97 lines
4.7 KiB
HTML
97 lines
4.7 KiB
HTML
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<!DOCTYPE html>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>The Metaobject Protocol (Guile Reference Manual)</title>
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<meta name="description" content="The Metaobject Protocol (Guile Reference Manual)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="GOOPS.html" rel="up" title="GOOPS">
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<link href="Redefining-a-Class.html" rel="next" title="Redefining a Class">
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<link href="GOOPS-Object-Miscellany.html" rel="prev" title="GOOPS Object Miscellany">
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</head>
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<body lang="en">
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<div class="section-level-extent" id="The-Metaobject-Protocol">
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<div class="nav-panel">
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<p>
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Next: <a href="Redefining-a-Class.html" accesskey="n" rel="next">Redefining a Class</a>, Previous: <a href="GOOPS-Object-Miscellany.html" accesskey="p" rel="prev">GOOPS Object Miscellany</a>, Up: <a href="GOOPS.html" accesskey="u" rel="up">GOOPS</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h3 class="section" id="The-Metaobject-Protocol-1"><span>8.11 The Metaobject Protocol<a class="copiable-link" href="#The-Metaobject-Protocol-1"> ¶</a></span></h3>
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<p>At this point, we’ve said about as much as can be said about GOOPS
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without having to confront the idea of the metaobject protocol. There
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are a couple more topics that could be discussed in isolation first —
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class redefinition, and changing the class of existing instances — but
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in practice developers using them will be advanced enough to want to
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understand the metaobject protocol too, and will probably be using the
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protocol to customize exactly what happens during these events.
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</p>
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<p>So let’s plunge in. GOOPS is based on a “metaobject protocol” (aka
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“MOP”) derived from the ones used in CLOS (the Common Lisp Object
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System), tiny-clos (a small Scheme implementation of a subset of CLOS
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functionality) and STKlos.
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</p>
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<p>The MOP underlies many possible GOOPS customizations — such as
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defining an <code class="code">initialize</code> method to customize the initialization of
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instances of an application-defined class — and an understanding of
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the MOP makes it much easier to explain such customizations in a precise
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way. And at a deeper level, understanding the MOP is a key part of
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understanding GOOPS, and of taking full advantage of GOOPS’ power, by
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customizing the behavior of GOOPS itself.
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</p>
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<ul class="mini-toc">
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<li><a href="Metaobjects-and-the-Metaobject-Protocol.html" accesskey="1">Metaobjects and the Metaobject Protocol</a></li>
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<li><a href="Metaclasses.html" accesskey="2">Metaclasses</a></li>
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<li><a href="MOP-Specification.html" accesskey="3">MOP Specification</a></li>
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<li><a href="Instance-Creation-Protocol.html" accesskey="4">Instance Creation Protocol</a></li>
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<li><a href="Class-Definition-Protocol.html" accesskey="5">Class Definition Protocol</a></li>
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<li><a href="Customizing-Class-Definition.html" accesskey="6">Customizing Class Definition</a></li>
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<li><a href="Method-Definition.html" accesskey="7">Method Definition</a></li>
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<li><a href="Method-Definition-Internals.html" accesskey="8">Method Definition Internals</a></li>
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<li><a href="Generic-Function-Internals.html" accesskey="9">Generic Function Internals</a></li>
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<li><a href="Generic-Function-Invocation.html">Generic Function Invocation</a></li>
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</ul>
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</div>
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</body>
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</html>
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