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<h5> Or read it like a <a href="book.html"><b>book</b></a>.</h6>
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<div id="post-second" class="eight columns">
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<div>
<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>
</div>
<h6>© 2025 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
<p>
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<article>
<h1>Porting: Objective-C++</h1>
<div>
<div class="alert alert-info" role="alert"><i class="fa fa-info-circle"></i> <b>Note:</b> C++ is already the most complex language in the
world and adding Objective-C on top of it, is like the worst of both worlds.</div>
<h2 id="use-c-from-objective-c">Use C++ from Objective-C</h2>
<p>Create a C code wrapper to call the C++ functions. Then call the C code from
Objective-C.</p>
<p>C++</p>
<p><code class="language-plaintext highlighter-rouge">cpp.h:</code></p>
<div class="language-c++ highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#ifdef __cplusplus
</span><span class="k">extern</span> <span class="s">"C"</span>
<span class="p">{</span>
<span class="cp">#endif
</span> <span class="kt">void</span> <span class="n">call_cpp1</span><span class="p">(</span> <span class="kt">char</span> <span class="o">*</span><span class="p">);</span>
<span class="kt">char</span> <span class="o">*</span><span class="n">call_cpp2</span><span class="p">(</span> <span class="kt">void</span><span class="p">);</span>
<span class="cp">#ifdef __cplusplus
</span><span class="p">};</span>
<span class="cp">#endif
</span></code></pre></div></div>
<p>Objective-C</p>
<p><code class="language-plaintext highlighter-rouge">foo.m</code></p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#include</span> <span class="cpf"><cpp.h></span><span class="cp">
</span>
<span class="k">@implementation</span> <span class="nc">Foo</span>
<span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="nf">callCPlusPlus1</span><span class="p">:(</span><span class="kt">char</span> <span class="o">*</span><span class="p">)</span> <span class="n">s</span>
<span class="p">{</span>
<span class="n">call_cpp1</span><span class="p">(</span> <span class="n">s</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">-</span> <span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="p">)</span> <span class="n">callCPlusPlus2</span>
<span class="p">{</span>
<span class="k">return</span><span class="p">(</span> <span class="n">call_cpp2</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">@end</span>
</code></pre></div></div>
<h2 id="use-objective-c-from-c">Use Objective-C from C++</h2>
<p>This is possible too, but you need to link against the <code class="language-plaintext highlighter-rouge">mulle-objc-runtime.h</code>
only:</p>
<blockquote>
<p>TODO: test this does this work with mulle-c11 ?</p>
</blockquote>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#ifdef __cplusplus
</span><span class="k">extern</span> <span class="s">"C"</span>
<span class="p">{</span>
<span class="cp">#include</span> <span class="cpf"><mulle-objc/mulle-objc-runtime.h></span><span class="cp">
</span><span class="p">};</span>
<span class="cp">#endif
</span></code></pre></div></div>
<p>Now you can use the runtime functions to create instances and call them.
It’s very cumbersome though.</p>
</div>
</article>
</div>
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