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Updated to Chapter 8, Section 4
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‎Structure.md

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#### 常量成员
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#### `const`限定的成员函数
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包括常成员函数
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#### `mutable`
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‎generalized_parts/08_a_step_forward_in_classes_and_functions/04_property_of_member.tex

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‎images/generalized_parts/08_file_inclusion_300.png

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‎images/generalized_parts/08_lazy_tag_300.png

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‎images/generalized_parts/drawio/.$08_file_inclusion.drawio.bkp

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<mxCell id="Jd0V6s8Q-409282UJGnS-30" value="&lt;font face=&quot;consolas&quot;&gt;全程没有调用length()&lt;br&gt;所以不需要计算&lt;br&gt;节省时间&lt;br&gt;&lt;/font&gt;" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;" vertex="1" parent="1">
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<mxCell id="Jd0V6s8Q-409282UJGnS-31" value="&lt;font face=&quot;consolas&quot;&gt;首次调用length()时计算&lt;br&gt;并清除延迟标记&lt;br&gt;以后调用时直接返回值&lt;br&gt;无需再算&lt;br&gt;&lt;/font&gt;" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;" vertex="1" parent="1">
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