x901A;&amp;#x5E38;&amp;#x8981;&amp;#x6C42;&lt;/strong&gt;&lt;/a&gt;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;conversions&quot;&gt;&lt;a href=&quot;#conversions&quot; class=&quot;headerlink&quot; title=&quot;conversions&quot;&gt;&lt;/a&gt;conversions&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt; unspecified-&lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt;-type () &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#x672A;&amp;#x6307;&amp;#x5B9A;&amp;#x7684;&amp;#x503C;&amp;#xFF0C;&amp;#x5F53;&amp;#x7528;&amp;#x4E8E; boolean &amp;#x4E0A;&amp;#x4E0B;&amp;#x6587;&amp;#x65F6;&amp;#xFF0C;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; get() != 0&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;swap&quot;&gt;&lt;a href=&quot;#swap&quot; class=&quot;headerlink&quot; title=&quot;swap&quot;&gt;&lt;/a&gt;swap&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(scoped_ptr &amp;amp; b)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x4EA4;&amp;#x6362;&amp;#x4E24;&amp;#x4E2A;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5185;&amp;#x5BB9;&amp;#xFF0C;T &amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x4E3A;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&amp;#x770B;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7684; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/smart_ptr.htm#common_requirements&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;&lt;strong&gt;&amp;#x901A;&amp;#x5E38;&amp;#x8981;&amp;#x6C42;&lt;/strong&gt;&lt;/a&gt;&amp;#x3002;&lt;/p&gt;
&lt;h2 id=&quot;Free-Functions&quot;&gt;&lt;a href=&quot;#Free-Functions&quot; class=&quot;headerlink&quot; title=&quot;Free Functions&quot;&gt;&lt;/a&gt;Free Functions&lt;/h2&gt;&lt;figure class=&quot;highlight ruby&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;template&amp;lt;&lt;span class=&quot;class&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;T&lt;/span&gt;&amp;gt; &lt;span class=&quot;title&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;(&lt;span class=&quot;title&quot;&gt;scoped_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &amp;amp; &lt;span class=&quot;title&quot;&gt;a&lt;/span&gt;, &lt;span class=&quot;title&quot;&gt;scoped_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &amp;amp; &lt;span class=&quot;title&quot;&gt;b&lt;/span&gt;);&lt;/span&gt; /&lt;span class=&quot;regexp&quot;&gt;/ never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; a.swap(b)&amp;#x3002;&amp;#x7B26;&amp;#x5408; std::swap &amp;#x63A5;&amp;#x53E3;&amp;#xFF0C;&amp;#x63D0;&amp;#x4F9B;&amp;#x4E86;&amp;#x6CDB;&amp;#x578B;&amp;#x7F16;&amp;#x7A0B;&amp;#x7684;&amp;#x652F;&amp;#x6301;&amp;#x3002;&lt;/p&gt;
&lt;h2 id=&quot;Example&quot;&gt;&lt;a href=&quot;#Example&quot; class=&quot;headerlink&quot; title=&quot;Example&quot;&gt;&lt;/a&gt;Example&lt;/h2&gt;&lt;p&gt;&amp;#x4E0B;&amp;#x9762;&amp;#x8FD9;&amp;#x4E2A;&amp;#x4F8B;&amp;#x5B50;&amp;#x5C55;&amp;#x793A;&amp;#x4E86; scoped_ptr &amp;#x7684;&amp;#x4F7F;&amp;#x7528;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// scoped_ptr_example1.cpp&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;meta-string&quot;&gt;&amp;lt;boost/scoped_ptr.hpp&amp;gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;meta-string&quot;&gt;&amp;lt;iostream&amp;gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;struct&lt;/span&gt; Shoe { ~Shoe() { &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;cout&lt;/span&gt; &amp;lt;&amp;lt; &lt;span class=&quot;string&quot;&gt;&amp;quot;Buckle my shoe\n&amp;quot;&lt;/span&gt;; } };&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; MyClass {&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    boost::scoped_ptr&amp;lt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;&amp;gt; ptr;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    MyClass() : ptr(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;) { *ptr = &lt;span class=&quot;number&quot;&gt;0&lt;/span&gt;; }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;add_one&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;/span&gt;{ &lt;span class=&quot;keyword&quot;&gt;return&lt;/span&gt; ++*ptr; }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;main&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    boost::scoped_ptr&amp;lt;Shoe&amp;gt; x(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; Shoe);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    MyClass my_instance;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;cout&lt;/span&gt; &amp;lt;&amp;lt; my_instance.add_one() &amp;lt;&amp;lt; &lt;span class=&quot;string&quot;&gt;&amp;apos;\n&amp;apos;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;cout&lt;/span&gt; &amp;lt;&amp;lt; my_instance.add_one() &amp;lt;&amp;lt; &lt;span class=&quot;string&quot;&gt;&amp;apos;\n&amp;apos;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x7F16;&amp;#x8BD1;&amp;#x8FD0;&amp;#x884C;&lt;br&gt;&lt;figure class=&quot;highlight stylus&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;g++ -g scoped_ptr_example1&lt;span class=&quot;selector-class&quot;&gt;.cpp&lt;/span&gt; -o scoped_ptr_example1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;./scoped_ptr_example1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;number&quot;&gt;1&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;Buckle my shoe&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;h2 id=&quot;Rationale&quot;&gt;&lt;a href=&quot;#Rationale&quot; class=&quot;headerlink&quot; title=&quot;Rationale&quot;&gt;&lt;/a&gt;Rationale&lt;/h2&gt;&lt;p&gt;&amp;#x4F7F;&amp;#x7528; scoped_ptr &amp;#x7684;&amp;#x4E3B;&amp;#x8981;&amp;#x539F;&amp;#x56E0;&amp;#x662F;&amp;#x5B83; &amp;#x6BD4; auto_ptr &amp;#x66F4;&amp;#x52A0;&amp;#x76F4;&amp;#x89C2;&amp;#xFF0C;&amp;#x66F4;&amp;#x52A0;&amp;#x4FBF;&amp;#x4E8E;&amp;#x7EF4;&amp;#x62A4;&amp;#x3002;&lt;/p&gt;
&lt;h2 id=&quot;Handle-Body-Idiom&quot;&gt;&lt;a href=&quot;#Handle-Body-Idiom&quot; class=&quot;headerlink&quot; title=&quot;Handle/Body Idiom&quot;&gt;&lt;/a&gt;Handle/Body Idiom&lt;/h2&gt;&lt;p&gt;scoped_ptr &amp;#x7684;&amp;#x4E00;&amp;#x4E2A;&amp;#x901A;&amp;#x5E38;&amp;#x7528;&amp;#x6CD5;&amp;#x662F;&amp;#x5B9E;&amp;#x73B0; handle/body (&amp;#x4E5F;&amp;#x79F0;&amp;#x4E3A; pimpl) idiom&amp;#xFF0C;&amp;#x5B83;&amp;#x80FD;&amp;#x907F;&amp;#x514D;&amp;#x518D;&amp;#x5934;&amp;#x6587;&amp;#x4EF6;&amp;#x4E2D;&amp;#x66B4;&amp;#x9732;&amp;#x5177;&amp;#x4F53;&amp;#x5B9E;&amp;#x73B0;&amp;#x3002;&lt;br&gt;&lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/example/scoped_ptr_example_test.cpp&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;scoped_ptr_example_test.cpp&lt;/a&gt; &amp;#x4F8B;&amp;#x5B50;&amp;#x5305;&amp;#x542B;&amp;#x4E86;&amp;#x4E00;&amp;#x4E2A;&amp;#x4F7F;&amp;#x7528; scoped_ptr&amp;lt;&amp;gt; &amp;#x6765;&amp;#x9690;&amp;#x85CF;&amp;#x5B9E;&amp;#x73B0;&amp;#x7684;&amp;#x5934;&amp;#x6587;&amp;#x4EF6; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/example/scoped_ptr_example.hpp&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;scoped_ptr_example.hpp&lt;/a&gt; &amp;#x548C; &amp;#x5305;&amp;#x542B;&amp;#x4E86;&amp;#x9700;&amp;#x8981;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x7684;&amp;#x6210;&amp;#x5458;&amp;#x51FD;&amp;#x6570;&amp;#x5B9E;&amp;#x4F8B;&amp;#x5316; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/example/scoped_ptr_example.cpp&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;scoped_ptr_example.cpp&lt;/a&gt;&amp;#x3002;&lt;/p&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;25&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;26&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;27&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;28&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;29&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;30&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// scoped_ptr_example.hpp&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Boost scoped_ptr_example header file  ------------------------------------//&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Copyright Beman Dawes 2001.  Distributed under the Boost&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Software License, Version 1.0. (See accompanying file&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  See http://www.boost.org/libs/smart_ptr for documentation.&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;meta-string&quot;&gt;&amp;lt;boost/utility.hpp&amp;gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;meta-string&quot;&gt;&amp;lt;boost/scoped_ptr.hpp&amp;gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  The point of this example is to prove that even though&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  example::implementation is an incomplete type in translation units using&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  this header, scoped_ptr&amp;lt; implementation &amp;gt; is still valid because the type&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  is complete where it counts - in the inplementation translation unit where&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  destruction is actually instantiated.&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; example : &lt;span class=&quot;keyword&quot;&gt;private&lt;/span&gt; boost::noncopyable&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt; &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  example();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  ~example();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;do_something&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt; &lt;span class=&quot;keyword&quot;&gt;private&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; implementation;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  boost::scoped_ptr&amp;lt; implementation &amp;gt; _imp; &lt;span class=&quot;comment&quot;&gt;// hide implementation details&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;25&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// scoped_ptr_example.cpp&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// Boost scoped_ptr_example implementation file  -----------------------------//&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Copyright Beman Dawes 2001.  Distributed under the Boost&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Software License, Version 1.0. (See accompanying file&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  See http://www.boost.org/libs/smart_ptr for documentation.&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;string&quot;&gt;&amp;quot;scoped_ptr_example.hpp&amp;quot;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;meta-string&quot;&gt;&amp;lt;iostream&amp;gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; example::implementation&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt; &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  ~implementation() { &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;cout&lt;/span&gt; &amp;lt;&amp;lt; &lt;span class=&quot;string&quot;&gt;&amp;quot;destroying implementation\n&amp;quot;&lt;/span&gt;; }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;example::example() : _imp( &lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; implementation ) {}&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; example::do_something() { &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;cout&lt;/span&gt; &amp;lt;&amp;lt; &lt;span class=&quot;string&quot;&gt;&amp;quot;did something\n&amp;quot;&lt;/span&gt;; }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;example::~example() {}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// Boost scoped_ptr_example_test main program  -------------------------------//&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Copyright Beman Dawes 2001.  Distributed under the Boost&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Software License, Version 1.0. (See accompanying file&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  See http://www.boost.org/libs/smart_ptr for documentation.&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;string&quot;&gt;&amp;quot;scoped_ptr_example.hpp&amp;quot;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;main&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  example my_example;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  my_example.do_something();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;return&lt;/span&gt; &lt;span class=&quot;number&quot;&gt;0&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x7F16;&amp;#x8BD1;&amp;#x8FD0;&amp;#x884C;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;g++ -g scoped_ptr_example.cpp scoped_ptr_example_test.cpp -o scoped_ptr_example_test&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;./scoped_ptr_example_test&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;did something&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;destroying implementation&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
</content>

    <summary type="html">

      &lt;blockquote&gt;
&lt;p&gt;&amp;#x6700;&amp;#x8FD1;&amp;#x5728;&amp;#x770B;&amp;#x9648;&amp;#x7855;&amp;#x7684;&amp;#x300A;Linux&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x670D;&amp;#x52A1;&amp;#x7AEF;&amp;#x7F16;&amp;#x7A0B;&amp;#xFF1A;&amp;#x4F7F;&amp;#x7528;muduo C++&amp;#x7F51;&amp;#x7EDC;&amp;#x5E93;&amp;#x300B;&amp;#xFF0C;&amp;#x7B2C;&amp;#x4E00;&amp;#x7AE0;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x8BB2;&amp;#x4E86;&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x4E0B;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5904;&amp;#x7406;&amp;#x95EE;&amp;#x9898;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x662F; shared_ptr &amp;#x4E0E; weak_ptr, &amp;#x5176;&amp;#x4E2D;&amp;#x8FD8;&amp;#x63D0;&amp;#x5230;&amp;#x5728;&amp;#x5185;&amp;#x5B58;&amp;#x6CC4;&amp;#x9732;&amp;#x548C;&amp;#x91CD;&amp;#x590D;&amp;#x91CA;&amp;#x653E;&amp;#x4E2D;&amp;#x4F7F;&amp;#x7528; scoped_ptr&amp;#x3002; &amp;#x4E0A;&amp;#x4E09;&amp;#x7BC7;&amp;#x5B66;&amp;#x4E60;&amp;#x4E86; shared_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/09/shared-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;shared_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; ,&lt;a href=&quot;/2016/06/12/shared-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;-2/&quot;&gt;shared_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x677F;(2)&lt;/a&gt;) &amp;#x548C; weak_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/11/weak-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;waek_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; ) &amp;#xFF0C;&amp;#x4ECA;&amp;#x5929;&amp;#x7EE7;&amp;#x7EED;&amp;#x5B66;&amp;#x4E60; scoped_ptr &amp;#xFF0C;&amp;#x4EE5;&amp;#x4E0B;&amp;#x662F;&amp;#x5BF9; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/scoped_ptr.htm&quot;&gt;scoped_ptr class template&lt;/a&gt;  &amp;#x7684;&amp;#x90E8;&amp;#x5206;&amp;#x4E2D;&amp;#x6587;&amp;#x7FFB;&amp;#x8BD1;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;

    </summary>

      <category term="Unix/Linux" scheme="http://deyituo.github.io/categories/Unix-Linux/"/>


      <category term="shared_ptr" scheme="http://deyituo.github.io/tags/shared-ptr/"/>

      <category term="C++" scheme="http://deyituo.github.io/tags/C/"/>

      <category term="boost" scheme="http://deyituo.github.io/tags/boost/"/>

  </entry>

  <entry>
    <title>shared_ptr类模版(2)</title>
    <link href="http://deyituo.github.io/2016/06/12/shared-ptr%E7%B1%BB%E6%A8%A1%E7%89%88-2/"/>
    <id>http://deyituo.github.io/2016/06/12/shared-ptr类模版-2/</id>
    <published>2016-06-12T02:09:09.000Z</published>
    <updated>2016-06-14T02:08:22.000Z</updated>

    <content type="html">&lt;blockquote&gt;
&lt;p&gt;&amp;#x6700;&amp;#x8FD1;&amp;#x5728;&amp;#x770B;&amp;#x9648;&amp;#x7855;&amp;#x7684;&amp;#x300A;Linux&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x670D;&amp;#x52A1;&amp;#x7AEF;&amp;#x7F16;&amp;#x7A0B;&amp;#xFF1A;&amp;#x4F7F;&amp;#x7528;muduo C++&amp;#x7F51;&amp;#x7EDC;&amp;#x5E93;&amp;#x300B;&amp;#xFF0C;&amp;#x7B2C;&amp;#x4E00;&amp;#x7AE0;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x8BB2;&amp;#x4E86;&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x4E0B;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5904;&amp;#x7406;&amp;#x95EE;&amp;#x9898;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x662F; shared_ptr &amp;#x4E0E; weak_ptr, &amp;#x4E0A;&amp;#x4E24;&amp;#x7BC7;&amp;#x5B66;&amp;#x4E60;&amp;#x4E86; shared_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/09/shared-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;shared_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; ) &amp;#x548C; weak_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/11/weak-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;waek_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; ) &amp;#xFF0C;&amp;#x4ECA;&amp;#x5929;&amp;#x7EE7;&amp;#x7EED;&amp;#x5B66;&amp;#x4E60; shared_ptr &amp;#xFF0C;&amp;#x4EE5;&amp;#x4E0B;&amp;#x662F;&amp;#x5BF9; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/sp_techniques.html&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;Smart Pointer Programming Techniques&lt;/a&gt;  &amp;#x7684;&amp;#x90E8;&amp;#x5206;&amp;#x4E2D;&amp;#x6587;&amp;#x7FFB;&amp;#x8BD1;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;a id=&quot;more&quot;&gt;&lt;/a&gt;
&lt;h2 id=&quot;Using-incomplete-classes-for-implementation-hiding&quot;&gt;&lt;a href=&quot;#Using-incomplete-classes-for-implementation-hiding&quot; class=&quot;headerlink&quot; title=&quot;Using incomplete classes for implementation hiding&quot;&gt;&lt;/a&gt;Using incomplete classes for implementation hiding&lt;/h2&gt;&lt;p&gt;&amp;#x5206;&amp;#x79BB;&amp;#x63A5;&amp;#x53E3;&amp;#x4E0E;&amp;#x5B9E;&amp;#x73B0;&amp;#x7684;&amp;#x4E00;&amp;#x4E2A;&amp;#x6709;&amp;#x6548;&amp;#x65B9;&amp;#x5F0F;&amp;#x662F;&amp;#x4F7F;&amp;#x7528;&amp;#x4E0D;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x7C7B;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x3002;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; FILE;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;FILE * &lt;span class=&quot;title&quot;&gt;fopen&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * name, &lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * mode)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;fread&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(FILE * f, &lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; * data, &lt;span class=&quot;keyword&quot;&gt;size_t&lt;/span&gt; size)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;fclose&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(FILE * f)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x53EF;&amp;#x4EE5;&amp;#x4F7F;&amp;#x7528; shared_ptr &amp;#x6765;&amp;#x8868;&amp;#x8FBE;&amp;#x4E0A;&amp;#x9762;&amp;#x7684;&amp;#x63A5;&amp;#x53E3;&amp;#xFF0C;&amp;#x4F7F;&amp;#x5F97;&amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x624B;&amp;#x52A8;&amp;#x8C03;&amp;#x7528; fclose&amp;#x3002;&lt;/p&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; FILE;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;FILE&amp;gt; fopen(&lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * name, &lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * mode);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;fread&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;FILE&amp;gt; f, &lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; * data, &lt;span class=&quot;keyword&quot;&gt;size_t&lt;/span&gt; size)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x8FD9;&amp;#x79CD;&amp;#x65B9;&amp;#x5F0F;&amp;#x662F;&amp;#x5229;&amp;#x7528;&amp;#x4E86; shared_ptr &amp;#x80FD;&amp;#x591F;&amp;#x81EA;&amp;#x52A8;&amp;#x8C03;&amp;#x7528; deleter &amp;#x7684;&amp;#x673A;&amp;#x5236;&amp;#x6765;&amp;#x53BB;&amp;#x9664;&amp;#x4E86; fclose &amp;#x7684;&amp;#x663E;&amp;#x793A;&amp;#x8C03;&amp;#x7528;&amp;#xFF0C;&amp;#x5B9E;&amp;#x9645;&amp;#x4E0A;&amp;#xFF0C;&amp;#x5F53; X &amp;#x662F;&amp;#x4E0D;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x65F6;&amp;#xFF0C;shared_ptr&amp;lt; X &amp;gt; &amp;#x80FD;&amp;#x591F;&amp;#x88AB;&amp;#x62F7;&amp;#x8D1D;&amp;#x548C;&amp;#x9500;&amp;#x6BC1;&amp;#x3002;&lt;/p&gt;
&lt;h2 id=&quot;The-&amp;#x201C;Pimpl&amp;#x201D;-idiom&quot;&gt;&lt;a href=&quot;#The-&amp;#x201C;Pimpl&amp;#x201D;-idiom&quot; class=&quot;headerlink&quot; title=&quot;The &amp;#x201C;Pimpl&amp;#x201D; idiom&quot;&gt;&lt;/a&gt;The &amp;#x201C;Pimpl&amp;#x201D; idiom&lt;/h2&gt;&lt;p&gt;&amp;#x4E0D;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x7684;&amp;#x4E00;&amp;#x4E2A; C++ &amp;#x53D8;&amp;#x79CD;&amp;#x662F; &amp;#x201C;Pimpl&amp;#x201D; idiom&amp;#xFF0C;&amp;#x4E0D;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x6CA1;&amp;#x6709;&amp;#x66B4;&amp;#x9732;&amp;#x4E8E;&amp;#x7528;&amp;#x6237;&amp;#xFF0C;shared_ptr &amp;#x80FD;&amp;#x591F;&amp;#x7528;&amp;#x6765;&amp;#x5B9E;&amp;#x73B0;&amp;#x4E00;&amp;#x4E2A; &amp;#x201C;Pimpl&amp;#x201D;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// file.hpp:&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; file&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;private&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; impl;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;impl&amp;gt; pimpl_;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    file(&lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * name, &lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * mode);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;comment&quot;&gt;// compiler generated members are fine and useful&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;read&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; * data, &lt;span class=&quot;keyword&quot;&gt;size_t&lt;/span&gt; size)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;25&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;26&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;27&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;28&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// file.cpp:&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;string&quot;&gt;&amp;quot;file.hpp&amp;quot;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; file::impl&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;private&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    impl(impl &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp;);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    impl &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(impl &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp;);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;comment&quot;&gt;// private data&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    impl(&lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * name, &lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * mode) { ... }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    ~impl() { ... }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;read&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; * data, &lt;span class=&quot;keyword&quot;&gt;size_t&lt;/span&gt; size)&lt;/span&gt; &lt;/span&gt;{ ... }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;file::file(&lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * name, &lt;span class=&quot;keyword&quot;&gt;char&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; * mode): pimpl_(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; impl(name, mode))&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; file::read(&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; * data, &lt;span class=&quot;keyword&quot;&gt;size_t&lt;/span&gt; size)&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    pimpl_-&amp;gt;read(data, size);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x8FD9;&amp;#x91CC;&amp;#x7684;&amp;#x5173;&amp;#x952E;&amp;#x70B9;&amp;#x662F;&amp;#x7F16;&amp;#x8BD1;&amp;#x5668;&amp;#x4EA7;&amp;#x751F;&amp;#x7684;&amp;#x590D;&amp;#x5236;&amp;#x62F7;&amp;#x8D1D;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;&amp;#x8D4B;&amp;#x503C;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#x90FD;&amp;#x6709;&amp;#x5176;&amp;#x610F;&amp;#x4E49;&amp;#xFF08;&amp;#x4EE3;&amp;#x7801;&amp;#x4E2D;file&amp;#x6CA1;&amp;#x6709;&amp;#x5B9A;&amp;#x4E49;&amp;#xFF09;&amp;#xFF0C;&amp;#x56E0;&amp;#x6B64;&amp;#xFF0C;file &amp;#x662F;&amp;#x53EF;&amp;#x4EE5;&amp;#x62F7;&amp;#x8D1D;&amp;#x590D;&amp;#x5236;&amp;#x548C;&amp;#x8D4B;&amp;#x503C;&amp;#x7684;&amp;#xFF0C;&amp;#x4F7F;&amp;#x5F97;&amp;#x5B83;&amp;#x80FD;&amp;#x591F;&amp;#x7528;&amp;#x5728;&amp;#x6807;&amp;#x51C6;&amp;#x5BB9;&amp;#x5668;&amp;#x91CC;&amp;#x3002;&lt;/p&gt;
&lt;h2 id=&quot;Using-abstract-classes-for-implementation-hiding&quot;&gt;&lt;a href=&quot;#Using-abstract-classes-for-implementation-hiding&quot; class=&quot;headerlink&quot; title=&quot;Using abstract classes for implementation hiding&quot;&gt;&lt;/a&gt;Using abstract classes for implementation hiding&lt;/h2&gt;&lt;p&gt;&amp;#x53E6;&amp;#x5916;&amp;#x4E00;&amp;#x4E2A;&amp;#x5728; C++ &amp;#x4E2D;&amp;#x5206;&amp;#x79BB;&amp;#x63A5;&amp;#x53E3;&amp;#x4E0E;&amp;#x5B9E;&amp;#x73B0;&amp;#x7684;&amp;#x65B9;&amp;#x5F0F;&amp;#x662F;&amp;#x4F7F;&amp;#x7528; &lt;strong&gt;&amp;#x865A;&amp;#x57FA;&amp;#x7C7B;&lt;/strong&gt; &amp;#x548C; &lt;strong&gt;&amp;#x5DE5;&amp;#x5382;&amp;#x51FD;&amp;#x6570;&lt;/strong&gt;&amp;#xFF0C;&amp;#x865A;&amp;#x7C7B;&amp;#x6709;&amp;#x65F6;&amp;#x5019;&amp;#x88AB;&amp;#x79F0;&amp;#x4E3A;&amp;#x63A5;&amp;#x53E3;&amp;#xFF0C;&amp;#x8FD9;&amp;#x79CD;&amp;#x6A21;&amp;#x5F0F;&amp;#x88AB;&amp;#x79F0;&amp;#x4E3A;&amp;#x57FA;&amp;#x4E8E;&amp;#x63A5;&amp;#x53E3;&amp;#x7F16;&amp;#x7A0B; (&amp;#x201C;interface-based programming&amp;#x201D; )&amp;#xFF0C;&amp;#x8FD9;&amp;#x65F6;&amp;#xFF0C;shared_ptr &amp;#x53EF;&amp;#x4EE5;&amp;#x4F5C;&amp;#x4E3A;&amp;#x5DE5;&amp;#x5382;&amp;#x51FD;&amp;#x6570;&amp;#x7684;&amp;#x8FD4;&amp;#x56DE;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// X.hpp:&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; X&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;virtual&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;f&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;/span&gt;= &lt;span class=&quot;number&quot;&gt;0&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;virtual&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;g&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;/span&gt;= &lt;span class=&quot;number&quot;&gt;0&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;protected&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    ~X() {}&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; createX();&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x7559;&amp;#x610F; X_impl &amp;#x653E;&amp;#x5728;&amp;#x4E86; cpp &amp;#x4E2D;&amp;#x58F0;&amp;#x660E;&amp;#x548C;&amp;#x5B9A;&amp;#x4E49;&amp;#x3002;&lt;/p&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;25&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;26&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;27&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//X.cpp:&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; X_impl: &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt; X&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;private&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    X_impl(X_impl &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp;);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    X_impl &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(X_impl &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp;);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;virtual&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;f&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;/span&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;comment&quot;&gt;// ...&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;virtual&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;g&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;/span&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;comment&quot;&gt;// ...&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; createX()&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; px(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; X_impl);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;return&lt;/span&gt; px;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;shared_ptr &amp;#x7684;&amp;#x4E00;&amp;#x4E2A;&amp;#x5173;&amp;#x952E;&amp;#x5C5E;&amp;#x6027;&amp;#x662F;&amp;#x5206;&amp;#x914D;&amp;#x5185;&amp;#x5B58;&amp;#xFF0C;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;&amp;#x91CA;&amp;#x653E;&amp;#x5185;&amp;#x5B58;&amp;#xFF0C;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#x7684;&amp;#x7EC6;&amp;#x8282;&amp;#x662F;&amp;#x5728;&amp;#x5DE5;&amp;#x5382;&amp;#x51FD;&amp;#x6570;&amp;#x7684;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x91CC;&amp;#x9762;&amp;#x5F00;&amp;#x59CB;&amp;#x7684;&amp;#x3002;&amp;#x7559;&amp;#x610F;&amp;#x4F8B;&amp;#x5B50;&amp;#x4E2D;&amp;#x7684;&amp;#x88AB;&amp;#x4FDD;&amp;#x62A4;&amp;#x7684;&amp;#x975E;&amp;#x865A;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#xFF08;&amp;#x865A;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#x53EF;&amp;#x4EE5;&amp;#x786E;&amp;#x4FDD;&amp;#x7A0B;&amp;#x5E8F;&amp;#x6B63;&amp;#x786E;&amp;#x8C03;&amp;#x7528;&amp;#x6307;&amp;#x9488;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;&amp;#x5982;&amp;#x679C;&amp;#x6CA1;&amp;#x6709; virtual &amp;#x5173;&amp;#x952E;&amp;#x5B57;&amp;#xFF0C;&amp;#x5219;&amp;#x7531;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x7C7B;&amp;#x578B;&amp;#x51B3;&amp;#x5B9A;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#xFF09;&amp;#xFF0C;&amp;#x5BA2;&amp;#x6237;&amp;#x4EE3;&amp;#x7801;&amp;#x4E0D;&amp;#x80FD;&amp;#x591F;&amp;#xFF08;&amp;#x4E5F;&amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#xFF09;&amp;#x5220;&amp;#x9664;&amp;#x6307;&amp;#x5411; X &amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF1B;createX &amp;#x8FD4;&amp;#x56DE;&amp;#x7684; shared_ptr&amp;lt; X &amp;gt; &amp;#x80FD;&amp;#x591F;&amp;#x6B63;&amp;#x786E;&amp;#x5730;&amp;#x8C03;&amp;#x7528; &amp;#xFF5E;X_impl&amp;#x3002;&lt;/p&gt;
&lt;h2 id=&quot;Preventing-delete-px-get&quot;&gt;&lt;a href=&quot;#Preventing-delete-px-get&quot; class=&quot;headerlink&quot; title=&quot;Preventing delete px.get()&quot;&gt;&lt;/a&gt;Preventing delete px.get()&lt;/h2&gt;&lt;p&gt;&amp;#x963B;&amp;#x6B62;&amp;#x5BA2;&amp;#x6237;&amp;#x4EE3;&amp;#x7801;&amp;#x8BD5;&amp;#x56FE;&amp;#x5220;&amp;#x9664;&amp;#x4E00;&amp;#x4E2A;&amp;#x88AB; shared_ptr &amp;#x7BA1;&amp;#x7406;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x662F;&amp;#x7ECF;&amp;#x5E38;&amp;#x9700;&amp;#x8981;&amp;#x7684;&amp;#xFF0C;&amp;#x524D;&amp;#x9762;&amp;#x7684;&amp;#x6280;&amp;#x672F;&amp;#x4E2D;&amp;#x5C55;&amp;#x793A;&amp;#x4E86;&amp;#x5176;&amp;#x4E2D;&amp;#x4E00;&amp;#x4E2A;&amp;#x529E;&amp;#x6CD5;&amp;#xFF0C;&amp;#x4F7F;&amp;#x7528; protected &amp;#x7684;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;&amp;#x53E6;&amp;#x5916;&amp;#x4E00;&amp;#x4E2A;&amp;#x65B9;&amp;#x6CD5;&amp;#x662F;&amp;#x4F7F;&amp;#x7528;&amp;#x79C1;&amp;#x6709;&amp;#x7684; deleter&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; X&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;private&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    ~X();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; deleter;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;friend&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; deleter;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; deleter&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    {&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;        &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;operator&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(X * p)&lt;/span&gt; &lt;/span&gt;{ &lt;span class=&quot;keyword&quot;&gt;delete&lt;/span&gt; p; }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    };&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;static&lt;/span&gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; create()&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    {&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;        &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; px(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; X, X::deleter());&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;        &lt;span class=&quot;keyword&quot;&gt;return&lt;/span&gt; px;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;h2 id=&quot;Using-a-shared-ptr-to-hold-a-pointer-to-an-array&quot;&gt;&lt;a href=&quot;#Using-a-shared-ptr-to-hold-a-pointer-to-an-array&quot; class=&quot;headerlink&quot; title=&quot;Using a shared_ptr to hold a pointer to an array&quot;&gt;&lt;/a&gt;Using a shared_ptr to hold a pointer to an array&lt;/h2&gt;&lt;p&gt;shared_ptr &amp;#x80FD;&amp;#x591F;&amp;#x7528;&amp;#x6765;&amp;#x4FDD;&amp;#x5B58; new[] &amp;#x64CD;&amp;#x4F5C;&amp;#x51FA;&amp;#x6765;&amp;#x7684;&amp;#x6570;&amp;#x7EC4;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; px(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; X[&lt;span class=&quot;number&quot;&gt;1&lt;/span&gt;], checked_array_deleter&amp;lt;X&amp;gt;());&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x6CE8;&amp;#x610F;&amp;#xFF0C;&amp;#x5982;&amp;#x679C;&amp;#x6709;&amp;#x5F97;&amp;#x9009;&amp;#x62E9;&amp;#xFF0C;&lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/shared_array.htm&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;shared_array&lt;/a&gt; &amp;#x66F4;&amp;#x7ECF;&amp;#x5E38;&amp;#x9002;&amp;#x5408;&amp;#x8FD9;&amp;#x4E2A;&amp;#x4EFB;&amp;#x52A1;&amp;#xFF0C;&amp;#x5B83;&amp;#x6709;&amp;#x4E00;&amp;#x4E2A;&amp;#x4E13;&amp;#x95E8;&amp;#x4E3A;&amp;#x6570;&amp;#x7EC4;&amp;#x8BBE;&amp;#x8BA1;&amp;#x7684;&amp;#x63A5;&amp;#x53E3;&amp;#xFF0C;&amp;#x4E0D;&amp;#x9700;&amp;#x8981; operator* &amp;#x4E0E; operator-&amp;gt;&amp;#xFF0C;&amp;#x5E76;&amp;#x4E14;&amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x8F6C;&amp;#x5316;&amp;#x3002;(?)&lt;/p&gt;
&lt;h2 id=&quot;Encapsulating-allocation-details-wrapping-factory-functions&quot;&gt;&lt;a href=&quot;#Encapsulating-allocation-details-wrapping-factory-functions&quot; class=&quot;headerlink&quot; title=&quot;Encapsulating allocation details, wrapping factory functions&quot;&gt;&lt;/a&gt;Encapsulating allocation details, wrapping factory functions&lt;/h2&gt;&lt;p&gt;shared_ptr &amp;#x80FD;&amp;#x591F;&amp;#x7528;&amp;#x6765;&amp;#x521B;&amp;#x5EFA; C++ &amp;#x7684; wrappers &amp;#x6765;&amp;#x9002;&amp;#x5E94;&amp;#x73B0;&amp;#x6709; C &amp;#x98CE;&amp;#x683C;&amp;#x7684;&amp;#x5E93;&amp;#x63A5;&amp;#x53E3;&amp;#xFF08;&amp;#x5E93;&amp;#x63A5;&amp;#x53E3;&amp;#x4E2D;&amp;#x5DE5;&amp;#x5382;&amp;#x51FD;&amp;#x6570;&amp;#x8FD4;&amp;#x56DE;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF09;&amp;#xFF0C;&amp;#x4ECE;&amp;#x800C;&amp;#x5C01;&amp;#x88C5;&amp;#x5185;&amp;#x5B58;&amp;#x5206;&amp;#x914D;&amp;#x7684;&amp;#x7EC6;&amp;#x8282;&amp;#x3002;&amp;#x8003;&amp;#x8651;&amp;#x4E0B;&amp;#x9762;&amp;#x8FD9;&amp;#x4E2A;&amp;#x63A5;&amp;#x53E3;&amp;#xFF0C;CreateX &amp;#x53EF;&amp;#x80FD;&amp;#x4ECE;&amp;#x5B83;&amp;#x7684;&amp;#x79C1;&amp;#x6709;&amp;#x5806;&amp;#x91CC;&amp;#x5206;&amp;#x914D;&amp;#x5185;&amp;#x5B58;&amp;#x7ED9; X&amp;#xFF0C; &amp;#xFF5E;X &amp;#x53EF;&amp;#x80FD;&amp;#x65E0;&amp;#x6CD5;&amp;#x8BBF;&amp;#x95EE;&amp;#xFF0C;&amp;#x6216;&amp;#x8005; X &amp;#x53EF;&amp;#x80FD;&amp;#x4E0D;&amp;#x662F;&amp;#x5B8C;&amp;#x6574;&amp;#x7684;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;X * &lt;span class=&quot;title&quot;&gt;CreateX&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;DestroyX&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(X *)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;``` &lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&amp;#x9500;&amp;#x6BC1; CreateX &amp;#x8FD4;&amp;#x56DE;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x552F;&amp;#x4E00;&amp;#x65B9;&amp;#x6CD5;&amp;#x662F;&amp;#x8C03;&amp;#x7528; DestroyX &amp;#x51FD;&amp;#x6570;&amp;#x3002;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;#x7684; wrapper &amp;#x53EF;&amp;#x80FD;&amp;#x5982;&amp;#x4E0B;&amp;#xFF1A;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;```C++&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; createX()&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; px(CreateX(), DestroyX);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;return&lt;/span&gt; px;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x5BA2;&amp;#x6237;&amp;#x7AEF;&amp;#x4EE3;&amp;#x7801;&amp;#x8C03;&amp;#x7528; createX &amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x77E5;&amp;#x9053;&amp;#x5BF9;&amp;#x8C61;&amp;#x662F;&amp;#x5982;&amp;#x4F55;&amp;#x88AB;&amp;#x5206;&amp;#x914D;&amp;#x5185;&amp;#x5B58;&amp;#x7684;&amp;#xFF0C;&amp;#x6790;&amp;#x6784;&amp;#x4E5F;&amp;#x662F;&amp;#x81EA;&amp;#x52A8;&amp;#x7684;&amp;#x3002;&lt;/p&gt;
&lt;h2 id=&quot;Using-a-shared-ptr-to-hold-a-pointer-to-a-statically-allocated-object&quot;&gt;&lt;a href=&quot;#Using-a-shared-ptr-to-hold-a-pointer-to-a-statically-allocated-object&quot; class=&quot;headerlink&quot; title=&quot;Using a shared_ptr to hold a pointer to a statically allocated object&quot;&gt;&lt;/a&gt;Using a shared_ptr to hold a pointer to a statically allocated object&lt;/h2&gt;&lt;p&gt;&amp;#x6709;&amp;#x65F6;&amp;#x7ED9;&amp;#x4E00;&amp;#x4E2A;&amp;#x5DF2;&amp;#x7ECF;&amp;#x5B58;&amp;#x5728;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x521B;&amp;#x5EFA;&amp;#x4E00;&amp;#x4E2A; shared_ptr &amp;#xFF0C;&amp;#x56E0;&amp;#x6B64;&amp;#xFF0C;&amp;#x5F53;&amp;#x6CA1;&amp;#x6709;&amp;#x66F4;&amp;#x591A;&amp;#x5F15;&amp;#x7528;&amp;#x5269;&amp;#x4E0B;&amp;#x65F6;&amp;#xFF0C;shared_ptr &amp;#x4E0D;&amp;#x8BD5;&amp;#x56FE;&amp;#x53BB;&amp;#x9500;&amp;#x6BC1;&amp;#x8FD9;&amp;#x4E2A;&amp;#x5BF9;&amp;#x8C61;&amp;#xFF0C;&amp;#x5982;&amp;#x4E0B;&amp;#x5DE5;&amp;#x5382;&amp;#x51FD;&amp;#x6570;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; createX();&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x6709;&amp;#x4E9B;&amp;#x65F6;&amp;#x5019;&amp;#x9700;&amp;#x8981;&amp;#x8FD4;&amp;#x56DE;&amp;#x9759;&amp;#x6001;&amp;#x5206;&amp;#x914D; X &amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&amp;#x89E3;&amp;#x51B3;&amp;#x65B9;&amp;#x6CD5;&amp;#x662F;&amp;#x4F7F;&amp;#x7528;&amp;#x81EA;&amp;#x5B9A;&amp;#x4E49;&amp;#x7684; deleter &amp;#x4E0D;&amp;#x505A;&amp;#x4EFB;&amp;#x4F55;&amp;#x4E1C;&amp;#x897F;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;struct&lt;/span&gt; null_deleter&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;operator&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; *)&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;/span&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;static&lt;/span&gt; X x;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; createX()&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;X&amp;gt; px(&amp;amp;x, null_deleter());&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;return&lt;/span&gt; px;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
</content>

    <summary type="html">

      &lt;blockquote&gt;
&lt;p&gt;&amp;#x6700;&amp;#x8FD1;&amp;#x5728;&amp;#x770B;&amp;#x9648;&amp;#x7855;&amp;#x7684;&amp;#x300A;Linux&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x670D;&amp;#x52A1;&amp;#x7AEF;&amp;#x7F16;&amp;#x7A0B;&amp;#xFF1A;&amp;#x4F7F;&amp;#x7528;muduo C++&amp;#x7F51;&amp;#x7EDC;&amp;#x5E93;&amp;#x300B;&amp;#xFF0C;&amp;#x7B2C;&amp;#x4E00;&amp;#x7AE0;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x8BB2;&amp;#x4E86;&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x4E0B;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5904;&amp;#x7406;&amp;#x95EE;&amp;#x9898;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x662F; shared_ptr &amp;#x4E0E; weak_ptr, &amp;#x4E0A;&amp;#x4E24;&amp;#x7BC7;&amp;#x5B66;&amp;#x4E60;&amp;#x4E86; shared_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/09/shared-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;shared_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; ) &amp;#x548C; weak_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/11/weak-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;waek_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; ) &amp;#xFF0C;&amp;#x4ECA;&amp;#x5929;&amp;#x7EE7;&amp;#x7EED;&amp;#x5B66;&amp;#x4E60; shared_ptr &amp;#xFF0C;&amp;#x4EE5;&amp;#x4E0B;&amp;#x662F;&amp;#x5BF9; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/sp_techniques.html&quot;&gt;Smart Pointer Programming Techniques&lt;/a&gt;  &amp;#x7684;&amp;#x90E8;&amp;#x5206;&amp;#x4E2D;&amp;#x6587;&amp;#x7FFB;&amp;#x8BD1;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;

    </summary>

      <category term="Unix/Linux" scheme="http://deyituo.github.io/categories/Unix-Linux/"/>


      <category term="shared_ptr" scheme="http://deyituo.github.io/tags/shared-ptr/"/>

      <category term="C++" scheme="http://deyituo.github.io/tags/C/"/>

      <category term="boost" scheme="http://deyituo.github.io/tags/boost/"/>

  </entry>

  <entry>
    <title>weak_ptr类模版</title>
    <link href="http://deyituo.github.io/2016/06/11/weak-ptr%E7%B1%BB%E6%A8%A1%E7%89%88/"/>
    <id>http://deyituo.github.io/2016/06/11/weak-ptr类模版/</id>
    <published>2016-06-11T09:33:55.000Z</published>
    <updated>2016-06-12T01:18:46.000Z</updated>

    <content type="html">&lt;blockquote&gt;
&lt;p&gt;&amp;#x6700;&amp;#x8FD1;&amp;#x5728;&amp;#x770B;&amp;#x9648;&amp;#x7855;&amp;#x7684;&amp;#x300A;Linux&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x670D;&amp;#x52A1;&amp;#x7AEF;&amp;#x7F16;&amp;#x7A0B;&amp;#xFF1A;&amp;#x4F7F;&amp;#x7528;muduo C++&amp;#x7F51;&amp;#x7EDC;&amp;#x5E93;&amp;#x300B;&amp;#xFF0C;&amp;#x7B2C;&amp;#x4E00;&amp;#x7AE0;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x8BB2;&amp;#x4E86;&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x4E0B;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5904;&amp;#x7406;&amp;#x95EE;&amp;#x9898;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x662F; shared_ptr &amp;#x4E0E; weak_ptr, &amp;#x4E0A;&amp;#x4E00;&amp;#x7BC7;&amp;#x535A;&amp;#x5BA2;&amp;#x5B66;&amp;#x4E60;&amp;#x4E86; shared_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/09/shared-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;shared_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; )&amp;#xFF0C;&amp;#x4ECA;&amp;#x5929;&amp;#x7EE7;&amp;#x7EED;&amp;#x5B66;&amp;#x4E60; weak_ptr &amp;#xFF0C;&amp;#x4EE5;&amp;#x4E0B;&amp;#x662F;&amp;#x5BF9; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/weak_ptr.htm&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;boost::weak_ptr&lt;/a&gt;  &amp;#x7684;&amp;#x4E2D;&amp;#x6587;&amp;#x7FFB;&amp;#x8BD1;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;a id=&quot;more&quot;&gt;&lt;/a&gt;
&lt;h2 id=&quot;Introduction&quot;&gt;&lt;a href=&quot;#Introduction&quot; class=&quot;headerlink&quot; title=&quot;Introduction&quot;&gt;&lt;/a&gt;Introduction&lt;/h2&gt;&lt;h3 id=&quot;weak-ptr-&amp;#x8F6C;&amp;#x5316;&amp;#x5230;-shared-ptr&quot;&gt;&lt;a href=&quot;#weak-ptr-&amp;#x8F6C;&amp;#x5316;&amp;#x5230;-shared-ptr&quot; class=&quot;headerlink&quot; title=&quot;weak_ptr &amp;#x8F6C;&amp;#x5316;&amp;#x5230; shared_ptr&quot;&gt;&lt;/a&gt;weak_ptr &amp;#x8F6C;&amp;#x5316;&amp;#x5230; shared_ptr&lt;/h3&gt;&lt;p&gt;weak_ptr &amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&amp;#x5B58;&amp;#x50A8;&amp;#x4E86;&amp;#x88AB; shared_ptr &amp;#x7BA1;&amp;#x7406;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x201C;&amp;#x5F31;&amp;#x5F15;&amp;#x7528;&amp;#x201D;&amp;#xFF0C;weak_ptr &amp;#x80FD;&amp;#x901A;&amp;#x8FC7;&amp;#x4F7F;&amp;#x7528; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/shared_ptr.htm#constructors&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;shared_ptr &amp;#x7684;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/a&gt; &amp;#x6216;&amp;#x8005;&amp;#x6210;&amp;#x5458;&amp;#x51FD;&amp;#x6570; &amp;#x8F6C;&amp;#x5316;&amp;#x5230; shared_ptr&amp;#x3002;&amp;#x5F53;&amp;#x6700;&amp;#x540E;&amp;#x4E00;&amp;#x4E2A;&amp;#x6307;&amp;#x5411;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684; shared_ptr &amp;#x88AB;&amp;#x9500;&amp;#x6BC1;&amp;#xFF0C;&amp;#x5BF9;&amp;#x8C61;&amp;#x4F1A;&amp;#x88AB;&amp;#x9500;&amp;#x6BC1;&amp;#x3002;weak_ptr &amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x88AB;&amp;#x9500;&amp;#x6BC1;&amp;#x540E;&amp;#xFF0C;&amp;#x8BD5;&amp;#x56FE;&amp;#x4ECE; weak_ptr &amp;#x83B7;&amp;#x5F97; shared_ptr &amp;#x5C06;&amp;#x5931;&amp;#x8D25;&amp;#xFF0C;&amp;#x5E76;&amp;#x4E14;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x4F1A;&amp;#x629B;&amp;#x51FA;&amp;#x4E00;&amp;#x4E2A;&amp;#x7C7B;&amp;#x578B;&amp;#x4E3A; boost::bad_weak_ptr &amp;#x7684;&amp;#x5F02;&amp;#x5E38;&amp;#xFF0C;weak_ptr::lock &amp;#x5C06;&amp;#x8FD4;&amp;#x56DE;&amp;#x4E00;&amp;#x4E2A;&amp;#x7A7A;&amp;#x7684; shared_ptr&amp;#x3002;&amp;#xFF08;&amp;#xFF1F;&amp;#xFF09;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&quot;&gt;&lt;a href=&quot;#&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&quot;&gt;&lt;/a&gt;&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&lt;/h3&gt;&lt;p&gt;&amp;#x6BCF;&amp;#x4E00;&amp;#x4E2A; weak_ptr &amp;#x90FD;&amp;#x80FD;&amp;#x62F7;&amp;#x8D1D;&amp;#x6784;&amp;#x9020;&amp;#x548C;&amp;#x8D4B;&amp;#x503C;&amp;#xFF0C;&amp;#x56E0;&amp;#x800C;&amp;#x80FD;&amp;#x7528;&amp;#x4E8E;&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&amp;#x5BB9;&amp;#x5668;&amp;#x3002;&amp;#x53E6;&amp;#x5916;&amp;#xFF0C;&amp;#x8FD8;&amp;#x6709;&amp;#x5BF9;&amp;#x6BD4;&amp;#x64CD;&amp;#x4F5C;&amp;#x7B26;&amp;#xFF0C;&amp;#x4F7F;&amp;#x5F97; weak_ptr &amp;#x80FD;&amp;#x7528;&amp;#x4E8E;&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&amp;#x7684;&amp;#x5173;&amp;#x8054;&amp;#x5BB9;&amp;#x5668;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x64CD;&amp;#x4F5C;&quot;&gt;&lt;a href=&quot;#&amp;#x64CD;&amp;#x4F5C;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x64CD;&amp;#x4F5C;&quot;&gt;&lt;/a&gt;&amp;#x64CD;&amp;#x4F5C;&lt;/h3&gt;&lt;p&gt;weak_ptr &amp;#x64CD;&amp;#x4F5C;&amp;#x7B26;&amp;#x4E0D;&amp;#x629B;&amp;#x51FA;&amp;#x5F02;&amp;#x5E38;&amp;#x3002;&lt;/p&gt;
&lt;p&gt;&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&amp;#x4F7F;&amp;#x7528; T &amp;#x4F5C;&amp;#x4E3A;&amp;#x53C2;&amp;#x6570;&amp;#xFF0C;T &amp;#x4E3A;&amp;#x6307;&amp;#x5411;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&lt;/p&gt;
&lt;p&gt;&amp;#x4E0E; shared_ptr &amp;#x5BF9;&amp;#x6BD4;&amp;#xFF0C;weak_ptr &amp;#x63D0;&amp;#x4F9B;&amp;#x4E86;&amp;#x975E;&amp;#x5E38;&amp;#x6709;&amp;#x9650;&amp;#x7684;&amp;#x90E8;&amp;#x5206;&amp;#x64CD;&amp;#x4F5C;&amp;#xFF0C;&amp;#x56E0;&amp;#x4E3A;&amp;#x5728;&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x7A0B;&amp;#x5E8F;&amp;#x91CC;&amp;#x4F7F;&amp;#x7528;&amp;#x5B83;&amp;#x5B58;&amp;#x50A8;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x5F0F;&amp;#x901A;&amp;#x5E38;&amp;#x662F;&amp;#x5371;&amp;#x9669;&amp;#x7684;&amp;#xFF0C;&amp;#x751A;&amp;#x81F3;&amp;#x5728;&amp;#x5355;&amp;#x7EBF;&amp;#x7A0B;&amp;#x4E2D;&amp;#x6709;&amp;#x65F6;&amp;#x4E5F;&amp;#x4E0D;&amp;#x5B89;&amp;#x5168;&amp;#xFF08;&amp;#x4E5F;&amp;#x5C31;&amp;#x662F;&amp;#x8BF4;&amp;#xFF0C;&amp;#x5B83;&amp;#x4F1A;&amp;#x5F15;&amp;#x8D77;&amp;#x65E0;&amp;#x5B9A;&amp;#x4E49;&amp;#x7684;&amp;#x884C;&amp;#x4E3A;&amp;#xFF09;&amp;#x3002;&amp;#x5047;&amp;#x8BBE; weak_ptr &amp;#x62E5;&amp;#x6709;&amp;#x4E00;&amp;#x4E2A; get &amp;#x51FD;&amp;#x6570;&amp;#x80FD;&amp;#x591F;&amp;#x8FD4;&amp;#x56DE;&amp;#x5BF9;&amp;#x8C61;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&amp;#x5982;&amp;#x4E0B;&amp;#x9762;&amp;#x9519;&amp;#x8BEF;&amp;#x7684;&amp;#x4EE3;&amp;#x7801;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;&amp;gt; p(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;(&lt;span class=&quot;number&quot;&gt;5&lt;/span&gt;));&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;weak_ptr&amp;lt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;&amp;gt; q(p);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// some time later&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;if&lt;/span&gt;(&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt; * r = q.get())&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;comment&quot;&gt;// use *r&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x60F3;&amp;#x8C61;&amp;#x5982;&amp;#x679C;&amp;#x5728; if &amp;#x540E;&amp;#xFF0C;&amp;#x5728; r &amp;#x88AB;&amp;#x4F7F;&amp;#x7528;&amp;#x524D;&amp;#xFF0C;&amp;#x53E6;&amp;#x5916;&amp;#x4E00;&amp;#x4E2A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x8FD0;&amp;#x884C;&amp;#x5230;&amp;#x4E86;&amp;#x8BED;&amp;#x53E5; p.reset()&amp;#xFF0C;&amp;#x90A3;&amp;#x4E48; r &amp;#x73B0;&amp;#x5728;&amp;#x5C31;&amp;#x6210;&amp;#x4E86;&amp;#x7A7A;&amp;#x60AC;&amp;#x6307;&amp;#x9488;&amp;#x3002;&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x7A7A;&amp;#x60AC;&amp;#x6307;&amp;#x9488;(dangling pointer)&amp;#x6307;&amp;#x5411;&amp;#x5DF2;&amp;#x7ECF;&amp;#x9500;&amp;#x6BC1;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x6216;&amp;#x5DF2;&amp;#x7ECF;&amp;#x56DE;&amp;#x6536;&amp;#x7684;&amp;#x5730;&amp;#x5740;,&amp;#x91CE;&amp;#x6307;&amp;#x9488;(wild pointer)&amp;#x6307;&amp;#x7684;&amp;#x662F; &amp;#x672A;&amp;#x7ECF;&amp;#x521D;&amp;#x59CB;&amp;#x5316;&amp;#x7684;&amp;#x6307;&amp;#x9488;(&lt;a href=&quot;http://en.wikipedia.org/wiki/Dangling_pointer)&amp;#x3002;&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;http://en.wikipedia.org/wiki/Dangling_pointer)&amp;#x3002;&lt;/a&gt;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;p&gt;&amp;#x8FD9;&amp;#x4E2A;&amp;#x95EE;&amp;#x9898;&amp;#x7684;&amp;#x89E3;&amp;#x51B3;&amp;#x529E;&amp;#x6CD5;&amp;#x662F;&amp;#x4ECE; q &amp;#x521B;&amp;#x5EFA;&amp;#x4E00;&amp;#x4E2A;&amp;#x4E34;&amp;#x65F6;&amp;#x7684; shared_ptr &amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;&amp;gt; p(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;(&lt;span class=&quot;number&quot;&gt;5&lt;/span&gt;));&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;weak_ptr&amp;lt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;&amp;gt; q(p);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// some time later&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;if&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;&amp;gt; r = q.lock())&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;comment&quot;&gt;// use *r&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x90A3;&amp;#x4E48;&amp;#x73B0;&amp;#x5728; r &amp;#x5C31;&amp;#x6709;&amp;#x4E86;&amp;#x4E00;&amp;#x4E2A; q &amp;#x6307;&amp;#x5411;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x5F15;&amp;#x7528;&amp;#x3002;&amp;#x5373;&amp;#x4F7F; p.reset()&amp;#x5728;&amp;#x53E6;&amp;#x5916;&amp;#x4E00;&amp;#x4E2A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x88AB;&amp;#x6267;&amp;#x884C;&amp;#xFF0C;&amp;#x8FD9;&amp;#x4E2A;&amp;#x5BF9;&amp;#x8C61;&amp;#x4ECD;&amp;#x7136;&amp;#x4F1A;&amp;#x5B58;&amp;#x6D3B;&amp;#xFF0C;&amp;#x76F4;&amp;#x5230; r &amp;#x79BB;&amp;#x5F00;&amp;#x4E86;&amp;#x4F5C;&amp;#x7528;&amp;#x8303;&amp;#x56F4;&amp;#x6216;&amp;#x8005;&amp;#x91CD;&amp;#x65B0;&amp;#x88AB; reset &amp;#x4E86;&amp;#xFF0C;&amp;#x901A;&amp;#x8FC7;&amp;#x83B7;&amp;#x5F97;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684; shared_ptr&amp;#xFF0C;&amp;#x6211;&amp;#x4EEC;&amp;#x80FD;&amp;#x591F;&amp;#x6709;&amp;#x6548;&amp;#x5730;&amp;#x9501;&amp;#x5B9A;&amp;#x5B83;&amp;#x9632;&amp;#x6B62;&amp;#x9500;&amp;#x6BC1;&amp;#x3002; &lt;/p&gt;
&lt;h2 id=&quot;Synopsis&quot;&gt;&lt;a href=&quot;#Synopsis&quot; class=&quot;headerlink&quot; title=&quot;Synopsis&quot;&gt;&lt;/a&gt;Synopsis&lt;/h2&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;25&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;26&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;27&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;28&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;29&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;30&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;31&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;32&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;33&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;namespace&lt;/span&gt; boost {&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; weak_ptr {&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;typedef&lt;/span&gt; T element_type;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      weak_ptr();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; weak_ptr(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      weak_ptr(weak_ptr &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; weak_ptr(weak_ptr&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      ~weak_ptr();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      weak_ptr &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(weak_ptr &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; weak_ptr &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(weak_ptr&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; weak_ptr &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;long&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;use_count&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;expired&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; lock() &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(weak_ptr&amp;lt;T&amp;gt; &amp;amp; b)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  };&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; U&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;&amp;lt;(weak_ptr&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; a, weak_ptr&amp;lt;U&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; b);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(weak_ptr&amp;lt;T&amp;gt; &amp;amp; a, weak_ptr&amp;lt;T&amp;gt; &amp;amp; b)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;h2 id=&quot;Members&quot;&gt;&lt;a href=&quot;#Members&quot; class=&quot;headerlink&quot; title=&quot;Members&quot;&gt;&lt;/a&gt;Members&lt;/h2&gt;&lt;h3 id=&quot;element-type&quot;&gt;&lt;a href=&quot;#element-type&quot; class=&quot;headerlink&quot; title=&quot;element_type&quot;&gt;&lt;/a&gt;element_type&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;typedef&lt;/span&gt; T element_type;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x63D0;&amp;#x4F9B;&amp;#x6A21;&amp;#x7248;&amp;#x53C2;&amp;#x6570; T &amp;#x7684;&amp;#x7C7B;&amp;#x578B;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;weak_ptr();&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x6784;&amp;#x5EFA;&amp;#x4E00;&amp;#x4E2A;&amp;#x7A7A;&amp;#x7684; weak_ptr &amp;#x3002;&lt;br&gt;&amp;#x540E;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;use_count() == 0&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; weak_ptr(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;weak_ptr(weak_ptr &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; weak_ptr(weak_ptr&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x5982;&amp;#x679C; r &amp;#x662F;&amp;#x7A7A;&amp;#x7684;&amp;#xFF0C;&amp;#x6784;&amp;#x9020;&amp;#x4E00;&amp;#x4E2A;&amp;#x7A7A;&amp;#x7684; weak_ptr&amp;#xFF1B;&amp;#x5426;&amp;#x5219;&amp;#xFF0C;&amp;#x6784;&amp;#x9020;&amp;#x4E00;&amp;#x4E2A; weak_ptr &amp;#x4E0E; r &amp;#x5171;&amp;#x4EAB;&amp;#x6240;&amp;#x6709;&amp;#x6743;&amp;#xFF0C;&amp;#x540C;&amp;#x65F6;&amp;#x5B58;&amp;#x50A8;&amp;#x4E00;&amp;#x4EFD; r &amp;#x4E2D;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x62F7;&amp;#x8D1D;&amp;#x3002;&lt;br&gt;&amp;#x540E;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;use_count() == r.use_count()&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;~weak_ptr();&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x9500;&amp;#x6BC1;&amp;#x8FD9;&amp;#x4E2A; weak_ptr&amp;#xFF0C;&amp;#x4F46;&amp;#x662F;&amp;#x5BF9;&amp;#x5B83;&amp;#x4FDD;&amp;#x5B58;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x6307;&amp;#x5411;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x65E0;&amp;#x5F71;&amp;#x54CD;&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;&amp;#x8D4B;&amp;#x503C;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x8D4B;&amp;#x503C;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x8D4B;&amp;#x503C;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x8D4B;&amp;#x503C;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;weak_ptr &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(weak_ptr &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; weak_ptr &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(weak_ptr&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; weak_ptr &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; weak_ptr(r).swap(*this)&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;use-count&quot;&gt;&lt;a href=&quot;#use-count&quot; class=&quot;headerlink&quot; title=&quot;use_count&quot;&gt;&lt;/a&gt;use_count&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;long&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;use_count&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#xFF1A;&amp;#x5982;&amp;#x679C;*this&amp;#x4E3A;&amp;#x7A7A;&amp;#xFF0C;0&amp;#xFF1B;&amp;#x5426;&amp;#x5219;&amp;#xFF0C;&amp;#x4E0E; weak_ptr &amp;#x6240;&amp;#x5171;&amp;#x4EAB;&amp;#x6240;&amp;#x6709;&amp;#x6743;&amp;#x7684; shared_ptr &amp;#x7684;&amp;#x6570;&amp;#x76EE;&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;br&gt;&amp;#x6CE8;&amp;#x610F;&amp;#xFF1A;use_count() &amp;#x4E0D;&amp;#x662F;&amp;#x9AD8;&amp;#x6548;&amp;#x7684;&amp;#xFF0C;&amp;#x53EA;&amp;#x662F;&amp;#x7528;&amp;#x6765;&amp;#x8C03;&amp;#x8BD5;&amp;#x548C;&amp;#x6D4B;&amp;#x8BD5;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;expired&quot;&gt;&lt;a href=&quot;#expired&quot; class=&quot;headerlink&quot; title=&quot;expired&quot;&gt;&lt;/a&gt;expired&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;expired&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#xFF1A;use_count() == 0&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;br&gt;&amp;#x6CE8;&amp;#x610F;&amp;#xFF1A;expired() &amp;#x6BD4; use_count() &amp;#x5FEB;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;lock&quot;&gt;&lt;a href=&quot;#lock&quot; class=&quot;headerlink&quot; title=&quot;lock&quot;&gt;&lt;/a&gt;lock&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; lock() &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#xFF1A;expired() ? shared_ptr&amp;lt; T &amp;gt;() : shared_ptr&amp;lt; T &amp;gt;(*this)&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;reset&quot;&gt;&lt;a href=&quot;#reset&quot; class=&quot;headerlink&quot; title=&quot;reset&quot;&gt;&lt;/a&gt;reset&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x4EF7;&amp;#x4E8E; weak_ptr().swap(*this)&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;swap&quot;&gt;&lt;a href=&quot;#swap&quot; class=&quot;headerlink&quot; title=&quot;swap&quot;&gt;&lt;/a&gt;swap&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(weak_ptr &amp;amp; b)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x4EA4;&amp;#x6362;&amp;#x4E24;&amp;#x4E2A;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5185;&amp;#x5BB9;&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h2 id=&quot;Free-Functions&quot;&gt;&lt;a href=&quot;#Free-Functions&quot; class=&quot;headerlink&quot; title=&quot;Free Functions&quot;&gt;&lt;/a&gt;Free Functions&lt;/h2&gt;</content>

    <summary type="html">

      &lt;blockquote&gt;
&lt;p&gt;&amp;#x6700;&amp;#x8FD1;&amp;#x5728;&amp;#x770B;&amp;#x9648;&amp;#x7855;&amp;#x7684;&amp;#x300A;Linux&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x670D;&amp;#x52A1;&amp;#x7AEF;&amp;#x7F16;&amp;#x7A0B;&amp;#xFF1A;&amp;#x4F7F;&amp;#x7528;muduo C++&amp;#x7F51;&amp;#x7EDC;&amp;#x5E93;&amp;#x300B;&amp;#xFF0C;&amp;#x7B2C;&amp;#x4E00;&amp;#x7AE0;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x8BB2;&amp;#x4E86;&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x4E0B;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5904;&amp;#x7406;&amp;#x95EE;&amp;#x9898;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x662F; shared_ptr &amp;#x4E0E; weak_ptr, &amp;#x4E0A;&amp;#x4E00;&amp;#x7BC7;&amp;#x535A;&amp;#x5BA2;&amp;#x5B66;&amp;#x4E60;&amp;#x4E86; shared_ptr &amp;#x7684;&amp;#x57FA;&amp;#x672C;&amp;#x7528;&amp;#x6CD5; ( &lt;a href=&quot;/2016/06/09/shared-ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;/&quot;&gt;shared_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&lt;/a&gt; )&amp;#xFF0C;&amp;#x4ECA;&amp;#x5929;&amp;#x7EE7;&amp;#x7EED;&amp;#x5B66;&amp;#x4E60; weak_ptr &amp;#xFF0C;&amp;#x4EE5;&amp;#x4E0B;&amp;#x662F;&amp;#x5BF9; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/weak_ptr.htm&quot;&gt;boost::weak_ptr&lt;/a&gt;  &amp;#x7684;&amp;#x4E2D;&amp;#x6587;&amp;#x7FFB;&amp;#x8BD1;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;

    </summary>

      <category term="Unix/Linux" scheme="http://deyituo.github.io/categories/Unix-Linux/"/>


      <category term="shared_ptr" scheme="http://deyituo.github.io/tags/shared-ptr/"/>

      <category term="C++" scheme="http://deyituo.github.io/tags/C/"/>

      <category term="boost" scheme="http://deyituo.github.io/tags/boost/"/>

  </entry>

  <entry>
    <title>shared_ptr类模版</title>
    <link href="http://deyituo.github.io/2016/06/09/shared-ptr%E7%B1%BB%E6%A8%A1%E7%89%88/"/>
    <id>http://deyituo.github.io/2016/06/09/shared-ptr类模版/</id>
    <published>2016-06-09T15:25:16.000Z</published>
    <updated>2016-06-12T01:23:25.000Z</updated>

    <content type="html">&lt;blockquote&gt;
&lt;p&gt;&amp;#x6700;&amp;#x8FD1;&amp;#x5728;&amp;#x770B;&amp;#x9648;&amp;#x7855;&amp;#x7684;&amp;#x300A;Linux&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x670D;&amp;#x52A1;&amp;#x7AEF;&amp;#x7F16;&amp;#x7A0B;&amp;#xFF1A;&amp;#x4F7F;&amp;#x7528;muduo C++&amp;#x7F51;&amp;#x7EDC;&amp;#x5E93;&amp;#x300B;&amp;#xFF0C;&amp;#x7B2C;&amp;#x4E00;&amp;#x7AE0;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x8BB2;&amp;#x4E86;&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x4E0B;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5904;&amp;#x7406;&amp;#x95EE;&amp;#x9898;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x662F; shared_ptr &amp;#x4E0E; weak_ptr, &amp;#x4F46;&amp;#x4E66;&amp;#x4E2D;&amp;#x5BF9;&amp;#x8FD9;&amp;#x90E8;&amp;#x5206;&amp;#x7684;&amp;#x57FA;&amp;#x7840;&amp;#x4ECB;&amp;#x7ECD;&amp;#x6BD4;&amp;#x8F83;&amp;#x7B80;&amp;#x7565;&amp;#xFF0C;&amp;#x4EE5;&amp;#x524D;&amp;#x770B;&amp;#x8FC7;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&amp;#x4F46;&amp;#x4E00;&amp;#x76F4;&amp;#x6CA1;&amp;#x6709;&amp;#x5B8C;&amp;#x6574;&amp;#x5B66;&amp;#x4E60;&amp;#x8FC7;&amp;#xFF0C;&amp;#x56E0;&amp;#x800C;&amp;#x5B66;&amp;#x4E60;&amp;#x7FFB;&amp;#x8BD1;&amp;#x4E86;&amp;#x5B98;&amp;#x65B9;&amp;#x7684;&amp;#x6587;&amp;#x6863;&amp;#x8FDB;&amp;#x884C;&amp;#x5B66;&amp;#x4E60;&amp;#x3002;&amp;#x4EE5;&amp;#x4E0B;&amp;#x662F; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/shared_ptr.htm&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;boost::shared_ptr&lt;/a&gt; &amp;#x7684;&amp;#x4E2D;&amp;#x6587;&amp;#x7FFB;&amp;#x8BD1;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x4E00;&amp;#x90E8;&amp;#x5206;&amp;#x611F;&amp;#x89C9;&amp;#x4E0D;&amp;#x662F;&amp;#x5F88;&amp;#x91CD;&amp;#x8981;&amp;#x7684;&amp;#x8FD9;&amp;#x91CC;&amp;#x6682;&amp;#x65F6;&amp;#x6CA1;&amp;#x6709;&amp;#x7ED9;&amp;#x51FA;&amp;#x7FFB;&amp;#x8BD1;&amp;#x3002; &lt;/p&gt;
&lt;/blockquote&gt;
&lt;a id=&quot;more&quot;&gt;&lt;/a&gt;
&lt;h2 id=&quot;Introduction&quot;&gt;&lt;a href=&quot;#Introduction&quot; class=&quot;headerlink&quot; title=&quot;Introduction&quot;&gt;&lt;/a&gt;Introduction&lt;/h2&gt;&lt;p&gt;shared_ptr&amp;#x7C7B;&amp;#x6A21;&amp;#x7248;&amp;#x5B58;&amp;#x50A8;&amp;#x4E86;&amp;#x5982;&amp;#x7528; C++ &amp;#x7684; new &amp;#x8868;&amp;#x8FBE;&amp;#x5F0F;&amp;#x52A8;&amp;#x6001;&amp;#x5206;&amp;#x914D;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x3002;&amp;#x5F53;&amp;#x6700;&amp;#x540E;&amp;#x4E00;&amp;#x4E2A;&amp;#x6307;&amp;#x5411;&amp;#x8BE5;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684; share_ptr  &amp;#x88AB;&amp;#x9500;&amp;#x6BC1;&amp;#x6216;&amp;#x8005;&amp;#x91CD;&amp;#x7F6E;&amp;#x65F6;&amp;#xFF0C;&amp;#x8BE5;&amp;#x5BF9;&amp;#x8C61;&amp;#x88AB;&amp;#x4FDD;&amp;#x8BC1;&amp;#x4E00;&amp;#x5B9A;&amp;#x4F1A;&amp;#x88AB;&amp;#x5220;&amp;#x9664;&amp;#x3002;&lt;br&gt;&amp;#x4F8B;&amp;#x5982;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt; X &amp;gt; p1( &lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; X );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt; &lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &amp;gt; p2( &lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;(&lt;span class=&quot;number&quot;&gt;5&lt;/span&gt;) );&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x9500;&amp;#x6BC1;&amp;#x65F6;&amp;#xFF0C;&amp;#x4E0D;&amp;#x8BBA;&amp;#x6A21;&amp;#x7248;&amp;#x7684;&amp;#x53C2;&amp;#x6570;&amp;#x4E3A;&amp;#x4F55;&amp;#xFF0C;shared_ptr &amp;#x5C06;&amp;#x5220;&amp;#x9664;&amp;#x5728;&amp;#x6784;&amp;#x9020;&amp;#x65F6;&amp;#x6240;&amp;#x4F20;&amp;#x9012;&amp;#x771F;&amp;#x5B9E;&amp;#x7C7B;&amp;#x578B;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x3002;&amp;#x5728;&amp;#x7B2C;&amp;#x4E8C;&amp;#x4E2A;&amp;#x4F8B;&amp;#x5B50;&amp;#x4E2D;&amp;#xFF0C;&amp;#x5C3D;&amp;#x7BA1; p2 &amp;#x7C7B;&amp;#x578B;&amp;#x662F; shared_ptr&amp;lt; void &amp;gt;, &amp;#x5B58;&amp;#x50A8;&amp;#x4E86;&amp;#x4E00;&amp;#x4E2A;&amp;#x7C7B;&amp;#x578B;&amp;#x4E3A;void&amp;#xFF0A;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF0C; &amp;#x5F53; p2 &amp;#x88AB;&amp;#x9500;&amp;#x6BC1;&amp;#x6216;&amp;#x8005;&amp;#x88AB;&amp;#x91CD;&amp;#x7F6E;&amp;#xFF0C;&amp;#x5B83;&amp;#x5C06;&amp;#x5BF9;&amp;#x4F20;&amp;#x9012;&amp;#x5230;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x7684; int&amp;#xFF0A; &amp;#x8C03;&amp;#x7528;delete&amp;#x51FD;&amp;#x6570;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x57FA;&amp;#x672C;&amp;#x6210;&amp;#x5458;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x57FA;&amp;#x672C;&amp;#x6210;&amp;#x5458;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x57FA;&amp;#x672C;&amp;#x6210;&amp;#x5458;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x57FA;&amp;#x672C;&amp;#x6210;&amp;#x5458;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;p&gt;shared_ptr &amp;#x62E5;&amp;#x6709;&amp;#x62F7;&amp;#x8D1D;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;Move&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;&amp;#x62F7;&amp;#x8D1D;&amp;#x8D4B;&amp;#x503C;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;Move&amp;#x8D4B;&amp;#x503C;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;&amp;#x5E76;&amp;#x4E14;&amp;#x80FD;&amp;#x7528;&amp;#x5728;&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&amp;#x7684;&amp;#x5BB9;&amp;#x5668;&amp;#x91CC;&amp;#x3002;&amp;#x5BF9;&amp;#x6BD4;&amp;#x64CD;&amp;#x4F5C;&amp;#x7B26;&amp;#x540C;&amp;#x6837;&amp;#x4E5F;&amp;#x63D0;&amp;#x4F9B;&amp;#xFF0C;&amp;#x4F7F;&amp;#x5F97; shared_ptr &amp;#x80FD;&amp;#x7528;&amp;#x5728;&amp;#x6807;&amp;#x51C6;&amp;#x5E93;&amp;#x4E2D;&amp;#x7684;&amp;#x5173;&amp;#x8054;&amp;#x5BB9;&amp;#x5668;&amp;#x91CC;&amp;#x3002;&amp;#xFF08;&amp;#x5173;&amp;#x8054;&amp;#x5BB9;&amp;#x5668;&amp;#xFF1F;&amp;#xFF09;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x5FAA;&amp;#x73AF;&amp;#x5D4C;&amp;#x5957;&amp;#x95EE;&amp;#x9898;&quot;&gt;&lt;a href=&quot;#&amp;#x5FAA;&amp;#x73AF;&amp;#x5D4C;&amp;#x5957;&amp;#x95EE;&amp;#x9898;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x5FAA;&amp;#x73AF;&amp;#x5D4C;&amp;#x5957;&amp;#x95EE;&amp;#x9898;&quot;&gt;&lt;/a&gt;&amp;#x5FAA;&amp;#x73AF;&amp;#x5D4C;&amp;#x5957;&amp;#x95EE;&amp;#x9898;&lt;/h3&gt;&lt;p&gt;&amp;#x56E0;&amp;#x4E3A;&amp;#x4F7F;&amp;#x7528;&amp;#x4E86;&amp;#x5F15;&amp;#x7528;&amp;#x8BA1;&amp;#x6570;&amp;#x6765;&amp;#x4F5C;&amp;#x4E3A;&amp;#x5176;&amp;#x5B9E;&amp;#x73B0;&amp;#xFF0C;&amp;#x56E0;&amp;#x6B64;&amp;#x5FAA;&amp;#x73AF;&amp;#x5D4C;&amp;#x5957; shared_ptr &amp;#x7684;&amp;#x5B9E;&amp;#x4F53;&amp;#x5C06;&amp;#x4E0D;&amp;#x4F1A;&amp;#x88AB;&amp;#x56DE;&amp;#x6536;&amp;#x3002; &amp;#x4F8B;&amp;#x5982;&amp;#xFF0C;&amp;#x5982;&amp;#x679C; main() &amp;#x6709;&amp;#x4E00;&amp;#x4E2A;&amp;#x6307;&amp;#x5411;&amp;#x5BF9;&amp;#x8C61; A &amp;#x7684; shared_ptr&amp;#xFF0C;&amp;#x800C; A &amp;#x81EA;&amp;#x8EAB;&amp;#x53C8;&amp;#x76F4;&amp;#x63A5;&amp;#x6216;&amp;#x8005;&amp;#x95F4;&amp;#x63A5;&amp;#x5730;&amp;#x62E5;&amp;#x6709;&amp;#x4E00;&amp;#x4E2A;&amp;#x6307;&amp;#x5411; A &amp;#x7684; shared_ptr&amp;#xFF0C;&amp;#x90A3;&amp;#x4E48; A &amp;#x7684;&amp;#x5F15;&amp;#x7528;&amp;#x8BA1;&amp;#x6570;&amp;#x5C06;&amp;#x4E3A; 2&amp;#x3002;&amp;#x9500;&amp;#x6BC1; main() &amp;#x4E2D;&amp;#x7684; shared_ptr &amp;#x5C06;&amp;#x4F7F;&amp;#x5F97; A &amp;#x7684;&amp;#x5F15;&amp;#x7528;&amp;#x8BA1;&amp;#x6570;&amp;#x4E3A; 1&amp;#x3002;&amp;#xFF08;&amp;#x4F7F;&amp;#x7528; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/weak_ptr.htm&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;weak_ptr&lt;/a&gt; &amp;#x6253;&amp;#x7834;&amp;#x5FAA;&amp;#x73AF;&amp;#xFF1F;&amp;#xFF09;&lt;/p&gt;
&lt;h3 id=&quot;void-&amp;#x6A21;&amp;#x7248;&amp;#x53C2;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#void-&amp;#x6A21;&amp;#x7248;&amp;#x53C2;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;void &amp;#x6A21;&amp;#x7248;&amp;#x53C2;&amp;#x6570;&quot;&gt;&lt;/a&gt;void &amp;#x6A21;&amp;#x7248;&amp;#x53C2;&amp;#x6570;&lt;/h3&gt;&lt;p&gt;shared_ptr &amp;#x4F7F;&amp;#x7528; T &amp;#x6765;&amp;#x8868;&amp;#x660E;&amp;#x6240;&amp;#x6307;&amp;#x5411;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x7C7B;&amp;#x578B;&amp;#xFF0C;&amp;#x5B83;&amp;#x53CA;&amp;#x5B83;&amp;#x7684;&amp;#x5F88;&amp;#x591A;&amp;#x6210;&amp;#x5458;&amp;#x51FD;&amp;#x6570;&amp;#x5E76;&amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x4F7F;&amp;#x7528;&amp;#x5230; T&amp;#xFF1B;&amp;#x5B83;&amp;#x88AB;&amp;#x5141;&amp;#x8BB8;&amp;#x662F;&amp;#x4E00;&amp;#x4E2A;&amp;#x4E0D;&amp;#x5B8C;&amp;#x6574;&amp;#x7684;&amp;#x7C7B;&amp;#x578B;&amp;#xFF0C;&amp;#x6216;&amp;#x8005; void&amp;#xFF0C;&amp;#x9700;&amp;#x8981;&amp;#x4F7F;&amp;#x7528;&amp;#x5230; T &amp;#x7684;&amp;#x6210;&amp;#x5458;&amp;#x51FD;&amp;#x6570;&amp;#x5C06;&amp;#x5728;&amp;#x4E0B;&amp;#x9762;&amp;#x6587;&amp;#x6863;&amp;#x4E2D;&amp;#x4ECB;&amp;#x7ECD;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x8F6C;&amp;#x6362;&quot;&gt;&lt;a href=&quot;#&amp;#x8F6C;&amp;#x6362;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x8F6C;&amp;#x6362;&quot;&gt;&lt;/a&gt;&amp;#x8F6C;&amp;#x6362;&lt;/h3&gt;&lt;p&gt;shared_ptr&amp;lt; T &amp;gt; &amp;#x80FD;&amp;#x88AB;&amp;#x9690;&amp;#x5F0F;&amp;#x5730;&amp;#x8F6C;&amp;#x6362;&amp;#x5230; shared_ptr&amp;lt; U &amp;gt;&amp;#xFF0C;T&amp;#xFF0A; &amp;#x80FD;&amp;#x88AB;&amp;#x9690;&amp;#x5F0F;&amp;#x8F6C;&amp;#x6362;&amp;#x5230; U&amp;#xFF0A;&amp;#x3002;&amp;#x7279;&amp;#x522B;&amp;#x5730;&amp;#xFF0C; shared_ptr&amp;lt; T &amp;gt; &amp;#x80FD;&amp;#x88AB;&amp;#x9690;&amp;#x5F0F;&amp;#x8F6C;&amp;#x6362;&amp;#x4E3A; shared_ptr&amp;lt; T const &amp;gt;&amp;#xFF1B;&amp;#x5F53; U &amp;#x662F; T &amp;#x7684;&amp;#x57FA;&amp;#x7C7B;&amp;#x65F6;&amp;#xFF0C; &amp;#x80FD;&amp;#x88AB;&amp;#x8F6C;&amp;#x6362;&amp;#x5230; shared_ptr&amp;lt; U &amp;gt;&amp;#xFF1B;&amp;#x8F6C;&amp;#x6362;&amp;#x5230; shared_ptr&amp;lt; void &amp;gt;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;std-shared-ptr&quot;&gt;&lt;a href=&quot;#std-shared-ptr&quot; class=&quot;headerlink&quot; title=&quot;std::shared_ptr&quot;&gt;&lt;/a&gt;std::shared_ptr&lt;/h3&gt;&lt;p&gt;shared_ptr &amp;#x662F; C++11 &amp;#x4E00;&amp;#x90E8;&amp;#x5206;&amp;#xFF0C;&amp;#x4E3A; std::shared_ptr&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x6570;&amp;#x7EC4;&amp;#x6307;&amp;#x9488;&quot;&gt;&lt;a href=&quot;#&amp;#x6570;&amp;#x7EC4;&amp;#x6307;&amp;#x9488;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6570;&amp;#x7EC4;&amp;#x6307;&amp;#x9488;&quot;&gt;&lt;/a&gt;&amp;#x6570;&amp;#x7EC4;&amp;#x6307;&amp;#x9488;&lt;/h3&gt;&lt;p&gt;&amp;#x4ECE; Boost 1.53 &amp;#x5F00;&amp;#x59CB;&amp;#xFF0C;shared_ptr &amp;#x80FD;&amp;#x591F;&amp;#x4FDD;&amp;#x5B58;&amp;#x6307;&amp;#x5411;&amp;#x52A8;&amp;#x6001;&amp;#x5206;&amp;#x914D;&amp;#x6570;&amp;#x7EC4;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&amp;#x6A21;&amp;#x7248;&amp;#x53C2;&amp;#x6570;&amp;#x4E3A; T[] &amp;#x6216;&amp;#x8005; T[N]&amp;#xFF0C;&amp;#x4E24;&amp;#x8005;&amp;#x95F4;&amp;#x51E0;&amp;#x4E4E;&amp;#x6CA1;&amp;#x4EC0;&amp;#x4E48;&amp;#x5DEE;&amp;#x522B;&amp;#xFF0C;&amp;#x540E;&amp;#x8005;&amp;#x80FD;&amp;#x591F;&amp;#x68C0;&amp;#x67E5;&amp;#x8FDB;&amp;#x884C;&amp;#x4E0B;&amp;#x6807;&amp;#x7684;&amp;#x8303;&amp;#x56F4;&amp;#x3002;&lt;br&gt;&amp;#x4F8B;&amp;#x5982;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt; &lt;span class=&quot;keyword&quot;&gt;double&lt;/span&gt;[ &lt;span class=&quot;number&quot;&gt;1024&lt;/span&gt; ] &amp;gt; p1( &lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;double&lt;/span&gt;[ &lt;span class=&quot;number&quot;&gt;1024&lt;/span&gt; ])&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt; &lt;span class=&quot;keyword&quot;&gt;double&lt;/span&gt;[] &amp;gt; p2( &lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;double&lt;/span&gt;[n] )&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;h2 id=&quot;Best-practices&quot;&gt;&lt;a href=&quot;#Best-practices&quot; class=&quot;headerlink&quot; title=&quot;Best practices&quot;&gt;&lt;/a&gt;Best practices&lt;/h2&gt;&lt;p&gt;&amp;#x53BB;&amp;#x9664;&amp;#x5185;&amp;#x5B58;&amp;#x6CC4;&amp;#x6F0F;&amp;#x7684;&amp;#x4E00;&amp;#x4E2A;&amp;#x7B80;&amp;#x5355;&amp;#x65B9;&amp;#x6CD5;&amp;#x662F;&amp;#xFF1A;&amp;#x603B;&amp;#x662F;&amp;#x4F7F;&amp;#x7528;&amp;#x4E00;&amp;#x4E2A;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x53BB;&amp;#x5B58;&amp;#x50A8; new &amp;#x7684;&amp;#x7ED3;&amp;#x679C;&amp;#x3002;&amp;#x6BCF;&amp;#x4E2A; new &amp;#x5173;&amp;#x952E;&amp;#x5B57;&amp;#x51FA;&amp;#x73B0;&amp;#x7684;&amp;#x5730;&amp;#x65B9;&amp;#x5E94;&amp;#x8BE5;&amp;#x6709;&amp;#x5982;&amp;#x4E0B;&amp;#x7684;&amp;#x5F62;&amp;#x5F0F;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt; T &amp;gt; p( &lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; Y );&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x8FD9;&amp;#x91CC; shared_ptr &amp;#x53EF;&amp;#x4EE5;&amp;#x7528;&amp;#x5176;&amp;#x4ED6;&amp;#x4EE5;&amp;#x5916;&amp;#x7684;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x4EE3;&amp;#x66FF;&amp;#xFF1B; T &amp;#x548C; Y &amp;#x53EF;&amp;#x4EE5;&amp;#x662F;&amp;#x76F8;&amp;#x540C;&amp;#x7684;&amp;#x7C7B;&amp;#x578B;&amp;#xFF0C;Y &amp;#x7684;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x4E5F;&amp;#x53EF;&amp;#x4EE5;&amp;#x4F5C;&amp;#x4E3A;&amp;#x4F20;&amp;#x9012;&amp;#x7684;&amp;#x53C2;&amp;#x6570;&amp;#x3002;&lt;/p&gt;
&lt;p&gt;&amp;#x5982;&amp;#x679C;&amp;#x4F60;&amp;#x4ED4;&amp;#x7EC6;&amp;#x89C2;&amp;#x5BDF;&amp;#xFF0C;&amp;#x4F60;&amp;#x53D1;&amp;#x73B0;&amp;#x8FD9;&amp;#x91CC;&amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x4F7F;&amp;#x7528; delete &amp;#x8BED;&amp;#x53E5;&amp;#xFF0C;try&amp;#xFF0F;catch &amp;#x4E5F;&amp;#x5F88;&amp;#x5C11;&amp;#x3002;&lt;/p&gt;
&lt;p&gt;&amp;#x907F;&amp;#x514D;&amp;#x4F7F;&amp;#x7528;&amp;#x672A;&amp;#x547D;&amp;#x540D;&amp;#x7684;&amp;#x4E34;&amp;#x65F6; shared_ptr &amp;#x8282;&amp;#x7701;&amp;#x4EE3;&amp;#x7801;&amp;#x4E66;&amp;#x5199;&amp;#xFF0C;&amp;#x4E3A;&amp;#x8BF4;&amp;#x660E;&amp;#x8FD9;&amp;#x4E2A;&amp;#x95EE;&amp;#x9898;&amp;#xFF0C;&amp;#x8003;&amp;#x8651;&amp;#x4E0B;&amp;#x9762;&amp;#x8FD9;&amp;#x4E2A;&amp;#x4F8B;&amp;#x5B50;&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;f&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;( &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt; &amp;gt;, &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;g&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;ok&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;	&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt; &amp;gt; p( &lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;(&lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;) );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;	f( p, g() );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;bad&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;	f( &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt; &amp;gt;( &lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;(&lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;)), g() );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;ok&amp;#x51FD;&amp;#x6570;&amp;#x4F7F;&amp;#x7528;&amp;#x4E86;&amp;#x6BD4;&amp;#x8F83;&amp;#x597D;&amp;#x7684;&amp;#x65B9;&amp;#x5F0F;&amp;#xFF0C;&amp;#x800C; bad &amp;#x51FD;&amp;#x6570;&amp;#x4F7F;&amp;#x7528;&amp;#x4E86;&amp;#x4E34;&amp;#x65F6;&amp;#x7684; shared_ptr&amp;#xFF0C;&amp;#x5BFC;&amp;#x81F4;&amp;#x4E86;&amp;#x5185;&amp;#x5B58;&amp;#x6CC4;&amp;#x6F0F;&amp;#x7684;&amp;#x53EF;&amp;#x80FD;&amp;#x3002;&amp;#x56E0;&amp;#x4E3A;&amp;#x51FD;&amp;#x6570;&amp;#x53C2;&amp;#x6570;&amp;#x7684;&amp;#x8BA1;&amp;#x7B97;&amp;#x6CA1;&amp;#x6709;&amp;#x6307;&amp;#x5B9A;&amp;#x987A;&amp;#x5E8F;&amp;#xFF0C;&amp;#x53EF;&amp;#x80FD; new int(2) &amp;#x4F1A;&amp;#x9996;&amp;#x5148;&amp;#x6267;&amp;#x884C;&amp;#xFF0C;&amp;#x7136;&amp;#x540E; g()&amp;#xFF0C;&amp;#x4F46;&amp;#x5982;&amp;#x679C;&amp;#x51FD;&amp;#x6570; g &amp;#x5728;&amp;#x6267;&amp;#x884C;&amp;#x662F;&amp;#x629B;&amp;#x51FA;&amp;#x4E86;&amp;#x5F02;&amp;#x5E38;&amp;#xFF0C;&amp;#x90A3;&amp;#x4E48;&amp;#x6211;&amp;#x4EEC;&amp;#x5C06;&amp;#x65E0;&amp;#x6CD5;&amp;#x8C03;&amp;#x7528; shared_ptr &amp;#x7684;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x3002; &amp;#x94FE;&amp;#x63A5; Herb Sutter&amp;#x2019;s treatment (&amp;#x53CA;here) &amp;#x5BF9;&amp;#x8FD9;&amp;#x4E2A;&amp;#x95EE;&amp;#x9898;&amp;#x6709;&amp;#x66F4;&amp;#x591A;&amp;#x7684;&amp;#x8BF4;&amp;#x660E;&amp;#x3002;&lt;/p&gt;
&lt;p&gt;&amp;#x4E0A;&amp;#x8FF0;&amp;#x63CF;&amp;#x8FF0;&amp;#x7684;&amp;#x5F02;&amp;#x5E38;&amp;#x5B89;&amp;#x5168;&amp;#x95EE;&amp;#x9898;&amp;#x4E5F;&amp;#x80FD;&amp;#x901A;&amp;#x8FC7;&amp;#x4F7F;&amp;#x7528; make_shared &amp;#x6216;&amp;#x8005; allocate_shared &amp;#x5DE5;&amp;#x5382;&amp;#x51FD;&amp;#x6570;&amp;#x88AB;&amp;#x6392;&amp;#x9664;&amp;#xFF08;&amp;#x5B9A;&amp;#x4E49;&amp;#x5728; boost/make_shared.hpp&amp;#xFF09;&amp;#x3002;&amp;#x8FD9;&amp;#x4E9B;&amp;#x5DE5;&amp;#x5382;&amp;#x51FD;&amp;#x6570;&amp;#x901A;&amp;#x8FC7;&amp;#x6574;&amp;#x5408;&amp;#x5185;&amp;#x5B58;&amp;#x52A0;&amp;#x5FEB;&amp;#x4E86;&amp;#x7A0B;&amp;#x5E8F;&amp;#x7684;&amp;#x6548;&amp;#x7387;&amp;#x3002;&lt;/p&gt;
&lt;h2 id=&quot;Synopsis&quot;&gt;&lt;a href=&quot;#Synopsis&quot; class=&quot;headerlink&quot; title=&quot;Synopsis&quot;&gt;&lt;/a&gt;Synopsis&lt;/h2&gt;&lt;figure class=&quot;highlight c&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;25&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;26&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;27&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;28&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;29&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;30&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;31&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;32&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;33&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;34&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;35&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;36&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;37&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;38&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;39&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;40&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;41&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;42&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;43&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;44&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;45&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;46&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;47&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;48&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;49&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;50&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;51&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;52&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;53&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;54&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;55&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;56&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;57&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;58&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;59&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;60&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;61&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;62&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;63&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;64&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;65&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;66&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;67&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;68&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;69&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;70&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;71&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;72&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;73&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;74&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;75&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;76&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;77&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;78&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;79&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;80&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;81&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;82&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;83&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;84&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;85&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;86&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;87&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;88&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;89&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;90&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;91&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;92&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;93&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;94&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;95&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;96&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;97&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;98&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;99&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;100&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;101&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;102&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;103&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;104&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;105&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;106&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;107&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;108&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;109&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;110&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;111&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;112&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;113&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;114&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;115&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;116&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;117&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;118&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;119&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;120&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;namespace&lt;/span&gt; boost {&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; bad_weak_ptr: &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt; &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::exception;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; weak_ptr;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; {&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;typedef&lt;/span&gt; see below element_type;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt;); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;explicit&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;shared_ptr&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(Y * p)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(Y * p, D d);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; A&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(Y * p, D d, A a);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt; p, D d);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; A&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt; p, D d, A a);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      ~&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp;&amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp;&amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r, element_type * p); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;explicit&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;shared_ptr&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(weak_ptr&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;explicit&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;shared_ptr&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;auto_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp; r)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;auto_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp;&amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;unique_ptr&lt;/span&gt;&amp;lt;Y, D&amp;gt; &amp;amp;&amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp;&amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp;&amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;auto_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;auto_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp;&amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;unique_ptr&lt;/span&gt;&amp;lt;Y, D&amp;gt; &amp;amp;&amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt;); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(Y * p)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(Y * p, D d)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; A&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(Y * p, D d, A a)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r, element_type * p)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      T &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;*() &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws; only valid when T is not an array type&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      T * &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;-&amp;gt;() &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws; only valid when T is not an array type&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      element_type &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;[](&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;ptrdiff_t&lt;/span&gt; i) &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws; only valid when T is an array type&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;element_type * &lt;span class=&quot;title&quot;&gt;get&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;unique&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;long&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;use_count&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;explicit&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;bool&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; b)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;owner_before&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; rhs)&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;      &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;owner_before&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(weak_ptr&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; rhs)&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  };&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; U&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;==(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; a, &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;U&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; b); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; U&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;!=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; a, &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;U&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; b); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; U&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;&amp;lt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; a, &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;U&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; b); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;==(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; p, &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt;); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;==(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt;, &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; p); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;!=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; p, &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt;); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;!=(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt;, &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; p); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &amp;amp; a, &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &amp;amp; b)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;typename&lt;/span&gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt;::&lt;span class=&quot;function&quot;&gt;element_type * &lt;span class=&quot;title&quot;&gt;get_pointer&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; p)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; U&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; static_pointer_cast(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;U&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; U&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; const_pointer_cast(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;U&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; U&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; dynamic_pointer_cast(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;U&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; U&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; reinterpet_pointer_cast(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;U&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; E, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::basic_ostream&amp;lt;E, T&amp;gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;&amp;lt;&amp;lt; (&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::basic_ostream&amp;lt;E, T&amp;gt; &amp;amp; os, &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; p);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; T&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    &lt;span class=&quot;function&quot;&gt;D * &lt;span class=&quot;title&quot;&gt;get_deleter&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;T&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; p)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;h2 id=&quot;Members&quot;&gt;&lt;a href=&quot;#Members&quot; class=&quot;headerlink&quot; title=&quot;Members&quot;&gt;&lt;/a&gt;Members&lt;/h2&gt;&lt;h3 id=&quot;element-type&quot;&gt;&lt;a href=&quot;#element-type&quot; class=&quot;headerlink&quot; title=&quot;element_type&quot;&gt;&lt;/a&gt;element_type&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;typedef&lt;/span&gt; ... element_type;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x5F53; T &amp;#x4E0D;&amp;#x662F;&amp;#x6570;&amp;#x7EC4;&amp;#x7C7B;&amp;#x578B;&amp;#x65F6;&amp;#xFF0C;element_type &amp;#x662F; T&amp;#xFF1B;&amp;#x5F53; T &amp;#x662F; U[] &amp;#x6216;&amp;#x8005; U[N] &amp;#x65F6;&amp;#xFF0C;element_type &amp;#x662F; U&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;&amp;#x9ED8;&amp;#x8BA4;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x9ED8;&amp;#x8BA4;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x9ED8;&amp;#x8BA4;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x9ED8;&amp;#x8BA4;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt;); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x521B;&amp;#x5EFA;&amp;#x4E00;&amp;#x4E2A;&amp;#x7A7A;&amp;#x7684; shared_ptr&amp;#x3002;&lt;br&gt;&amp;#x540E;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;use_count() == 0 &amp;amp;&amp;amp; get() == 0&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;p&gt;&amp;#x4FDD;&amp;#x8BC1; nothrows &amp;#x662F;&amp;#x91CD;&amp;#x8981;&amp;#x7684;&amp;#xFF0C;&amp;#x56E0;&amp;#x4E3A; reset() &amp;#x901A;&amp;#x8FC7;&amp;#x9ED8;&amp;#x8BA4;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x6765;&amp;#x6307;&amp;#x5B9A;&amp;#xFF0C;&amp;#x8FD9;&amp;#x4E5F;&amp;#x8868;&amp;#x660E;&amp;#x4E86;&amp;#x9ED8;&amp;#x8BA4;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x4E0D;&amp;#x80FD;&amp;#x5206;&amp;#x914D;&amp;#x5185;&amp;#x5B58;&amp;#x7A7A;&amp;#x95F4;&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x6307;&amp;#x9488;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x6307;&amp;#x9488;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6307;&amp;#x9488;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x6307;&amp;#x9488;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;explicit&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;shared_ptr&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(Y *p)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x524D;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;Y &amp;#x5FC5;&amp;#x987B;&amp;#x662F;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&amp;#x5F53; T &amp;#x662F;&amp;#x6570;&amp;#x7EC4;&amp;#x7C7B;&amp;#x578B;&amp;#x65F6;&amp;#xFF0C;&amp;#x8BED;&amp;#x53E5; delete[] p&amp;#xFF1B;&amp;#x5F53; T &amp;#x975E;&amp;#x6570;&amp;#x7EC4;&amp;#x7C7B;&amp;#x578B;&amp;#x65F6;&amp;#xFF0C;delete p &amp;#x5FC5;&amp;#x987B;&amp;#x53EF;&amp;#x4EE5;&amp;#x6267;&amp;#x884C;&amp;#xFF0C;&amp;#x4E0D;&amp;#x80FD;&amp;#x629B;&amp;#x51FA;&amp;#x5F02;&amp;#x5E38;&amp;#x3002;&amp;#x5F53; T &amp;#x662F; U[N]&amp;#xFF0C;Y(&lt;em&gt;)[N] &amp;#x5FC5;&amp;#x987B;&amp;#x53EF;&amp;#x4EE5;&amp;#x8F6C;&amp;#x5316;&amp;#x5230; T&amp;#xFF0A;&amp;#xFF1B;&amp;#x5F53; T &amp;#x662F; U[]&amp;#xFF0C;Y(&lt;/em&gt;)[] &amp;#x5FC5;&amp;#x987B;&amp;#x53EF;&amp;#x4EE5;&amp;#x8F6C;&amp;#x5316;&amp;#x5230; T&amp;#xFF0A;&amp;#xFF1B;&amp;#x5426;&amp;#x5219;&amp;#xFF0C; Y&amp;#xFF0A; &amp;#x5FC5;&amp;#x987B;&amp;#x53EF;&amp;#x4EE5;&amp;#x8F6C;&amp;#x5316;&amp;#x5230; T&amp;#xFF0A;&amp;#x3002;&lt;br&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x5F53; T &amp;#x975E;&amp;#x6570;&amp;#x7EC4;&amp;#x7C7B;&amp;#x578B;&amp;#x65F6;&amp;#xFF0C;&amp;#x6784;&amp;#x9020;&amp;#x4E00;&amp;#x4E2A;&amp;#x62E5;&amp;#x6709;&amp;#x6307;&amp;#x9488; p &amp;#x7684;shared_ptr&amp;#x3002;&amp;#x5426;&amp;#x5219;&amp;#xFF0C;&amp;#x521B;&amp;#x5EFA;&amp;#x4E00;&amp;#x4E2A;&amp;#x62E5;&amp;#x6709;&amp;#x6307;&amp;#x9488; p &amp;#x548C;&amp;#x4E00;&amp;#x4E2A;&amp;#x53EF;&amp;#x4EE5;&amp;#x8C03;&amp;#x7528; delete[] p &amp;#x7684; deleter&amp;#x3002;&lt;br&gt;&amp;#x540E;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;use_count() == 1 &amp;amp;&amp;amp; get() == p&amp;#x3002;&amp;#x5982;&amp;#x679C; T &amp;#x975E;&amp;#x6570;&amp;#x7EC4;&amp;#x7C7B;&amp;#x578B;&amp;#x5E76;&amp;#x4E14; p &amp;#x53EF;&amp;#x4EE5;&amp;#x8F6C;&amp;#x5316;&amp;#x5230; enable_shared_from_this&amp;lt; V &amp;gt;*&amp;#xFF0C;p-&amp;gt;shared_from_this()&amp;#x8FD4;&amp;#x56DE; &amp;#xFF0A;this &amp;#x7684;&amp;#x4E00;&amp;#x4E2A;&amp;#x62F7;&amp;#x8D1D;&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x5F53;&amp;#x8D44;&amp;#x6E90;&amp;#x4E0D;&amp;#x80FD;&amp;#x88AB;&amp;#x6EE1;&amp;#x8DB3;&amp;#x65F6;&amp;#xFF0C;std::bad_alloc &amp;#x6216;&amp;#x8005;&amp;#x81EA;&amp;#x5B9A;&amp;#x4E49;&amp;#x7684;&amp;#x5F02;&amp;#x5E38;&amp;#x3002;&lt;br&gt;&amp;#x5F02;&amp;#x5E38;&amp;#x5B89;&amp;#x5168;&amp;#xFF1A;&amp;#x5982;&amp;#x679C;&amp;#x5F02;&amp;#x5E38;&amp;#x88AB;&amp;#x629B;&amp;#x51FA;&amp;#xFF0C;T &amp;#x662F;&amp;#x6570;&amp;#x7EC4;&amp;#x7C7B;&amp;#x578B;&amp;#xFF0C;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x8C03;&amp;#x7528; delete[] p&amp;#xFF1B;T &amp;#x975E;&amp;#x6570;&amp;#x7EC4;&amp;#x7C7B;&amp;#x578B;&amp;#x5219;&amp;#x8C03;&amp;#x7528; delete p&amp;#x3002;&lt;br&gt;&amp;#x6CE8;&amp;#x610F;&amp;#xFF1A;p &amp;#x5FC5;&amp;#x987B;&amp;#x662F;&amp;#x6307;&amp;#x5411;&amp;#x901A;&amp;#x8FC7; C++ &amp;#x7684; new &amp;#x8868;&amp;#x8FBE;&amp;#x5F0F;&amp;#x6765;&amp;#x521B;&amp;#x5EFA;&amp;#x7684;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&amp;#x6216;&amp;#x8005;&amp;#x4E3A; 0&amp;#x3002;&amp;#x5373;&amp;#x4F7F; p &amp;#x4E3A; 0&amp;#xFF0C; &amp;#x540E;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#x4E2D; use_count() &amp;#x4E5F;&amp;#x4E3A; 1&amp;#xFF1B;delete &amp;#x4F5C;&amp;#x7528;&amp;#x4E8E;&amp;#x503C;&amp;#x4E3A; 0 &amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x65E0;&amp;#x5BB3;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;p&gt;&amp;#x8BE5;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x662F;&amp;#x6A21;&amp;#x7248;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C;&amp;#x662F;&amp;#x4E3A;&amp;#x8BB0;&amp;#x5FC6;&amp;#x4F20;&amp;#x8FDB;&amp;#x6765;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x771F;&amp;#x5B9E;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#x5C06;&amp;#x4F1A;&amp;#x8C03;&amp;#x7528; delete &amp;#x4F5C;&amp;#x7528;&amp;#x4E8E;&amp;#x539F;&amp;#x59CB;&amp;#x7C7B;&amp;#x578B;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&amp;#x5373;&amp;#x4F7F;&amp;#x5F53; T &amp;#x6CA1;&amp;#x6709;&amp;#x4E00;&amp;#x4E2A;&amp;#x865A;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#x6216;&amp;#x8005;&amp;#x4E3A; void&amp;#x3002;&lt;/p&gt;
&lt;h3 id=&quot;&amp;#x5E26;-deleter-&amp;#x7684;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x5E26;-deleter-&amp;#x7684;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x5E26; deleter &amp;#x7684;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x5E26; deleter &amp;#x7684;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(Y * p, D d);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; A&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(Y * p, D d, A a);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt; p, D d);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; A&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt; p, D d, A a);&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;h3 id=&quot;&amp;#x62F7;&amp;#x8D1D;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x62F7;&amp;#x8D1D;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x62F7;&amp;#x8D1D;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x62F7;&amp;#x8D1D;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x524D;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;Y&amp;#xFF0A; &amp;#x53EF;&amp;#x4EE5;&amp;#x8F6C;&amp;#x5316;&amp;#x5230; T&amp;#xFF0A;&amp;#x3002;&lt;br&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x5982;&amp;#x679C; r &amp;#x662F;&amp;#x7A7A;&amp;#x7684;&amp;#xFF0C;&amp;#x6784;&amp;#x9020;&amp;#x4E00;&amp;#x4E2A;&amp;#x7A7A;&amp;#x7684;shared_ptr&amp;#xFF1B;&amp;#x5426;&amp;#x5219;&amp;#xFF0C;&amp;#x6784;&amp;#x9020;&amp;#x4E00;&amp;#x4E2A;&amp;#x5206;&amp;#x4EAB; r &amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x6240;&amp;#x6709;&amp;#x6743;&amp;#x7684;shared_ptr&amp;#x3002;&lt;br&gt;&amp;#x540E;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;get() == r.get() &amp;amp;&amp;amp; use_count() == r.use_count()&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;Move-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#Move-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;Move &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;Move &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp;&amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp;&amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x524D;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;Y&amp;#xFF0A; &amp;#x53EF;&amp;#x4EE5;&amp;#x8F6C;&amp;#x5316;&amp;#x5230; T&amp;#xFF0A;&amp;#x3002;&lt;br&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;move &amp;#x6784;&amp;#x9020;&amp;#x4E00;&amp;#x4E2A;&amp;#x4ECE; r &amp;#x7684; shared_ptr&amp;#x3002;&lt;br&gt;&amp;#x540E;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;&amp;#xFF0A;this &amp;#x5305;&amp;#x542B;&amp;#x4E86; r &amp;#x65E7;&amp;#x7684;&amp;#x503C;&amp;#x3002;r &amp;#x4E3A;&amp;#x7A7A;&amp;#x5E76;&amp;#x4E14; r.get() == 0&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;aliasing-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#aliasing-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;aliasing &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;aliasing &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r, element_type * p); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;h3 id=&quot;weak-ptr-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#weak-ptr-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;weak_ptr &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;weak_ptr &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;explicit&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;shared_ptr&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(weak_ptr&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x524D;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;Y&amp;#xFF0A; &amp;#x53EF;&amp;#x4EE5;&amp;#x8F6C;&amp;#x5316;&amp;#x5230; T&amp;#xFF0A;&amp;#x3002;&lt;br&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x6784;&amp;#x9020;&amp;#x4E00;&amp;#x4E2A;&amp;#x5206;&amp;#x4EAB; r &amp;#x6240;&amp;#x6709;&amp;#x6743;&amp;#x7684; shared_ptr &amp;#x5E76;&amp;#x4E14;&amp;#x590D;&amp;#x5236; r &amp;#x4E2D;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x3002;&lt;br&gt;&amp;#x540E;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;use_count() == r.use_count()&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x5F53; r.use_count() == 0, bad_weak_ptr&amp;#x3002;&lt;br&gt;&amp;#x5F02;&amp;#x5E38;&amp;#x5B89;&amp;#x5168;&amp;#xFF1A;&amp;#x5982;&amp;#x679C;&amp;#x5F02;&amp;#x5E38;&amp;#x629B;&amp;#x51FA;&amp;#xFF0C;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x5C06;&amp;#x65E0;&amp;#x6548;&amp;#x679C;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;auto-ptr-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#auto-ptr-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;auto_ptr &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;auto_ptr &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;auto_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;auto_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp;&amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x524D;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;Y&amp;#xFF0A; &amp;#x53EF;&amp;#x4EE5;&amp;#x8F6C;&amp;#x5316;&amp;#x5230; T&amp;#xFF0A;&amp;#x3002;&lt;br&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x6784;&amp;#x9020;&amp;#x4E00;&amp;#x4E2A; shared_ptr&amp;#xFF0C;&amp;#x5B58;&amp;#x50A8; r.release() &amp;#x7684;&amp;#x62F7;&amp;#x8D1D;&lt;br&gt;&amp;#x540E;&amp;#x7F6E;&amp;#x6761;&amp;#x4EF6;&amp;#xFF1A;use_count() == 1&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x5F53;&amp;#x8D44;&amp;#x6E90;&amp;#x4E0D;&amp;#x80FD;&amp;#x88AB;&amp;#x6EE1;&amp;#x8DB3;&amp;#x65F6;&amp;#xFF0C;std::bad_alloc &amp;#x6216;&amp;#x8005;&amp;#x81EA;&amp;#x5B9A;&amp;#x4E49;&amp;#x7684;&amp;#x5F02;&amp;#x5E38;&amp;#x3002;&lt;br&gt;&amp;#x5F02;&amp;#x5E38;&amp;#x5B89;&amp;#x5168;&amp;#xFF1A;&amp;#x5982;&amp;#x679C;&amp;#x5F02;&amp;#x5E38;&amp;#x629B;&amp;#x51FA;&amp;#xFF0C;&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&amp;#x5C06;&amp;#x65E0;&amp;#x6548;&amp;#x679C;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;unique-ptr-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#unique-ptr-&amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;unique_ptr &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;unique_ptr &amp;#x6784;&amp;#x9020;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;unique_ptr&lt;/span&gt;&amp;lt;Y, D&amp;gt; &amp;amp;&amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;h3 id=&quot;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;a href=&quot;#&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&quot;&gt;&lt;/a&gt;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;~&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;(); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&lt;br&gt;    &amp;#x5982;&amp;#x679C; &amp;#xFF0A;this &amp;#x4E3A;&amp;#x7A7A;&amp;#xFF0C;&amp;#x6216;&amp;#x8005;&amp;#x4E0E;&amp;#x53E6;&amp;#x5916;&amp;#x4E00;&amp;#x4E2A; shared_ptr &amp;#x5171;&amp;#x4EAB;&amp;#x6240;&amp;#x6709;&amp;#x6743; (use_count()&amp;gt;1)&amp;#xFF0C;&amp;#x90A3;&amp;#x4E48;&amp;#x6CA1;&amp;#x6709;&amp;#x526F;&amp;#x4F5C;&amp;#x7528;&amp;#x3002;&lt;br&gt;    &amp;#x5426;&amp;#x5219;&amp;#xFF0C;&amp;#x5982;&amp;#x679C; &amp;#xFF0A;this &amp;#x62E5;&amp;#x6709;&amp;#x4E00;&amp;#x4E2A;&amp;#x6307;&amp;#x9488; p &amp;#x548C;&amp;#x4E00;&amp;#x4E2A; deleter d&amp;#xFF0C;d(p) &amp;#x88AB;&amp;#x8C03;&amp;#x7528;&amp;#x3002;&lt;br&gt;    &amp;#x5426;&amp;#x5219;&amp;#xFF0C;&amp;#xFF0A;this &amp;#x62E5;&amp;#x6709;&amp;#x4E00;&amp;#x4E2A;&amp;#x6307;&amp;#x9488; p&amp;#xFF0C; delete p &amp;#x88AB;&amp;#x8C03;&amp;#x7528;&amp;#x3002;&lt;br&gt; &amp;#x629B;&amp;#x51FA;&amp;#xFF1A; &amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;&amp;#x8D4B;&amp;#x503C;&quot;&gt;&lt;a href=&quot;#&amp;#x8D4B;&amp;#x503C;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x8D4B;&amp;#x503C;&quot;&gt;&lt;/a&gt;&amp;#x8D4B;&amp;#x503C;&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;auto_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; shared_ptr(r).swap(*this)&amp;#x3002;&lt;br&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#xFF1A;&amp;#xFF0A;this&amp;#x3002;&lt;br&gt;&amp;#x6CE8;&amp;#x610F;&amp;#xFF1A;&amp;#x56E0;&amp;#x4E3A;&amp;#x4E34;&amp;#x65F6;&amp;#x5BF9;&amp;#x8C61;&amp;#x7684;&amp;#x6784;&amp;#x9020;&amp;#x4F1A;&amp;#x4F7F;&amp;#x5F97; use_count() &amp;#x66F4;&amp;#x65B0;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp;&amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp;&amp;amp; r); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;auto_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &amp;amp;&amp;amp; r);&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;unique_ptr&lt;/span&gt;&amp;lt;Y, D&amp;gt; &amp;amp;&amp;amp; r&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; shared_ptr( std::move(r) ).swap(*this)&amp;#x3002;&lt;br&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#xFF1A;&amp;#xFF0A;this&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; &lt;span class=&quot;keyword&quot;&gt;operator&lt;/span&gt;=(&lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;keyword&quot;&gt;nullptr_t&lt;/span&gt;); &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; shared_ptr().swap(*this)&amp;#x3002;&lt;br&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#xFF1A;&amp;#xFF0A;this&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;reset&quot;&gt;&lt;a href=&quot;#reset&quot; class=&quot;headerlink&quot; title=&quot;reset&quot;&gt;&lt;/a&gt;reset&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; shared_ptr().swap(*this)&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(Y * p)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; shared_ptr(p).swap(*this)&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(Y * p, D d)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; shared_ptr(p&amp;#xFF0C;d).swap(*this)&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; D, &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; A&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(Y * p, D d, A a)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; shared_ptr(p&amp;#xFF0C;d&amp;#xFF0C;s).swap(*this)&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;template&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; Y&amp;gt; &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;reset&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;Y&amp;gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt; &amp;amp; r, element_type * p)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x7B49;&amp;#x540C;&amp;#x4E8E; shared_ptr(r,p).swap(*this)&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;indirection&quot;&gt;&lt;a href=&quot;#indirection&quot; class=&quot;headerlink&quot; title=&quot;indirection&quot;&gt;&lt;/a&gt;indirection&lt;/h3&gt;&lt;h3 id=&quot;get&quot;&gt;&lt;a href=&quot;#get&quot; class=&quot;headerlink&quot; title=&quot;get&quot;&gt;&lt;/a&gt;get&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;element_type * &lt;span class=&quot;title&quot;&gt;get&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#xFF1A;&amp;#x5B58;&amp;#x50A8;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;unique&quot;&gt;&lt;a href=&quot;#unique&quot; class=&quot;headerlink&quot; title=&quot;unique&quot;&gt;&lt;/a&gt;unique&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;bool&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;unique&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#xFF1A;use_count() == 1&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;br&gt;&amp;#x6CE8;&amp;#x610F;&amp;#xFF1A;unique() &amp;#x6BD4; use_count() &amp;#x66F4;&amp;#x5FEB;&amp;#x3002;&amp;#x5982;&amp;#x679C;&amp;#x4F7F;&amp;#x7528; unique() &amp;#x6765;&amp;#x5B9E;&amp;#x73B0;&amp;#x5199;&amp;#x62F7;&amp;#x8D1D;&amp;#xFF0C;&amp;#x5F53;&amp;#x5B58;&amp;#x50A8;&amp;#x7684;&amp;#x6307;&amp;#x9488;&amp;#x4E3A; 0 &amp;#x65F6;&amp;#x4E0D;&amp;#x8981;&amp;#x4F9D;&amp;#x8D56;&amp;#x7279;&amp;#x5B9A;&amp;#x7684;&amp;#x503C;&amp;#x3002;&amp;#xFF08;&amp;#xFF1F;&amp;#xFF09;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;use-count&quot;&gt;&lt;a href=&quot;#use-count&quot; class=&quot;headerlink&quot; title=&quot;use_count&quot;&gt;&lt;/a&gt;use_count&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;long&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;use_count&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;const&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x8FD4;&amp;#x56DE;&amp;#xFF1A;&amp;#x5171;&amp;#x4EAB;&amp;#x6240;&amp;#x6709;&amp;#x6743;&amp;#x7684; shared_ptr &amp;#x7684;&amp;#x6570;&amp;#x91CF;&amp;#xFF0C;&amp;#x82E5; &amp;#xFF0A;this &amp;#x4E3A;&amp;#x7A7A;&amp;#x5219;&amp;#x4E3A; 0&amp;#x3002;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;br&gt;&amp;#x6CE8;&amp;#x610F;&amp;#xFF1A;use_count() &amp;#x4E0D;&amp;#x662F;&amp;#x9AD8;&amp;#x6548;&amp;#x7684;&amp;#xFF0C;&amp;#x53EA;&amp;#x662F;&amp;#x7528;&amp;#x6765;&amp;#x8C03;&amp;#x8BD5;&amp;#x548C;&amp;#x6D4B;&amp;#x8BD5;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h3 id=&quot;conversions&quot;&gt;&lt;a href=&quot;#conversions&quot; class=&quot;headerlink&quot; title=&quot;conversions&quot;&gt;&lt;/a&gt;conversions&lt;/h3&gt;&lt;h3 id=&quot;swap&quot;&gt;&lt;a href=&quot;#swap&quot; class=&quot;headerlink&quot; title=&quot;swap&quot;&gt;&lt;/a&gt;swap&lt;/h3&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;swap&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt; &amp;amp; b)&lt;/span&gt;&lt;/span&gt;; &lt;span class=&quot;comment&quot;&gt;// never throws&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;blockquote&gt;
&lt;p&gt;&amp;#x6548;&amp;#x679C;&amp;#xFF1A;&amp;#x4EA4;&amp;#x6362;&amp;#x4E24;&amp;#x4E2A;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5185;&amp;#x5BB9;&lt;br&gt;&amp;#x629B;&amp;#x51FA;&amp;#xFF1A;&amp;#x65E0;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;h2 id=&quot;Free-Functions&quot;&gt;&lt;a href=&quot;#Free-Functions&quot; class=&quot;headerlink&quot; title=&quot;Free Functions&quot;&gt;&lt;/a&gt;Free Functions&lt;/h2&gt;&lt;h2 id=&quot;Example&quot;&gt;&lt;a href=&quot;#Example&quot; class=&quot;headerlink&quot; title=&quot;Example&quot;&gt;&lt;/a&gt;Example&lt;/h2&gt;&lt;p&gt;&lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/example/shared_ptr_example.cpp&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;shared_ptr_example.cpp&lt;/a&gt; &amp;#x63D0;&amp;#x4F9B;&amp;#x4E86;&amp;#x4E00;&amp;#x4E2A;&amp;#x5B8C;&amp;#x6574;&amp;#x7684;&amp;#x4F8B;&amp;#x5B50;&amp;#xFF0C;&amp;#x8BE5;&amp;#x7A0B;&amp;#x5E8F;&amp;#x5305;&amp;#x542B;&amp;#x4E86; shared_ptr &amp;#x5BF9;&amp;#x8C61;&amp;#x7684; std::vector &amp;#x548C; std::set&amp;#x3002;&lt;br&gt;&amp;#x6CE8;&amp;#x610F;&amp;#x5BB9;&amp;#x5668;&amp;#x751F;&amp;#x6210;&amp;#x540E;&amp;#xFF0C;shared_ptr &amp;#x7684; use_count() &amp;#x4E3A; 2.&lt;/p&gt;
&lt;figure class=&quot;highlight&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;25&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;26&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;27&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;28&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;29&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;30&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;31&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;32&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;33&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;34&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;35&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;36&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;37&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;38&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;39&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;40&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;41&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;42&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;43&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;44&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;45&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;46&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;47&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;48&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;49&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;50&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;51&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;52&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;53&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;54&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;55&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;56&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;57&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;58&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;59&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;60&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;61&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;62&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;63&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;64&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;65&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;66&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;67&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;68&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;69&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;70&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;71&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;72&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;73&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;74&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;75&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;76&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;77&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  Boost shared_ptr_example.cpp  --------------------------------------------//&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  Copyright Beman Dawes 2001.  Distributed under the Boost&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  Software License, Version 1.0. (See accompanying file&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  See http://www.boost.org/libs/smart_ptr for documentation.&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  Revision History&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  21 May 01  Initial complete version (Beman Dawes)&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  The original code for this example appeared in the shared_ptr documentation.&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  Ray Gallimore pointed out that foo_set was missing a Compare template&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  argument, so would not work as intended.  At that point the code was&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  turned into an actual .cpp file so it could be compiled and tested.&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;#include &amp;lt;vector&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;#include &amp;lt;set&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;#include &amp;lt;iostream&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;#include &amp;lt;algorithm&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;#include &amp;lt;boost/shared_ptr.hpp&amp;gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  The application will produce a series of&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  objects of type Foo which later must be&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  accessed both by occurrence (std::vector)&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;//  and by ordering relationship (std::set).&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;struct Foo&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{ &lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  Foo( int _x ) : x(_x) {}&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  ~Foo() { std::cout &amp;lt;&amp;lt; &amp;quot;Destructing a Foo with x=&amp;quot; &amp;lt;&amp;lt; x &amp;lt;&amp;lt; &amp;quot;\n&amp;quot;; }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  int x;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  /* ... */&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;typedef boost::shared_ptr&amp;lt;Foo&amp;gt; FooPtr;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;struct FooPtrOps&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  bool operator()( const FooPtr &amp;amp; a, const FooPtr &amp;amp; b )&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    { return a-&amp;gt;x &amp;gt; b-&amp;gt;x; }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  void operator()( const FooPtr &amp;amp; a )&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;    { std::cout &amp;lt;&amp;lt; a-&amp;gt;x &amp;lt;&amp;lt; &amp;quot; &amp;quot; &amp;lt;&amp;lt; a.use_count() &amp;lt;&amp;lt; &amp;quot;\n&amp;quot;; }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;int main()&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  std::vector&amp;lt;FooPtr&amp;gt;         foo_vector;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  std::set&amp;lt;FooPtr,FooPtrOps&amp;gt;  foo_set; // NOT multiset!&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  FooPtr foo_ptr( new Foo( 2 ) );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_vector.push_back( foo_ptr );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_set.insert( foo_ptr );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_ptr.reset( new Foo( 1 ) );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_vector.push_back( foo_ptr );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_set.insert( foo_ptr );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_ptr.reset( new Foo( 3 ) );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_vector.push_back( foo_ptr );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_set.insert( foo_ptr );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_ptr.reset ( new Foo( 2 ) );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_vector.push_back( foo_ptr );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  foo_set.insert( foo_ptr );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  std::cout &amp;lt;&amp;lt; &amp;quot;foo_vector:\n&amp;quot;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  std::for_each( foo_vector.begin(), foo_vector.end(), FooPtrOps() );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  std::cout &amp;lt;&amp;lt; &amp;quot;\nfoo_set:\n&amp;quot;; &lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  std::for_each( foo_set.begin(), foo_set.end(), FooPtrOps() );&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  std::cout &amp;lt;&amp;lt; &amp;quot;\n&amp;quot;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  return 0;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x7F16;&amp;#x8BD1;&amp;#x8FD0;&amp;#x884C;&lt;/p&gt;
&lt;figure class=&quot;highlight stylus&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;g++ -g shared_ptr_example&lt;span class=&quot;selector-class&quot;&gt;.cpp&lt;/span&gt; -o shared_ptr_example&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;./shared_ptr_example&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;foo_vector:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;number&quot;&gt;2&lt;/span&gt; &lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;number&quot;&gt;1&lt;/span&gt; &lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;number&quot;&gt;3&lt;/span&gt; &lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;number&quot;&gt;2&lt;/span&gt; &lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;foo_set:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;number&quot;&gt;3&lt;/span&gt; &lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;number&quot;&gt;2&lt;/span&gt; &lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;number&quot;&gt;1&lt;/span&gt; &lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;Destructing &lt;span class=&quot;selector-tag&quot;&gt;a&lt;/span&gt; Foo with x=&lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;Destructing &lt;span class=&quot;selector-tag&quot;&gt;a&lt;/span&gt; Foo with x=&lt;span class=&quot;number&quot;&gt;3&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;Destructing &lt;span class=&quot;selector-tag&quot;&gt;a&lt;/span&gt; Foo with x=&lt;span class=&quot;number&quot;&gt;1&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;Destructing &lt;span class=&quot;selector-tag&quot;&gt;a&lt;/span&gt; Foo with x=&lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;h2 id=&quot;Handle-Body-Idiom&quot;&gt;&lt;a href=&quot;#Handle-Body-Idiom&quot; class=&quot;headerlink&quot; title=&quot;Handle/Body Idiom&quot;&gt;&lt;/a&gt;Handle/Body Idiom&lt;/h2&gt;&lt;p&gt;shared_ptr &amp;#x7684;&amp;#x4E00;&amp;#x4E2A;&amp;#x5E38;&amp;#x7528;&amp;#x5730;&amp;#x65B9;&amp;#x662F;&amp;#x5B9E;&amp;#x73B0;&amp;#x4E00;&amp;#x4E2A; handle/body (pimpl) idiom, &amp;#x5B83;&amp;#x53EF;&amp;#x4EE5;&amp;#x907F;&amp;#x514D;&amp;#x5934;&amp;#x6587;&amp;#x4EF6;&amp;#x4E2D;&amp;#x7C7B;&amp;#x7684;&amp;#x5177;&amp;#x4F53;&amp;#x5B9E;&amp;#x73B0;&amp;#x3002;&lt;br&gt;&lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/example/shared_ptr_example2_test.cpp&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;]shared_ptr_example2_test.cpp&lt;/a&gt; &amp;#x4F8B;&amp;#x5B50;&amp;#x5305;&amp;#x542B;&amp;#x4E86;&amp;#x4E00;&amp;#x4E2A;&amp;#x5934;&amp;#x6587;&amp;#x4EF6; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/example/shared_ptr_example2.hpp&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;shared_ptr_example2.hpp&lt;/a&gt;&amp;#xFF0C;&amp;#x8BE5;&amp;#x5934;&amp;#x6587;&amp;#x4EF6;&amp;#x5229;&amp;#x7528; shared_ptr &amp;#x53BB;&amp;#x9690;&amp;#x85CF;&amp;#x4E86;&amp;#x4E0D;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x7684;&amp;#x5177;&amp;#x4F53;&amp;#x5B9E;&amp;#x73B0;&amp;#x3002; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/example/shared_ptr_example2.cpp&quot; target=&quot;_blank&quot; rel=&quot;external&quot;&gt;shared_ptr_example2.cpp&lt;/a&gt; &amp;#x5219;&amp;#x5305;&amp;#x542B;&amp;#x4E86;&amp;#x5177;&amp;#x4F53;&amp;#x5B9E;&amp;#x73B0;&amp;#x3002;&amp;#x6CE8;&amp;#x610F;&amp;#x8FD9;&amp;#x91CC;&amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x4E00;&amp;#x4E2A; explicit &amp;#x7684;&amp;#x6790;&amp;#x6784;&amp;#x51FD;&amp;#x6570;&amp;#x3002;&amp;#x4E0E; ~scoped_ptr &amp;#x4E0D;&amp;#x540C;&amp;#xFF0C;~shared_ptr &amp;#x4E0D;&amp;#x9700;&amp;#x8981; T &amp;#x662F;&amp;#x5B8C;&amp;#x6574;&amp;#x7C7B;&amp;#x578B;&amp;#x3002;(?)&lt;/p&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;23&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;24&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;25&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;26&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;27&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;28&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;29&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;30&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Boost shared_ptr_example2 header file  -----------------------------------//&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Copyright Beman Dawes 2001.  Distributed under the Boost&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Software License, Version 1.0. (See accompanying file&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  See http://www.boost.org/libs/smart_ptr for documentation.&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;meta-string&quot;&gt;&amp;lt;boost/shared_ptr.hpp&amp;gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  This example demonstrates the handle/body idiom (also called pimpl and&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  several other names).  It separates the interface (in this header file)&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  from the implementation (in shared_ptr_example2.cpp).&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Note that even though example::implementation is an incomplete type in&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  some translation units using this header, shared_ptr&amp;lt; implementation &amp;gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  is still valid because the type is complete where it counts - in the&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  shared_ptr_example2.cpp translation unit where functions requiring a&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  complete type are actually instantiated.&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; example&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  example();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;do_something&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;private&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; implementation;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  boost::&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt; implementation &amp;gt; _imp; &lt;span class=&quot;comment&quot;&gt;// hide implementation details&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// Boost shared_ptr_example2 implementation file  -----------------------------//&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Copyright Beman Dawes 2001.  Distributed under the Boost&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Software License, Version 1.0. (See accompanying file&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  See http://www.boost.org/libs/smart_ptr for documentation.&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;string&quot;&gt;&amp;quot;shared_ptr_example2.hpp&amp;quot;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;meta-string&quot;&gt;&amp;lt;iostream&amp;gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;class&lt;/span&gt; example::implementation&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt; &lt;span class=&quot;keyword&quot;&gt;public&lt;/span&gt;:&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  ~implementation() { &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;cout&lt;/span&gt; &amp;lt;&amp;lt; &lt;span class=&quot;string&quot;&gt;&amp;quot;destroying implementation\n&amp;quot;&lt;/span&gt;; }&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;};&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;example::example() : _imp( &lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; implementation ) {}&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;void&lt;/span&gt; example::do_something()&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  { &lt;span class=&quot;built_in&quot;&gt;std&lt;/span&gt;::&lt;span class=&quot;built_in&quot;&gt;cout&lt;/span&gt; &amp;lt;&amp;lt; &lt;span class=&quot;string&quot;&gt;&amp;quot;use_count() is &amp;quot;&lt;/span&gt; &amp;lt;&amp;lt; _imp.use_count() &amp;lt;&amp;lt; &lt;span class=&quot;string&quot;&gt;&amp;quot;\n&amp;quot;&lt;/span&gt;; }&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;9&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;10&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;11&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;12&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;13&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;14&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;15&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;16&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;17&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;18&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;19&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;20&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;21&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;22&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// Boost shared_ptr_example2_test main program  ------------------------------//&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Copyright Beman Dawes 2001.  Distributed under the Boost&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  Software License, Version 1.0. (See accompanying file&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//  See http://www.boost.org/libs/smart_ptr for documentation.&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;meta&quot;&gt;#&lt;span class=&quot;meta-keyword&quot;&gt;include&lt;/span&gt; &lt;span class=&quot;string&quot;&gt;&amp;quot;shared_ptr_example2.hpp&amp;quot;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;function&quot;&gt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt; &lt;span class=&quot;title&quot;&gt;main&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;{&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  example a;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  a.do_something();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;function&quot;&gt;example &lt;span class=&quot;title&quot;&gt;b&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;(a)&lt;/span&gt;&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  b.do_something();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  example c;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  c = a;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  c.do_something();&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;  &lt;span class=&quot;keyword&quot;&gt;return&lt;/span&gt; &lt;span class=&quot;number&quot;&gt;0&lt;/span&gt;;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;}&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x7F16;&amp;#x8BD1;&amp;#x8FD0;&amp;#x884C;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;8&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;g++ -g shared_ptr_example2.cpp shared_ptr_example2_test.cpp -o shared_ptr_example2_test&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;./&lt;span class=&quot;function&quot;&gt;shared_ptr_example2_test&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;title&quot;&gt;use_count&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; is 1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;title&quot;&gt;use_count&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; is 2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;destroying implementation&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;title&quot;&gt;use_count&lt;/span&gt;&lt;span class=&quot;params&quot;&gt;()&lt;/span&gt; is 3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;destroying implementation&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;p&gt;&amp;#x8FD9;&amp;#x91CC;&amp;#x7B2C;&amp;#x4E00;&amp;#x4E2A; destroying implementation &amp;#x7684;&amp;#x8F93;&amp;#x51FA;&amp;#x662F;&amp;#x7531;&amp;#x4E8E; c &amp;#xFF1D; a &amp;#x8BED;&amp;#x53E5;&amp;#x5BFC;&amp;#x81F4; c &amp;#x4E2D;&amp;#x7684; _imp &amp;#x88AB;&amp;#x6790;&amp;#x6784;&amp;#x3002;&lt;/p&gt;
&lt;h2 id=&quot;Thread-Safety&quot;&gt;&lt;a href=&quot;#Thread-Safety&quot; class=&quot;headerlink&quot; title=&quot;Thread Safety&quot;&gt;&lt;/a&gt;Thread Safety&lt;/h2&gt;&lt;p&gt;shared_ptr &amp;#x5BF9;&amp;#x8C61;&amp;#x63D0;&amp;#x4F9B;&amp;#x4E86; C++ &amp;#x5185;&amp;#x5EFA;&amp;#x7C7B;&amp;#x578B;&amp;#x7684;&amp;#x7EBF;&amp;#x7A0B;&amp;#x5B89;&amp;#x5168;&amp;#x7EA7;&amp;#x522B;&amp;#x3002; shared_ptr &amp;#x5BF9;&amp;#x8C61;&amp;#x80FD;&amp;#x88AB;&amp;#x591A;&amp;#x4E2A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x540C;&amp;#x65F6;&amp;#x8BFB;&amp;#xFF0C;&amp;#x4E0D;&amp;#x540C;&amp;#x7684; shared_ptr &amp;#x5BF9;&amp;#x8C61;&amp;#x80FD;&amp;#x591F;&amp;#x88AB;&amp;#x591A;&amp;#x4E2A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x540C;&amp;#x65F6;&amp;#x5199;&amp;#xFF08;&amp;#x5373;&amp;#x4F7F;&amp;#x8FD9;&amp;#x4E9B;&amp;#x5BF9;&amp;#x8C61;&amp;#x662F;&amp;#x5171;&amp;#x4EAB;&amp;#x540C;&amp;#x4E00;&amp;#x4E2A;&amp;#x5F15;&amp;#x7528;&amp;#xFF09;&amp;#x3002;&lt;/p&gt;
&lt;p&gt;Example&amp;#xFF1A;&lt;br&gt;&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;&amp;gt; p(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;(&lt;span class=&quot;number&quot;&gt;42&lt;/span&gt;));&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;&lt;/p&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//--- Example 1 ---&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread A&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;&amp;gt; p2(p); &lt;span class=&quot;comment&quot;&gt;// reads p&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread B&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;built_in&quot;&gt;shared_ptr&lt;/span&gt;&amp;lt;&lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;&amp;gt; p3(p); &lt;span class=&quot;comment&quot;&gt;// OK, multiple reads are safe&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//--- Example 2 ---&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread A&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;p.reset(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;(&lt;span class=&quot;number&quot;&gt;1912&lt;/span&gt;)); &lt;span class=&quot;comment&quot;&gt;// writes p&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread B&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;p2.reset(); &lt;span class=&quot;comment&quot;&gt;// OK, writes p2&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//--- Example 3 ---&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread A&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;p = p3; &lt;span class=&quot;comment&quot;&gt;// reads p3, writes p&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread B&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;p3.reset(); &lt;span class=&quot;comment&quot;&gt;// writes p3; undefined, simultaneous read/write&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//--- Example 4 ---&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread A&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;p3 = p2; &lt;span class=&quot;comment&quot;&gt;// reads p2, writes p3&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread B&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// p2 goes out of scope: undefined, the destructor is considered a &amp;quot;write access&amp;quot;&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;figure class=&quot;highlight c++&quot;&gt;&lt;table&gt;&lt;tr&gt;&lt;td class=&quot;gutter&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;1&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;2&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;3&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;4&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;5&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;6&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;7&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;td class=&quot;code&quot;&gt;&lt;pre&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;//--- Example 5 ---&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread A&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;p3.reset(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;(&lt;span class=&quot;number&quot;&gt;1&lt;/span&gt;));&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;&lt;span class=&quot;comment&quot;&gt;// thread B&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;span class=&quot;line&quot;&gt;p3.reset(&lt;span class=&quot;keyword&quot;&gt;new&lt;/span&gt; &lt;span class=&quot;keyword&quot;&gt;int&lt;/span&gt;(&lt;span class=&quot;number&quot;&gt;2&lt;/span&gt;)); &lt;span class=&quot;comment&quot;&gt;// undefined, multiple writes&lt;/span&gt;&lt;/span&gt;&lt;br&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/figure&gt;
&lt;p&gt;&amp;#x4ECE; Boost release 1.33.0 &amp;#x5F00;&amp;#x59CB;&amp;#xFF0C;shared_ptr &amp;#x5728;&amp;#x5927;&amp;#x591A;&amp;#x5E73;&amp;#x53F0;&amp;#x4E0A;&amp;#x4F7F;&amp;#x7528;&amp;#x4E86;&amp;#x901A;&amp;#x7528;&amp;#x9501;&amp;#x7684;&amp;#x5B9E;&amp;#x73B0;&amp;#x3002;&lt;br&gt;&amp;#x5982;&amp;#x679C;&amp;#x4F60;&amp;#x7684;&amp;#x7A0B;&amp;#x5E8F;&amp;#x662F;&amp;#x5355;&amp;#x7EBF;&amp;#x7A0B;&amp;#x7684;&amp;#xFF0C;&amp;#x5E76;&amp;#x4E14;&amp;#x4E0D;&amp;#x9700;&amp;#x8981;&amp;#x94FE;&amp;#x63A5;&amp;#x4F7F;&amp;#x7528;&amp;#x4E86; shared_ptr &amp;#x7684;&amp;#x5E93;&amp;#xFF0C;&amp;#x4F60;&amp;#x53EF;&amp;#x4EE5;&amp;#x4F7F;&amp;#x7528;&amp;#x5B8F;&amp;#x5B9A;&amp;#x4E49; &amp;#xFF03;define BOOST_SP_DISABLE_THREADS &amp;#x6765;&amp;#x5207;&amp;#x6362;&amp;#x5230;&amp;#x666E;&amp;#x901A;&amp;#x975E;&amp;#x539F;&amp;#x5B50;&amp;#x7684;&amp;#x5F15;&amp;#x7528;&amp;#x8BA1;&amp;#x6570;&amp;#x66F4;&amp;#x65B0;&amp;#x3002;&lt;br&gt;&amp;#x4F60;&amp;#x80FD;&amp;#x5B9A;&amp;#x4E49;&amp;#x5B8F; BOOST_SP_USE_PTHREADS &amp;#x6765;&amp;#x5173;&amp;#x95ED;&amp;#x901A;&amp;#x7528;&amp;#x9501;&amp;#xFF0C;&amp;#x5207;&amp;#x6362;&amp;#x56DE;&amp;#x4F7F;&amp;#x7528;&amp;#x666E;&amp;#x901A;&amp;#x7684; pthread_mutex_t &amp;#x7684;&amp;#x4EE3;&amp;#x7801;&amp;#x3002;&lt;/p&gt;
</content>

    <summary type="html">

      &lt;blockquote&gt;
&lt;p&gt;&amp;#x6700;&amp;#x8FD1;&amp;#x5728;&amp;#x770B;&amp;#x9648;&amp;#x7855;&amp;#x7684;&amp;#x300A;Linux&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x670D;&amp;#x52A1;&amp;#x7AEF;&amp;#x7F16;&amp;#x7A0B;&amp;#xFF1A;&amp;#x4F7F;&amp;#x7528;muduo C++&amp;#x7F51;&amp;#x7EDC;&amp;#x5E93;&amp;#x300B;&amp;#xFF0C;&amp;#x7B2C;&amp;#x4E00;&amp;#x7AE0;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x8BB2;&amp;#x4E86;&amp;#x591A;&amp;#x7EBF;&amp;#x7A0B;&amp;#x4E0B;&amp;#x6307;&amp;#x9488;&amp;#x7684;&amp;#x5904;&amp;#x7406;&amp;#x95EE;&amp;#x9898;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x91CD;&amp;#x70B9;&amp;#x662F; shared_ptr &amp;#x4E0E; weak_ptr, &amp;#x4F46;&amp;#x4E66;&amp;#x4E2D;&amp;#x5BF9;&amp;#x8FD9;&amp;#x90E8;&amp;#x5206;&amp;#x7684;&amp;#x57FA;&amp;#x7840;&amp;#x4ECB;&amp;#x7ECD;&amp;#x6BD4;&amp;#x8F83;&amp;#x7B80;&amp;#x7565;&amp;#xFF0C;&amp;#x4EE5;&amp;#x524D;&amp;#x770B;&amp;#x8FC7;&amp;#x667A;&amp;#x80FD;&amp;#x6307;&amp;#x9488;&amp;#xFF0C;&amp;#x4F46;&amp;#x4E00;&amp;#x76F4;&amp;#x6CA1;&amp;#x6709;&amp;#x5B8C;&amp;#x6574;&amp;#x5B66;&amp;#x4E60;&amp;#x8FC7;&amp;#xFF0C;&amp;#x56E0;&amp;#x800C;&amp;#x5B66;&amp;#x4E60;&amp;#x7FFB;&amp;#x8BD1;&amp;#x4E86;&amp;#x5B98;&amp;#x65B9;&amp;#x7684;&amp;#x6587;&amp;#x6863;&amp;#x8FDB;&amp;#x884C;&amp;#x5B66;&amp;#x4E60;&amp;#x3002;&amp;#x4EE5;&amp;#x4E0B;&amp;#x662F; &lt;a href=&quot;http://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/shared_ptr.htm&quot;&gt;boost::shared_ptr&lt;/a&gt; &amp;#x7684;&amp;#x4E2D;&amp;#x6587;&amp;#x7FFB;&amp;#x8BD1;&amp;#xFF0C;&amp;#x5176;&amp;#x4E2D;&amp;#x4E00;&amp;#x90E8;&amp;#x5206;&amp;#x611F;&amp;#x89C9;&amp;#x4E0D;&amp;#x662F;&amp;#x5F88;&amp;#x91CD;&amp;#x8981;&amp;#x7684;&amp;#x8FD9;&amp;#x91CC;&amp;#x6682;&amp;#x65F6;&amp;#x6CA1;&amp;#x6709;&amp;#x7ED9;&amp;#x51FA;&amp;#x7FFB;&amp;#x8BD1;&amp;#x3002; &lt;/p&gt;
&lt;/blockquote&gt;

    </summary>

      <category term="Unix/Linux" scheme="http://deyituo.github.io/categories/Unix-Linux/"/>


      <category term="shared_ptr" scheme="http://deyituo.github.io/tags/shared-ptr/"/>

      <category term="C++" scheme="http://deyituo.github.io/tags/C/"/>

      <category term="boost" scheme="http://deyituo.github.io/tags/boost/"/>

  </entry>

  <entry>
    <title>人脸检测算法概述</title>
    <link href="http://deyituo.github.io/2016/06/07/%E4%BA%BA%E8%84%B8%E6%A3%80%E6%B5%8B%E7%AE%97%E6%B3%95%E6%A6%82%E8%BF%B0/"/>
    <id>http://deyituo.github.io/2016/06/07/人脸检测算法概述/</id>
    <published>2016-06-07T12:31:29.000Z</published>
    <updated>2016-06-11T09:23:04.000Z</updated>

    <content type="html">&lt;blockquote&gt;
&lt;p&gt;&amp;#x505A;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x5DF2;&amp;#x7ECF;&amp;#x4E00;&amp;#x6BB5;&amp;#x65F6;&amp;#x95F4;&amp;#x4E86;&amp;#xFF0C;&amp;#x4E34;&amp;#x8FD1;&amp;#x6BD5;&amp;#x4E1A;&amp;#x60F3;&amp;#x60F3;&amp;#x5DE5;&amp;#x4F5C;&amp;#x540E;&amp;#x4F30;&amp;#x8BA1;&amp;#x5E94;&amp;#x8BE5;&amp;#x4E0D;&amp;#x4F1A;&amp;#x6709;&amp;#x592A;&amp;#x591A;&amp;#x65F6;&amp;#x95F4;&amp;#x518D;&amp;#x6765;&amp;#x641E;&amp;#x8FD9;&amp;#x4E2A;&amp;#xFF0C;&amp;#x4E0B;&amp;#x9762;&amp;#x62BD;&amp;#x53D6;&amp;#x4E86;&amp;#x6BD5;&amp;#x4E1A;&amp;#x8BBA;&amp;#x6587;&amp;#x7684;&amp;#x7B2C;&amp;#x4E8C;&amp;#x7AE0;&amp;#x5BF9;&amp;#x4EE5;&amp;#x524D;&amp;#x770B;&amp;#x8FC7;&amp;#x7684;&amp;#x8BBA;&amp;#x6587;&amp;#x8FDB;&amp;#x884C;&amp;#x4E86;&amp;#x603B;&amp;#x7ED3;&amp;#xFF0C;&amp;#x5199;&amp;#x6210;&amp;#x4E86;&amp;#x4E0B;&amp;#x9762;&amp;#x7684;&amp;#x7EFC;&amp;#x8FF0;&amp;#xFF0C;&amp;#x6DB5;&amp;#x76D6;&amp;#x5230;&amp;#x6BD4;&amp;#x8F83;&amp;#x591A;&amp;#x7684;&amp;#x65B9;&amp;#x6CD5;&amp;#xFF0C;&amp;#x5E0C;&amp;#x671B;&amp;#x5BF9;&amp;#x770B;&amp;#x5230;&amp;#x8FD9;&amp;#x7BC7;&amp;#x6587;&amp;#x7AE0;&amp;#x7684;&amp;#x7814;&amp;#x7A76;&amp;#x8005;&amp;#x4F1A;&amp;#x6709;&amp;#x6240;&amp;#x5E2E;&amp;#x52A9;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;
&lt;a id=&quot;more&quot;&gt;&lt;/a&gt;
&lt;p&gt;&amp;#x81EA; 2001 &amp;#x5E74; Viola &amp;#x548C; Jones &lt;a href=&quot;#1&quot;&gt;[1]&lt;/a&gt; &amp;#x5C06;&amp;#x7EA7;&amp;#x8054;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x7684;&amp;#x6982;&amp;#x5FF5;&amp;#x5F15;&amp;#x5165;&amp;#x5230;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x9886;&amp;#x57DF;&amp;#xFF0C; &amp;#x5176;&amp;#x540E;&amp;#x53D1;&amp;#x5C55;&amp;#x8D77;&amp;#x6765;&amp;#x7684;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x7B97;&amp;#x6CD5;&amp;#x88AB;&amp;#x8BBE;&amp;#x8BA1;&amp;#x6210;&amp;#x66F4;&amp;#x597D;&amp;#x5730;&amp;#x5904;&amp;#x7406;&amp;#x591A;&amp;#x89D2;&amp;#x5EA6;&amp;#x68C0;&amp;#x6D4B;&amp;#xFF0C; &amp;#x906E;&amp;#x6321;&amp;#xFF0C; &amp;#x6A21;&amp;#x7CCA;&amp;#x7B49;&amp;#x95EE;&amp;#x9898; &lt;a href=&quot;#15&quot;&gt;[15]&lt;/a&gt;&lt;a href=&quot;#16&quot;&gt;[16]&lt;/a&gt;&amp;#x3002; &amp;#x8FD9;&amp;#x4E9B;&amp;#x7B97;&amp;#x6CD5;&amp;#x4E3B;&amp;#x8981;&amp;#x6709;&amp;#x4E09;&amp;#x5927;&amp;#x7C7B;&amp;#x5206;&amp;#x652F;&amp;#xFF0C; 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&lt;p&gt;Viola &amp;#x548C; Jones &amp;#x6210;&amp;#x529F;&amp;#x5C06; AdaBoost &amp;#x673A;&amp;#x5668;&amp;#x5B66;&amp;#x4E60;&amp;#x65B9;&amp;#x6CD5; &lt;a href=&quot;#22&quot;&gt;[22]&lt;/a&gt; &amp;#x5F15;&amp;#x5165;&amp;#x5230;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x4E2D;&amp;#xFF0C; &amp;#x5728;&amp;#x6587;&amp;#x732E; &lt;a href=&quot;#1&quot;&gt;[1]&lt;/a&gt;&lt;a href=&quot;#2&quot;&gt;[2]&lt;/a&gt; &amp;#x4E2D;&amp;#x91C7;&amp;#x7528; Haar &amp;#x7279;&amp;#x5F81;&amp;#x8FDB;&amp;#x884C;&amp;#x4EBA;&amp;#x8138;&amp;#x7279;&amp;#x5F81;&amp;#x8868;&amp;#x8FBE;&amp;#xFF0C; &amp;#x7279;&amp;#x5F81;&amp;#x8868;&amp;#x8FBE;&amp;#x7B80;&amp;#x5355;&amp;#xFF0C; &amp;#x5982;&amp;#x56FE; 2-2(a)&amp;#x3002; &amp;#x63D0;&amp;#x51FA;&amp;#x7684;&amp;#x79EF;&amp;#x5206;&amp;#x56FE;&amp;#x6982;&amp;#x5FF5;&amp;#xFF0C; &amp;#x8FDB;&amp;#x4E00;&amp;#x6B65;&amp;#x52A0;&amp;#x5FEB;&amp;#x4E86;&amp;#x7279;&amp;#x5F81;&amp;#x63D0;&amp;#x53D6;&amp;#x6548;&amp;#x7387;&amp;#xFF0C; &amp;#x7136;&amp;#x540E;&amp;#x901A;&amp;#x8FC7; $ 20 $ &amp;#x5C42; AdaBoost &amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x5FEB;&amp;#x901F;&amp;#x8FC7;&amp;#x6EE4;&amp;#x6389;&amp;#x975E;&amp;#x4EBA;&amp;#x8138;&amp;#x533A;&amp;#x57DF;&amp;#x3002; &amp;#x7ECF;&amp;#x5178;&amp;#x7684;&amp;#x7EA7;&amp;#x8054; AdaBoost &amp;#x7B97;&amp;#x6CD5;&amp;#x91C7;&amp;#x7528;&amp;#x5355;&amp;#x5C42;&amp;#x51B3;&amp;#x7B56;&amp;#x6811;&amp;#xFF08;stump&amp;#xFF09;&amp;#x4F5C;&amp;#x4E3A;&amp;#x5F31;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x3002; &amp;#x8BAD;&amp;#x7EC3;&amp;#x65F6;&amp;#xFF0C; &amp;#x5F31;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x7684;&amp;#x52A0;&amp;#x6743;&amp;#x9519;&amp;#x8BEF;&amp;#x4E3A;&amp;#xFF1A;&lt;/p&gt;
&lt;p&gt;$$ \epsilon_i = min \sum_j w_j|h(x_i)-y_i|   $$&lt;/p&gt;
&lt;p&gt;&amp;#x5176;&amp;#x4E2D;&amp;#xFF0C; $ \epsilon_i $ &amp;#x4E3A;&amp;#x7B2C;&amp;#x4E2A;&amp;#x5F31;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x7684;&amp;#x5206;&amp;#x7C7B;&amp;#x9519;&amp;#x8BEF;&amp;#xFF0C; $ w_j $ &amp;#x4E3A;&amp;#x8BAD;&amp;#x7EC3;&amp;#x6837;&amp;#x672C;&amp;#x7684;&amp;#x6743;&amp;#x91CD;&amp;#xFF0C;$ y_i \in [1,0] $ &amp;#x8868;&amp;#x793A;&amp;#x6837;&amp;#x672C;&amp;#x4E3A;&amp;#x4EBA;&amp;#x8138;&amp;#x4E0E;&amp;#x975E;&amp;#x4EBA;&amp;#x8138;&amp;#xFF0C; $ h(x_i) $ &amp;#x4E3A;&amp;#x5F53;&amp;#x524D;&amp;#x5F31;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x5BF9;&amp;#x6837;&amp;#x672C; $ x_i $ &amp;#x7684;&amp;#x8F93;&amp;#x51FA;&amp;#x5F97;&amp;#x5206;&amp;#x3002; &amp;#x6BCF;&amp;#x6B21;&amp;#x8BAD;&amp;#x7EC3;&amp;#x5F97;&amp;#x5230;&amp;#x4E00;&amp;#x4E2A;&amp;#x5F31;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x90FD;&amp;#x4F1A;&amp;#x5BF9;&amp;#x8BAD;&amp;#x7EC3;&amp;#x6837;&amp;#x672C;&amp;#x7684;&amp;#x6743;&amp;#x91CD;&amp;#x91CD;&amp;#x65B0;&amp;#x8FDB;&amp;#x884C;&amp;#x8C03;&amp;#x6574;&amp;#xFF0C; &amp;#x964D;&amp;#x4F4E;&amp;#x5206;&amp;#x7C7B;&amp;#x6B63;&amp;#x786E;&amp;#x7684;&amp;#x6837;&amp;#x672C;&amp;#x7684;&amp;#x6743;&amp;#x91CD;&amp;#xFF0C; &amp;#x5206;&amp;#x7C7B;&amp;#x9519;&amp;#x8BEF;&amp;#x7684;&amp;#x6837;&amp;#x672C;&amp;#x5219;&amp;#x4E0E;&amp;#x4E4B;&amp;#x76F8;&amp;#x53CD;&amp;#xFF0C; &amp;#x4ECE;&amp;#x800C;&amp;#x4F7F;&amp;#x5F97;&amp;#x540E;&amp;#x7EED;&amp;#x7684;&amp;#x5F31;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x9488;&amp;#x5BF9;&amp;#x5206;&amp;#x7C7B;&amp;#x9519;&amp;#x8BEF;&amp;#x7684;&amp;#x6837;&amp;#x672C;&amp;#x3002;&lt;/p&gt;
&lt;p&gt;&amp;#x68C0;&amp;#x6D4B;&amp;#x65F6;&amp;#xFF0C; &amp;#x7A97;&amp;#x53E3; $ x $ &amp;#x7ECF;&amp;#x8FC7;&amp;#x7531;&amp;#x82E5;&amp;#x5E72;&amp;#x4E2A;&amp;#x5F31;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x7EC4;&amp;#x6210;&amp;#x7684; AdaBoost &amp;#x5F3A;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x8F93;&amp;#x51FA;&amp;#x4E3A;:&lt;/p&gt;
&lt;p&gt;$$  C(x) = \begin{cases} 1, \sum_{i}^{T} \alpha_i h_i(x) \gt  \eta \\ 0, otherwise \end{cases} , &amp;#x5176;&amp;#x4E2D; \alpha_i = log\frac{1-\epsilon_i}{\epsilon_i}  $$&lt;/p&gt;
&lt;p&gt;&amp;#x5176;&amp;#x4E2D; $ \eta $ &amp;#x4E3A;&amp;#x4FDD;&amp;#x8BC1;&amp;#x8D1F;&amp;#x6837;&amp;#x672C;&amp;#x901A;&amp;#x8FC7;&amp;#x8BE5;&amp;#x5F3A;&amp;#x5206;&amp;#x7C7B;&amp;#x5668;&amp;#x6982;&amp;#x7387;&amp;#x81F3;&amp;#x591A;&amp;#x4E3A; $ p_f $&amp;#xFF0C; &amp;#x6B63;&amp;#x6837;&amp;#x672C;&amp;#x901A;&amp;#x8FC7;&amp;#x6982;&amp;#x7387;&amp;#x81F3;&amp;#x5C11;&amp;#x4E3A;&amp;#x7684;&amp;#x9608;&amp;#x503C; $ p_t $(&amp;#x5982; $ p_f = 0.5, p_t = 0.95 $)&amp;#xFF0C; &amp;#x7ECF;&amp;#x8FC7; $ 20 $ &amp;#x5C42;&amp;#x540E;&amp;#xFF0C; &amp;#x6B63;&amp;#x3001;&amp;#x8D1F;&amp;#x6837;&amp;#x672C;&amp;#x901A;&amp;#x8FC7;&amp;#x6240;&amp;#x6709;&amp;#x5C42;&amp;#x7684;&amp;#x6982;&amp;#x7387;&amp;#x5206;&amp;#x522B;&amp;#x4E3A; $ 0.95^{20} &amp;gt; 0.9, 0.5^{20}&amp;lt; 10^{-6} $&amp;#x3002;&lt;/p&gt;
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&lt;p&gt;&amp;#x56FE;&amp;#x50CF;&amp;#x50CF;&amp;#x7D20;&amp;#x76F8;&amp;#x90BB;&amp;#x4F4D;&amp;#x7F6E;&amp;#x5177;&amp;#x6709;&amp;#x5F88;&amp;#x5F3A;&amp;#x7684;&amp;#x76F8;&amp;#x5173;&amp;#x6027;&amp;#xFF0C; &amp;#x5BF9;&amp;#x8FD9;&amp;#x4E9B;&amp;#x4F4D;&amp;#x7F6E;&amp;#x63D0;&amp;#x53D6;&amp;#x7684;&amp;#x7279;&amp;#x5F81;&amp;#x8868;&amp;#x8FBE;&amp;#x6027;&amp;#x66F4;&amp;#x5F3A;&amp;#xFF0C; &amp;#x5377;&amp;#x79EF;&amp;#x795E;&amp;#x7ECF;&amp;#x7F51;&amp;#x7EDC;&amp;#x4F7F;&amp;#x7528;&amp;#x5377;&amp;#x79EF;&amp;#x5C42;&amp;#x5B9E;&amp;#x73B0;&amp;#x8FD9;&amp;#x4E00;&amp;#x529F;&amp;#x80FD;&amp;#xFF0C; &amp;#x5377;&amp;#x79EF;&amp;#x5C42;&amp;#x5982;&amp;#x56FE; 2-5 &amp;#x6240;&amp;#x793A;&amp;#x3002; &amp;#x5377;&amp;#x79EF;&amp;#x5C42;&amp;#x5305;&amp;#x542B;&amp;#x4E00;&amp;#x7EC4;&amp;#x5377;&amp;#x79EF;&amp;#x6838;&amp;#xFF0C; &amp;#x6BCF;&amp;#x4E2A;&amp;#x5377;&amp;#x79EF;&amp;#x6838;&amp;#x4F5C;&amp;#x7528;&amp;#x4E8E;&amp;#x524D;&amp;#x4E00;&amp;#x5C42;&amp;#x7684;&amp;#x7279;&amp;#x5F81;&amp;#x56FE;&amp;#x4E0A;&amp;#xFF0C; &amp;#x4E0A;&amp;#x4E00;&amp;#x5C42;&amp;#x7279;&amp;#x5F81;&amp;#x56FE;&amp;#x7684;&amp;#x52A0;&amp;#x6743;&amp;#x548C;&amp;#x5F97;&amp;#x5230;&amp;#x4E0B;&amp;#x4E00;&amp;#x5C42;&amp;#x7684;&amp;#x7279;&amp;#x5F81;&amp;#x56FE;&amp;#xFF0C; &amp;#x5377;&amp;#x79EF;&amp;#x6838;&amp;#x7C7B;&amp;#x4F3C;&amp;#x6EE4;&amp;#x6CE2;&amp;#x64CD;&amp;#x4F5C;&amp;#x3002; &amp;#x5377;&amp;#x79EF;&amp;#x5C42;&amp;#x662F;&amp;#x4E00;&amp;#x79CD;&amp;#x5C40;&amp;#x90E8;&amp;#x8FDE;&amp;#x63A5;&amp;#xFF0C; &amp;#x5927;&amp;#x5927;&amp;#x51CF;&amp;#x5C11;&amp;#x4E86;&amp;#x5168;&amp;#x8FDE;&amp;#x63A5; (fully connected) &amp;#x5C42;&amp;#x7684;&amp;#x53C2;&amp;#x6570;&amp;#x6570;&amp;#x76EE;&amp;#x3002; &amp;#x5229;&amp;#x7528; ReLU &amp;#x4F5C;&amp;#x4E3A;&amp;#x6FC0;&amp;#x6D3B;&amp;#x51FD;&amp;#x6570;&amp;#xFF0C; &amp;#x5219;&amp;#x5377;&amp;#x79EF;&amp;#x5C42;&amp;#x7279;&amp;#x5F81;&amp;#x56FE;&amp;#x8F93;&amp;#x51FA;&amp;#x4E3A;&amp;#xFF1A;&lt;/p&gt;
&lt;p&gt;$$ h_i = max(0, \sum_k f_k*w_i ) $$&lt;/p&gt;
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&lt;p&gt;&amp;#x9075;&amp;#x5FAA; coarse-to-fine &amp;#x539F;&amp;#x5219;&amp;#x662F;&amp;#x5F53;&amp;#x524D;&amp;#x57FA;&amp;#x4E8E;&amp;#x6DF1;&amp;#x5EA6;&amp;#x5377;&amp;#x79EF;&amp;#x7F51;&amp;#x7EDC;&amp;#x7684;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x7B97;&amp;#x6CD5;&amp;#x7684;&amp;#x91CD;&amp;#x8981;&amp;#x53D1;&amp;#x5C55;&amp;#x8D8B;&amp;#x52BF;&amp;#x3002; &amp;#x57FA;&amp;#x4E8E;&amp;#x7EA7;&amp;#x8054;&amp;#x7ED3;&amp;#x6784;&amp;#x7684;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x7B97;&amp;#x6CD5; &lt;a href=&quot;#39&quot;&gt;[39]&lt;/a&gt; &amp;#x5728;&amp;#x68C0;&amp;#x6D4B;&amp;#x4EBA;&amp;#x8138;&amp;#x540C;&amp;#x65F6;&amp;#x8FDB;&amp;#x884C;&amp;#x4EBA;&amp;#x8138;&amp;#x6807;&amp;#x5B9A;&amp;#x70B9;&amp;#x62DF;&amp;#x5408;&amp;#x6765;&amp;#x53D6;&amp;#x5F97;&amp;#x66F4;&amp;#x597D;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x6846;&amp;#x4F4D;&amp;#x7F6E;&amp;#xFF0C; &amp;#x6587;&amp;#x732E;&lt;a href=&quot;#55&quot;&gt;[55]&lt;/a&gt; &amp;#x5219;&amp;#x63D0;&amp;#x51FA;&amp;#x4E86;&amp;#x57FA;&amp;#x4E8E;&amp;#x7EA7;&amp;#x8054;&amp;#x7ED3;&amp;#x6784;&amp;#x7684;&amp;#x5377;&amp;#x79EF;&amp;#x7F51;&amp;#x7EDC;&amp;#x7B97;&amp;#x6CD5;&amp;#x3002; &amp;#x8BE5;&amp;#x7B97;&amp;#x6CD5;&amp;#x540C;&amp;#x6837;&amp;#x5728;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x65F6;&amp;#x8003;&amp;#x8651;&amp;#x5230;&amp;#x4EBA;&amp;#x8138;&amp;#x77EB;&amp;#x6B63;&amp;#x4EE5;&amp;#x83B7;&amp;#x5F97;&amp;#x66F4;&amp;#x9AD8;&amp;#x6027;&amp;#x80FD;&amp;#xFF0C; &amp;#x5171;&amp;#x6709;&amp;#x4E09;&amp;#x4E2A;&amp;#x9636;&amp;#x6BB5;&amp;#xFF0C;&amp;#x6BCF;&amp;#x4E2A;&amp;#x9636;&amp;#x6BB5;&amp;#x5747;&amp;#x5305;&amp;#x542B;&amp;#x6709;&amp;#x4E00;&amp;#x4E2A;&amp;#x7684;&amp;#x68C0;&amp;#x6D4B;&amp;#x7F51;&amp;#x7EDC;&amp;#xFF0C; &amp;#x540E;&amp;#x4E00;&amp;#x9636;&amp;#x6BB5;&amp;#x6BD4;&amp;#x524D;&amp;#x4E00;&amp;#x9636;&amp;#x6BB5;&amp;#x7F51;&amp;#x7EDC;&amp;#x8981;&amp;#x66F4;&amp;#x5927;&amp;#xFF0C; &amp;#x5206;&amp;#x7C7B;&amp;#x6027;&amp;#x80FD;&amp;#x66F4;&amp;#x5F3A;&amp;#x3002; &amp;#x6BCF;&amp;#x4E2A;&amp;#x9636;&amp;#x6BB5;&amp;#x7684;&amp;#x7F51;&amp;#x7EDC;&amp;#x8F93;&amp;#x51FA;&amp;#x4F1A;&amp;#x7ECF;&amp;#x8FC7;&amp;#x5C3A;&amp;#x5EA6;&amp;#x3001;&amp;#x957F;&amp;#x5BBD;&amp;#x3001;&amp;#x4F4D;&amp;#x7F6E;&amp;#x8C03;&amp;#x6574;&amp;#x4EA7;&amp;#x751F;&amp;#x82E5;&amp;#x5E72;&amp;#x4E2A;&amp;#x5019;&amp;#x9009;&amp;#x533A;&amp;#x57DF;&amp;#x518D;&amp;#x6B21;&amp;#x8FDB;&amp;#x884C;&amp;#x68C0;&amp;#x6D4B;&amp;#xFF0C; &amp;#x4FDD;&amp;#x7559;&amp;#x5F97;&amp;#x5206;&amp;#x6BD4;&amp;#x8F83;&amp;#x597D;&amp;#x7684;&amp;#x533A;&amp;#x57DF;&amp;#x4F5C;&amp;#x4E3A;&amp;#x4E0B;&amp;#x4E00;&amp;#x9636;&amp;#x6BB5;&amp;#x7684;&amp;#x8F93;&amp;#x5165;&amp;#xFF0C; &amp;#x4EE5;&amp;#x6B64;&amp;#x5C06;&amp;#x8FD9;&amp;#x4E9B;&amp;#x533A;&amp;#x57DF;&amp;#x9010;&amp;#x6E10;&amp;#x8C03;&amp;#x6574;&amp;#x5230;&amp;#x66F4;&amp;#x7CBE;&amp;#x786E;&amp;#x7684;&amp;#x4EBA;&amp;#x8138;&amp;#x4F4D;&amp;#x7F6E;&amp;#x4E0A;&amp;#x3002; Yang&amp;#x7B49;&amp;#x4EBA;&lt;a href=&quot;#56&quot;&gt;[56]&lt;/a&gt; &amp;#x91C7;&amp;#x7528;&amp;#x4E0E;&amp;#x6587;&amp;#x732E; &lt;a href=&quot;#46&quot;&gt;[46]&lt;/a&gt; &amp;#x76F8;&amp;#x4F3C;&amp;#x7684;&amp;#x7B56;&amp;#x7565;&amp;#xFF0C; &amp;#x63D0;&amp;#x51FA;&amp;#x4E86;&amp;#x53CC;&amp;#x9636;&amp;#x6BB5;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x5668;&amp;#xFF0C; &amp;#x4F46;&amp;#x6DF1;&amp;#x5EA6;&amp;#x8981;&amp;#x66F4;&amp;#x52A0;&amp;#x6DF1;&amp;#xFF0C; &amp;#x5BF9;&amp;#x6BCF;&amp;#x4E2A;&amp;#x4EBA;&amp;#x8138;&amp;#x90E8;&amp;#x4F4D;&amp;#x751F;&amp;#x6210;&amp;#x54CD;&amp;#x5E94;&amp;#x56FE;&amp;#x8FC7;&amp;#x6EE4;&amp;#x5F97;&amp;#x5206;&amp;#x8FC7;&amp;#x4F4E;&amp;#x7684;&amp;#x4EBA;&amp;#x8138;&amp;#x5019;&amp;#x9009;&amp;#x533A;&amp;#x57DF;&amp;#xFF0C; &amp;#x5982;&amp;#x56FE; 2-8&amp;#xFF0C; &amp;#x5E76;&amp;#x901A;&amp;#x8FC7;&amp;#x63A5;&amp;#x5728;&amp;#x5176;&amp;#x540E;&amp;#x7684;&amp;#x68C0;&amp;#x6D4B;&amp;#x7F51;&amp;#x7EDC;&amp;#x5F97;&amp;#x5230;&amp;#x5BF9;&amp;#x5019;&amp;#x9009;&amp;#x533A;&amp;#x57DF;&amp;#x8FDB;&amp;#x884C;&amp;#x66F4;&amp;#x52A0;&amp;#x4E25;&amp;#x683C;&amp;#x7684;&amp;#x5206;&amp;#x7C7B;&amp;#x4E0E;&amp;#x8C03;&amp;#x6574;&amp;#x3002;&lt;/p&gt;
&lt;center&gt;&lt;img src=&quot;/2016/06/07/&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x7B97;&amp;#x6CD5;&amp;#x6982;&amp;#x8FF0;/10.png&quot; alt=&quot; &amp;#x5206;&amp;#x5E03;&amp;#x5F0F;&amp;#x7279;&amp;#x5F81;&amp;#x8868;&amp;#x793A;&amp;#x65B9;&amp;#x5F0F; &quot;&gt; &amp;#x56FE;2-8 &amp;#x4EBA;&amp;#x8138;&amp;#x90E8;&amp;#x4F4D;&amp;#x54CD;&amp;#x5E94;&amp;#x56FE;&amp;#x3002; &amp;#x5DE6;&amp;#x4E0A;&amp;#x89D2;&amp;#x4E3A;&amp;#x539F;&amp;#x56FE;&amp;#xFF0C;&amp;#x4ECE;&amp;#x5DE6;&amp;#x5230;&amp;#x53F3;&amp;#x4ECE;&amp;#x4E0A;&amp;#x5230;&amp;#x4E0B;&amp;#x5206;&amp;#x522B;&amp;#x4E3A;&amp;#x8BE5;&amp;#x56FE;&amp;#x5934;&amp;#x53D1;&amp;#x3001;&amp;#x773C;&amp;#x775B;&amp;#x3001;&amp;#x9F3B;&amp;#x5B50;&amp;#x3001;&amp;#x5634;&amp;#x5DF4;&amp;#x3001;&amp;#x4E0B;&amp;#x5DF4;&amp;#x7684;&amp;#x54CD;&amp;#x5E94;&amp;#x56FE;&lt;br&gt;&lt;br&gt;&lt;/center&gt;

&lt;h2 id=&quot;&amp;#x5C0F;&amp;#x7ED3;&quot;&gt;&lt;a href=&quot;#&amp;#x5C0F;&amp;#x7ED3;&quot; class=&quot;headerlink&quot; title=&quot;&amp;#x5C0F;&amp;#x7ED3;&quot;&gt;&lt;/a&gt;&amp;#x5C0F;&amp;#x7ED3;&lt;/h2&gt;&lt;p&gt;&amp;#x672C;&amp;#x6587;&amp;#x4ECE;&amp;#x4E09;&amp;#x4E2A;&amp;#x5206;&amp;#x652F;&amp;#x4E0A;&amp;#x6982;&amp;#x8FF0;&amp;#x4E86;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x7684;&amp;#x7B97;&amp;#x6CD5;&amp;#x3002;&amp;#x7279;&amp;#x5F81;&amp;#x8868;&amp;#x8FBE;&amp;#x65B9;&amp;#x9762;&amp;#xFF0C; &amp;#x57FA;&amp;#x4E8E;&amp;#x7EA7;&amp;#x8054;&amp;#x7ED3;&amp;#x6784;&amp;#x53CA;&amp;#x5F39;&amp;#x6027;&amp;#x4E0D;&amp;#x53D8;&amp;#x6A21;&amp;#x578B;&amp;#x7684;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x7B97;&amp;#x6CD5;&amp;#x591A;&amp;#x662F;&amp;#x4EBA;&amp;#x5DE5;&amp;#x8BBE;&amp;#x8BA1;&amp;#x7684;&amp;#xFF0C; &amp;#x800C;&amp;#x795E;&amp;#x7ECF;&amp;#x7F51;&amp;#x7EDC;/&amp;#x6DF1;&amp;#x5EA6;&amp;#x5B66;&amp;#x4E60;&amp;#x5219;&amp;#x662F;&amp;#x901A;&amp;#x8FC7;&amp;#x7F51;&amp;#x7EDC;&amp;#x5B66;&amp;#x4E60;&amp;#x4EBA;&amp;#x8138;&amp;#x7684;&amp;#x7279;&amp;#x5F81;&amp;#x56FE;&amp;#xFF0C; &amp;#x5177;&amp;#x6709;&amp;#x5206;&amp;#x5E03;&amp;#x5F0F;&amp;#x7279;&amp;#x5F81;&amp;#x8868;&amp;#x793A;&amp;#x65B9;&amp;#x5F0F;&amp;#x3002; &amp;#x5C3D;&amp;#x7BA1;&amp;#x5404;&amp;#x4E2A;&amp;#x5206;&amp;#x652F;&amp;#x7684;&amp;#x5904;&amp;#x7406;&amp;#x65B9;&amp;#x6CD5;&amp;#x4E0D;&amp;#x4E00;&amp;#xFF0C; &amp;#x4F46;&amp;#x53EF;&amp;#x4EE5;&amp;#x770B;&amp;#x5230;&amp;#x8FD9;&amp;#x4E09;&amp;#x7C7B;&amp;#x65B9;&amp;#x6CD5;&amp;#x7684;&amp;#x672C;&amp;#x8D28;&amp;#x90FD;&amp;#x662F;&amp;#x4E00;&amp;#x6837;&amp;#x7684;&amp;#xFF0C; &amp;#x90FD;&amp;#x662F;&amp;#x63D0;&amp;#x53D6;&amp;#x4EBA;&amp;#x8138;&amp;#x7279;&amp;#x5F81;&amp;#x8FDB;&amp;#x884C;&amp;#x5206;&amp;#x7C7B;&amp;#xFF0C; &amp;#x68C0;&amp;#x6D4B;&amp;#x51FA;&amp;#x56FE;&amp;#x50CF;&amp;#x4E2D;&amp;#x6240;&amp;#x6709;&amp;#x4EBA;&amp;#x8138;&amp;#x51FA;&amp;#x73B0;&amp;#x7684;&amp;#x4F4D;&amp;#x7F6E;&amp;#x3002; &amp;#x8FD9;&amp;#x4E09;&amp;#x8005;&amp;#x57FA;&amp;#x672C;&amp;#x7684;&amp;#x4E0D;&amp;#x540C;&amp;#x70B9;&amp;#x5728;&amp;#x4E8E;&amp;#xFF0C; &amp;#x57FA;&amp;#x4E8E;&amp;#x7EA7;&amp;#x8054;&amp;#x7ED3;&amp;#x6784;&amp;#x7684;&amp;#x7B97;&amp;#x6CD5;&amp;#x8003;&amp;#x8651;&amp;#x5230;&amp;#x4E86;&amp;#x56FE;&amp;#x50CF;&amp;#x4E2D;&amp;#x8D1F;&amp;#x6837;&amp;#x672C;&amp;#x6570;&amp;#x76EE;&amp;#x5E9E;&amp;#x5927;&amp;#x7684;&amp;#x56E0;&amp;#x7D20;&amp;#xFF0C; &amp;#x5728;&amp;#x68C0;&amp;#x6D4B;&amp;#x65F6;&amp;#x628A;&amp;#x8D1F;&amp;#x6837;&amp;#x672C;&amp;#x66F4;&amp;#x65E9;&amp;#x5730;&amp;#x53BB;&amp;#x9664;&amp;#x63D0;&amp;#x9AD8;&amp;#x4E86;&amp;#x6574;&amp;#x4F53;&amp;#x68C0;&amp;#x6D4B;&amp;#x7684;&amp;#x6548;&amp;#x7387;&amp;#x3002; &amp;#x57FA;&amp;#x4E8E;&amp;#x5F39;&amp;#x6027;&amp;#x4E0D;&amp;#x53D8;&amp;#x6A21;&amp;#x578B;&amp;#x7684;&amp;#x7B97;&amp;#x6CD5;&amp;#x9488;&amp;#x5BF9;&amp;#x4EBA;&amp;#x8138;&amp;#x5404;&amp;#x90E8;&amp;#x5206;&amp;#x5C40;&amp;#x90E8;&amp;#x7279;&amp;#x5F81;&amp;#x54CD;&amp;#x5E94;&amp;#x5BFB;&amp;#x627E;&amp;#x56FE;&amp;#x50CF;&amp;#x4E2D;&amp;#x7684;&amp;#x4EBA;&amp;#x8138;&amp;#x3002; &amp;#x57FA;&amp;#x4E8E;&amp;#x795E;&amp;#x7ECF;&amp;#x7F51;&amp;#x7EDC;/&amp;#x6DF1;&amp;#x5EA6;&amp;#x5B66;&amp;#x4E60;&amp;#x7684;&amp;#x7B97;&amp;#x6CD5;&amp;#x81EA;&amp;#x4E3B;&amp;#x5B66;&amp;#x4E60;&amp;#x4EBA;&amp;#x8138;&amp;#x5C40;&amp;#x90E8;&amp;#x53CA;&amp;#x6574;&amp;#x4F53;&amp;#x7279;&amp;#x5F81;&amp;#x3002;&lt;/p&gt;
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</content>

    <summary type="html">

      &lt;blockquote&gt;
&lt;p&gt;&amp;#x505A;&amp;#x4EBA;&amp;#x8138;&amp;#x68C0;&amp;#x6D4B;&amp;#x5DF2;&amp;#x7ECF;&amp;#x4E00;&amp;#x6BB5;&amp;#x65F6;&amp;#x95F4;&amp;#x4E86;&amp;#xFF0C;&amp;#x4E34;&amp;#x8FD1;&amp;#x6BD5;&amp;#x4E1A;&amp;#x60F3;&amp;#x60F3;&amp;#x5DE5;&amp;#x4F5C;&amp;#x540E;&amp;#x4F30;&amp;#x8BA1;&amp;#x5E94;&amp;#x8BE5;&amp;#x4E0D;&amp;#x4F1A;&amp;#x6709;&amp;#x592A;&amp;#x591A;&amp;#x65F6;&amp;#x95F4;&amp;#x518D;&amp;#x6765;&amp;#x641E;&amp;#x8FD9;&amp;#x4E2A;&amp;#xFF0C;&amp;#x4E0B;&amp;#x9762;&amp;#x62BD;&amp;#x53D6;&amp;#x4E86;&amp;#x6BD5;&amp;#x4E1A;&amp;#x8BBA;&amp;#x6587;&amp;#x7684;&amp;#x7B2C;&amp;#x4E8C;&amp;#x7AE0;&amp;#x5BF9;&amp;#x4EE5;&amp;#x524D;&amp;#x770B;&amp;#x8FC7;&amp;#x7684;&amp;#x8BBA;&amp;#x6587;&amp;#x8FDB;&amp;#x884C;&amp;#x4E86;&amp;#x603B;&amp;#x7ED3;&amp;#xFF0C;&amp;#x5199;&amp;#x6210;&amp;#x4E86;&amp;#x4E0B;&amp;#x9762;&amp;#x7684;&amp;#x7EFC;&amp;#x8FF0;&amp;#xFF0C;&amp;#x6DB5;&amp;#x76D6;&amp;#x5230;&amp;#x6BD4;&amp;#x8F83;&amp;#x591A;&amp;#x7684;&amp;#x65B9;&amp;#x6CD5;&amp;#xFF0C;&amp;#x5E0C;&amp;#x671B;&amp;#x5BF9;&amp;#x770B;&amp;#x5230;&amp;#x8FD9;&amp;#x7BC7;&amp;#x6587;&amp;#x7AE0;&amp;#x7684;&amp;#x7814;&amp;#x7A76;&amp;#x8005;&amp;#x4F1A;&amp;#x6709;&amp;#x6240;&amp;#x5E2E;&amp;#x52A9;&amp;#x3002;&lt;/p&gt;
&lt;/blockquote&gt;

    </summary>

      <category term="face detection" scheme="http://deyituo.github.io/categories/face-detection/"/>


      <category term="face detection" scheme="http://deyituo.github.io/tags/face-detection/"/>

      <category term="AI" scheme="http://deyituo.github.io/tags/AI/"/>

  </entry>

</feed>