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<h4>Nat!</h4>
<p>Senior Mull</p>
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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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<h4>Contents</h4>
<ul>
<article>
<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>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/modern.html" title="Project Setup">Project Setup</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/pnp-source.html" title="Generic Headers">Generic Headers</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/pnp-dependency.html" title="Dependencies">Dependencies</a>
</article>
<article>
<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>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/good.html" title="Good mulle-objc Code">Good mulle-objc Code</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/basics.html" title="A complete class">A complete class</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/objects.html" title="Objects and Properties">Objects and Properties</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/printing.html" title="Printing">Printing</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/pnp-class.html" title="Plug And Play Class">Plug And Play Class</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/pnp-category.html" title="Plug And Play Category">Plug And Play Category</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/overridden.html" title="Advanced: Calling overridden methods">Advanced: Calling overridden methods</a>
</article>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/forward.html" title="Advanced: -forward:">Advanced: -forward:</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/protocolclass.html" title="Advanced: Protocolclasses allow default implementations">Advanced: Protocolclasses allow default implementations</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/classcluster.html" title="Advanced: Classcluster Classes">Advanced: Classcluster Classes</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/singleton.html" title="Advanced: Singleton classes">Advanced: Singleton classes</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/tps.html" title="Advanced: Tagged Pointer Classes">Advanced: Tagged Pointer Classes</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/differences.html" title="Porting: Differences to Objective-C 2.0">Porting: Differences to Objective-C 2.0</a>
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<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/legacy.html" title="Porting: Legacy Workflow">Porting: Legacy Workflow</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/porting.html" title="Porting: General Tips">Porting: General Tips</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/subscripting.html" title="Porting: subscripting">Porting: subscripting</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/arc.html" title="Porting: ARC">Porting: ARC</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/block.html" title="Porting: ^blocks">Porting: ^blocks</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/dotsyntax.html" title="Porting: . syntax for properties">Porting: . syntax for properties</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/generics.html" title="Porting: generics">Porting: generics</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/property.html" title="Porting @property">Porting @property</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/synthesize.html" title="Porting: @synthesize is useless now">Porting: @synthesize is useless now</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/synchronized.html" title="Porting: Synchronized is gone">Porting: Synchronized is gone</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/varargs.html" title="Porting: Variable Arguments in Methods">Porting: Variable Arguments in Methods</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/nszone.html" title="Porting: NSZone">Porting: NSZone</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/cpp.html" title="Porting: Objective-C++">Porting: Objective-C++</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/tools.html" title="Tooling: mulle-objc Tools">Tooling: mulle-objc Tools</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/coverage.html" title="Tooling: Coverage information">Tooling: Coverage information</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/reduction.html" title="Tooling: Code reduction">Tooling: Code reduction</a>
</article>
</ul>
<h5> Or read it like a <a href="book.html"><b>book</b></a>.</h6>
</div> <!-- contents -->
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</div>
<div id="post-second" class="eight columns">
<div class="title">
<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>
</div> <!-- title -->
<p>
<div id="main" role="main">
<article>
<h1>Generic Headers</h1>
<div>
<p>Ideally source files should be motile. One would like to easily move them
between various projects without having to edit anything. The modern workflow
achieves this with generic header names.</p>
<p>As we saw in the
previous chapter, headers and libraries are transparently added and removed
to a project with mulle-sde. All the <strong>external</strong> dependencies are isolated
in header files with generic names. Headers belonging to the project do not
appear in these files.</p>
<table>
<thead>
<tr>
<th>Header</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="language-plaintext highlighter-rouge">include.h</code></td>
<td>Used by C header files</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">include-private.h</code></td>
<td>Used by C source files</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">import.h</code></td>
<td>Used by Objective-C interface files</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">import-private.h</code></td>
<td>Used by Objective-C implementation files</td>
</tr>
</tbody>
</table>
<p>So we can write our source code in a uniform way.</p>
<h2 id="objective-c">Objective-C</h2>
<p><code class="language-plaintext highlighter-rouge">Foo.h</code>:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#import "import.h"
</span>
<span class="k">@interface</span> <span class="nc">Foo</span> <span class="p">:</span> <span class="nc">NSObject</span>
<span class="k">@end</span>
</code></pre></div></div>
<p>and the implementation like so:</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">#import "Foo.h"
</span>
<span class="cp">#import "import-private.h"
</span>
<span class="k">@implementation</span> <span class="nc">Foo</span>
<span class="k">@end</span>
</code></pre></div></div>
<h2 id="c">C</h2>
<p>For C its quite the same, but different header files are used.</p>
<p><code class="language-plaintext highlighter-rouge">foo.h</code>:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#include</span> <span class="cpf">"include.h"</span><span class="cp">
</span>
<span class="kt">void</span> <span class="nf">foo</span><span class="p">(</span> <span class="kt">void</span><span class="p">);</span>
</code></pre></div></div>
<p><code class="language-plaintext highlighter-rouge">foo.c</code>:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#include</span> <span class="cpf">"foo.h"</span><span class="cp">
</span>
<span class="cp">#include</span> <span class="cpf">"include-private.h"</span><span class="cp">
</span>
<span class="kt">void</span> <span class="nf">foo</span><span class="p">(</span> <span class="kt">void</span><span class="p">)</span>
<span class="p">{</span>
<span class="n">calling</span><span class="p">(</span> <span class="s">"whatever"</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div></div>
<h2 id="conclusion">Conclusion</h2>
<p>As platform dependent headers and <code class="language-plaintext highlighter-rouge">#ifdef</code> definitions are isolated in
the generic headers, this is basically all there is to it. Read <a href="https://www.mulle-kybernetik.com/weblog/2019/beauty_of_generic_headers.html">The beauty of generic header-names</a>
for more details on this topic.</p>
<blockquote>
<p>Memo: What doesn’t work yet, is full independence from other headers in the
same library.</p>
</blockquote>
</div>
</article>
</div>
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