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intro.html
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<!doctype html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
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<meta http-equiv="Content-Security-Policy" content="default-src *; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' 'unsafe-eval'">
<title>Intro – Objective-C Runtime in Pictures</title>
<meta name="description" content="
">
<meta name="keywords" content="">
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<meta name="twitter:title" content="Intro">
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<meta name="twitter:site" content="@mulle_nat">
<meta name="twitter:creator" content="@mulle_nat">
<meta name="twitter:card" content="summary">
<meta name="twitter:image" content="/objc-runtime-in-pictures/images/default-thumb.png">
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<meta property="og:locale" content="en_US">
<meta property="og:type" content="article">
<meta property="og:title" content="Intro">
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<meta property="og:url" content="https://www.mulle-kybernetik.com/intro.html">
<meta property="og:site_name" content="Objective-C Runtime in Pictures">
<link href="/objc-runtime-in-pictures/atom.xml" type="application/atom+xml" rel="alternate" title="Objective-C Runtime in Pictures Feed">
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<div class="sideline">
<div class="bio">
<div class="bio-photo-container" style="display: inline-block">
<img src="/objc-runtime-in-pictures/images/dog-pic.jpg" class="bio-photo" alt="Nat! bio photo">
</div>
<div style="display: inline-block; padding-left: 8px">
<h4>Nat!</h4>
<p>Senior Mull</p>
</div>
<div class="author-social"><a href="//www.mulle-kybernetik.com" target="_blank" class="link"><img class="inline-img" src="/objc-runtime-in-pictures/images/homepage-svgrepo-com.svg"></a> <a href="//www.mulle-kybernetik.com" target="_blank" class="link">WWW</a></div>
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</div> <!-- bio -->
<div class="title">
<div>
<h2>Objective-C Runtime in Pictures <a href="/objc-runtime-in-pictures/feed.xml"><img class="inline-img" src="/objc-runtime-in-pictures/images/feed-icon-28x28.png"></a></h2>
</div>
<h6>© 2024 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
<p>
</div> <!-- title -->
<div class="contents">
<h4>Contents</h4>
<ul>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/intro.html" title="Intro">Intro</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/class.html" title="Class">Class</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/ivar.html" title="Ivar">Ivar</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/method.html" title="Method">Method</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/property.html" title="Property">Property</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/category.html" title="Category">Category</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/protocol.html" title="Protocol">Protocol</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/inheritance.html" title="Inheritance">Inheritance</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/protocolclass.html" title="Protocolclass">Protocolclass</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/quiz.html" title="Quiz">Quiz</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/outro.html" title="Outro">Outro</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/appendix.html" title="Appendix">Appendix</a>
</article>
</ul>
</div> <!-- contents -->
</div> <!-- sideline -->
</div>
<div id="post-second" class="eight columns">
<div class="title">
<div>
<h2>Objective-C Runtime in Pictures <a href="/objc-runtime-in-pictures/feed.xml"><img class="inline-img" src="/objc-runtime-in-pictures/images/feed-icon-28x28.png"></a></h2>
</div>
<h6>© 2024 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
<p>
</div> <!-- title -->
<p>
<div id="main" role="main">
<article>
<h1>Intro</h1>
<div>
<p><img src="images/image-2.jpg" alt="Gratuitous AI generated banner" class="banner-image" /></p>
<h1 id="the-objective-c-runtime-in-pictures">The Objective-C runtime in pictures</h1>
<p>Objective-C, born in the early 1980s, merged Smalltalk’s object-oriented
paradigm with C’s efficiency. It powered NeXTSTEP and later became the
foundation of Apple’s macOS and iOS development.</p>
<p><a href="https://mulle-objc.github.io">mulle-objc</a> is a clean-room implementation of
the Objective-C runtime that eliminates the dependency on Apple’s runtime,
but deviates in a few important aspects…</p>
<p>The actual runtime is written in C and contained in
<a href="https://github.com/mulle-objc/mulle-objc-runtime">mulle-objc-runtime</a>. The
API though is <a href="https://github.com/mulle-objc/MulleObjC">MulleObjC</a> which
also contains a few basic building block classes.</p>
<p>This little pamphlet explores the relationship between, what you type in
your editor as Objective-C syntax, and what ends up in your running
mulle-objc application, after passing the compilation and linking stage.</p>
<p>Read how</p>
<ul>
<li><a href="class.html">classes</a> with class <a href="inheritance.html">inheritance</a></li>
<li><a href="category.html">categories</a></li>
<li><a href="protocol.html">protocols</a></li>
<li><a href="protocolclass.html">protocolclasses</a></li>
<li><a href="ivar.html">ivars</a></li>
<li><a href="method.html">methods</a> and method <a href="appendix.html">calls</a></li>
<li><a href="property.html">properties</a></li>
</ul>
<p>are represented at runtime. Once you got it, you can
take a small</p>
<ul>
<li><a href="quiz.html">quiz</a></li>
</ul>
<p>to test your knowledge. If you like the pictures, you can easily
create them yourself as explained in the</p>
<ul>
<li><a href="outro.html">outro</a></li>
</ul>
</div>
</article>
</div>
<p>
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</div>
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<span class="link">
Next <a rel="next" class="internal-link" href="/objc-runtime-in-pictures/class.html">Class</a>
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</body>
</html>