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generics.html
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<h4>Nat!</h4>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/intro.html" title="De Re mulle-objc">De Re mulle-objc</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/modern-complex.html" title="Projects with Multiple Targets">Projects with Multiple Targets</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/basics.html" title="A complete class">A complete class</a>
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<h5> Or read it like a <a href="book.html"><b>book</b></a>.</h6>
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<h2>De Re mulle-objc <div style="font-size:10px; display: inline-block;">0.50.0</div> <a href="feed.xml"><img class="inline-img" src='images/feed-icon-28x28.png'></a></h2>
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<h6>© 2025 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
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<article>
<h1>Porting: generics</h1>
<div>
<h2 id="rewrite-by-removing-generics-typing">Rewrite by removing generics typing</h2>
<p>If your parameter is specified as <code class="language-plaintext highlighter-rouge">NSArray<NSNumber *></code> reduce the type
to <code class="language-plaintext highlighter-rouge">NSArray *</code>.</p>
<h2 id="validate-content-at-runtime">Validate content at runtime</h2>
<p>The way to validate array content in Objective-C is at runtime, when you
are inserting a value:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">NSParameterAssert</span><span class="p">(</span> <span class="p">[</span><span class="n">obj</span> <span class="nf">isKindOfClass</span><span class="p">:[</span><span class="n">NSNumber</span> <span class="nf">class</span><span class="p">]]);</span>
<span class="p">[</span><span class="n">array</span> <span class="nf">addObject</span><span class="p">:</span><span class="n">obj</span><span class="p">];</span>
</code></pre></div></div>
<h2 id="use-id-for-truely-generic-algorithms">Use <code class="language-plaintext highlighter-rouge">id</code> for truely generic algorithms</h2>
<p>If you want true generic algorithms, consider replacing your type with <code class="language-plaintext highlighter-rouge">id</code>.
You can also then specify the methods your algorithm requires using a
<code class="language-plaintext highlighter-rouge">@protocol</code> and then type your methods with <code class="language-plaintext highlighter-rouge">id <protocol></code>.
This keeps the algorithm the most resusable.</p>
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