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<!doctype html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
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<h4>Nat!</h4>
<p>Senior Mull</p>
</div>
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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>
<article>
<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>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/legacy.html" title="Porting: Legacy Workflow">Porting: Legacy Workflow</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/bad.html" title="Porting: Bad mulle-objc Code">Porting: Bad mulle-objc Code</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/porting.html" title="Porting: General Tips">Porting: General Tips</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/subscripting.html" title="Porting: subscripting">Porting: subscripting</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/arc.html" title="Porting: ARC">Porting: ARC</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/block.html" title="Porting: ^blocks">Porting: ^blocks</a>
</article>
<article>
<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>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/generics.html" title="Porting: generics">Porting: generics</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/modules.html" title="Porting: @import">Porting: @import</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/package.html" title="Porting: @package">Porting: @package</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/protocol.html" title="Porting: Protocols are a kind of @selector">Porting: Protocols are a kind of @selector</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/property.html" title="Porting @property">Porting @property</a>
</article>
<article>
<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>
</article>
<article>
<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>
</article>
<article>
<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>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/nszone.html" title="Porting: NSZone">Porting: NSZone</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/unichar.html" title="Porting: unichar">Porting: unichar</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/cpp.html" title="Porting: Objective-C++">Porting: Objective-C++</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/xcodeproj.html" title="Porting: Xcode projects">Porting: Xcode projects</a>
</article>
<article>
<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>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-mulle-objc/coverage.html" title="Tooling: Coverage information">Tooling: Coverage information</a>
</article>
<article>
<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 -->
</div> <!-- sideline -->
</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>Porting: Differences to Objective-C 2.0</h1>
<div>
<p>In terms of language features, <strong>mulle_objc</strong> resets the basis of Objective-C
back to ObjC 1.0 and cherrypicks improvements from the later versions.</p>
<h2 id="differences-to-objective-c-20">Differences to Objective-C 2.0</h2>
<p>Do not use the “not planned” features even if the <strong>mulle-objc</strong> compiler might
still understand them. The runtime or the linker will not support them.</p>
<table>
<thead>
<tr>
<th>Topic</th>
<th>State</th>
<th>Link</th>
<th> </th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>@encode()</strong></td>
<td>supported: 90% the same as the Apple runtime</td>
<td>([what is this ?](https://nshipster.com/</td>
<td>type-encodings/))</td>
</tr>
<tr>
<td><strong>@package</strong></td>
<td>never: will produce an error</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td><strong>@synchronized()</strong></td>
<td>not planned</td>
<td>(<a href="https://rykap.com/objective-c/2015/05/09/synchronized/">what is this ?</a>)</td>
<td> </td>
</tr>
<tr>
<td><strong>^</strong>blocks</td>
<td>not planned: [^3]</td>
<td>([what is this ?](https://medium.com/@amyjoscelyn/</td>
<td>blocks-and-closures-in-objective-c-2b763e9e0dc8))</td>
</tr>
<tr>
<td><strong>atomic</strong></td>
<td>not planned: <strong>atomic</strong> as default: never</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td><strong>BOOL</strong></td>
<td>supported: but it is an <code class="language-plaintext highlighter-rouge">int</code>. If you really need to use <code class="language-plaintext highlighter-rouge">bool</code> use <code class="language-plaintext highlighter-rouge">_Bool</code>.</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td><strong>@import</strong></td>
<td>not planned</td>
<td>([what is this ?](https://stoneofarc.wordpress.com/2013/06/25/</td>
<td>introduction-to-objective-c-modules/))</td>
</tr>
<tr>
<td><strong>nullable</strong></td>
<td>not planned: will produce an error [^2]</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td><strong>readonly</strong></td>
<td>supported: but an ivar will be synthesized</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td><strong>weak</strong>, <strong>strong</strong></td>
<td>never</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">__bridge</code></td>
<td>will be a nop #define (also <code class="language-plaintext highlighter-rouge">__bridge_retained</code>, <code class="language-plaintext highlighter-rouge">__bridge_transfer</code>)</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">__unsafe_unretained</code></td>
<td>could be a nop #define (<code class="language-plaintext highlighter-rouge">_autoreleasing</code>)</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>ARC</td>
<td>never: but look for mulle-objc’s AAM</td>
<td>([what is this ?](https://www.yorkhua.com/</td>
<td>objective-c-arc/))</td>
</tr>
<tr>
<td><strong>@implementation()</strong></td>
<td>never: class extension with added instance variables don’t work</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td><strong>NSArray<NSString* ></strong></td>
<td>never: generics are not in the cards</td>
<td>([what is this ?](https://www.thomashanning.com/</td>
<td>objective-c-lightweight-generics/)</td>
</tr>
<tr>
<td>ObjectiveC++</td>
<td>never: But the mulle-objc instance memory layout should be <code class="language-plaintext highlighter-rouge">this->__vtab</code> compatible to</td>
<td>allow dual facing objects.</td>
<td> </td>
</tr>
<tr>
<td>NSArray *foo; foo[ 1]</td>
<td>not planned: [^1] what is known as “Subscripting”</td>
<td>([what is this ?](https://nshipster.com/</td>
<td>object-subscripting/))</td>
</tr>
<tr>
<td>Non-fragile ivars</td>
<td>never</td>
<td>([what is this ?](https://www.sealiesoftware.com/blog/archive/2009/01/27/</td>
<td>objc_explain_Non-fragile_ivars.html))</td>
</tr>
<tr>
<td>property dot syntax</td>
<td>not planned: [^1]</td>
<td>([what is this ?](https://stackoverflow.com/questions/7423853/</td>
<td>whats-the-difference-between-dot-syntax-and-square-bracket-syntax))</td>
</tr>
<tr>
<td>Protocol</td>
<td>never: <code class="language-plaintext highlighter-rouge">Protocol</code> as a class is gone. You have to use <code class="language-plaintext highlighter-rouge">PROTOCOL</code> instead of <code class="language-plaintext highlighter-rouge">Protocol *</code></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>variadic arguments (:…)</td>
<td>supported: but not compatible to <code class="language-plaintext highlighter-rouge"><stdarg.h></code></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
<table>
<thead>
<tr>
<th>Topic</th>
<th>State</th>
<th>Link</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="language-plaintext highlighter-rouge">NSLog</code></td>
<td>generally not used anymore, use <code class="language-plaintext highlighter-rouge">mulle-printf</code> instead</td>
<td> </td>
</tr>
</tbody>
</table>
<hr />
<h3 id="appendix">Appendix</h3>
<h4 id="footnotes">Footnotes</h4>
<p>[^1] : This is basically operator overloading, which is un-C like.</p>
<p>[^2] : Superflous keyword, ObjC is by design nullable. It only makes sense to
adorn non-nullable parameters.</p>
<p>[^3] : GCD is a Apple technology, that really needs kernel support to work well. lambdas are not a part of C11. Generally I find blocks unconvincing. It might be an idea to make <code class="language-plaintext highlighter-rouge">NSInvocation</code>s out of block syntax ?</p>
<h4 id="glossary">Glossary</h4>
<table>
<thead>
<tr>
<th>Wording</th>
<th>Meaning</th>
</tr>
</thead>
<tbody>
<tr>
<td>not supported</td>
<td>might just accidentally work</td>
</tr>
<tr>
<td>not planned</td>
<td>never say never, but this probably won’t happen</td>
</tr>
<tr>
<td>never</td>
<td>sometimes you have to say never :)</td>
</tr>
</tbody>
</table>
<h4 id="terminology">Terminology</h4>
<p>For the discussed concepts and terminology check any of the following links.</p>
<ol>
<li><a href="https://en.wikipedia.org/wiki/Objective-C#Objective-C_2.0">Wikipedia: Objective-C</a></li>
<li><a href="https://developer.apple.com/library/prerelease/ios/releasenotes/ObjectiveC/ObjCAvailabilityIndex/index.html">Apple: Objective-C Feature Availability Index</a></li>
<li><a href="http://nshipster.com/at-compiler-directives">NSHipster: @compiler directives</a></li>
</ol>
</div>
</article>
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