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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<link rel="canonical" href="https://clos-mop.hexstreamsoft.com/classes/" />
<link rel="license" href="https://clos-mop.hexstreamsoft.com/UNLICENSE" />
<meta name="description" content="Fancy version of Robert Strandh's work describing all the classes mentioned in the CLOS MOP specification." />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Classes (Non-normative) | CLOS MOP specification</title>
<link rel="stylesheet" type="text/css" href="https://global.hexstream.dev/css/global.css" />
<link rel="stylesheet" type="text/css" href="https://global.hexstream.dev/css/notice.css" />
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<link rel="preload" as="font" type="font/woff2" href="https://global.hexstream.dev/fonts/kaushan-script/KaushanScript-Regular.woff2" crossorigin />
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<link rel="modulepreload" href="https://global.hexstream.dev/scripts/definition-tree.mjs" />
<link rel="modulepreload" href="https://global.hexstream.dev/scripts/key-to-values.mjs" />
</head>
<body>
<nav id="top-nav">
<div class="main">
<div class="breadcrumbs">
<a href="https://www.hexstreamsoft.com/">HexstreamSoft</a>
<span class="crumb"><span class="s"> » </span><a href="https://www.hexstreamsoft.com/articles/">Articles</a></span>
<span class="crumb"><span class="s"> » </span><a href="../">CLOS MOP</a></span>
<span class="crumb"><span class="s"> » </span><a class="here">Classes</a></span>
</div>
<nav class="tabs">
<ul>
<li><a href="../concepts/">Concepts</a></li>
<li><a href="../generic-functions-and-methods/">Generic Functions and Methods</a></li>
<li><a class="here">Classes</a></li>
</ul>
</nav>
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<ul>
<li><a href="../preferences/">Preferences</a></li>
</ul>
</nav>
</div>
<p id="last-updated"><span>This page was last updated on </span><time datetime="2018-10-30">30 october 2018</time><span>.</span></p>
</nav>
<main>
<header id="page-header">
<h1>Classes</h1>
<p class="description">This section, <strong>not</strong> part of the CLOS MOP specification,<br />is a direct adaptation of Robert Strandh's work.</p>
</header>
<nav class="hanging-menu">
<ul>
<li class="rs-version"><a href="http://metamodular.com/CLOS-MOP/list-of-classes.html" target="_blank">RS</a></li>
</ul>
</nav>
<section id="class-graph-section">
<h1 class="breadcrumbs-bar">
<span class="section-relative-nav">
<a href="#class-graph-section" class="anchor">⚓</a>
</span>
<span class="breadcrumbs">
<a class="here">Class graph</a>
</span>
</h1>
<nav class="hanging-menu">
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<li class="rs-version"><a href="http://metamodular.com/CLOS-MOP/graph.png" target="_blank">RS</a></li>
</ul>
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<p id="cg_credits">HTML/CSS/SVG remake by Jean-Philippe Paradis,<br />derived from Robert Strandh's original.</p>
<div class="row">
<div class="item">
<a href="#t" id="cg_t" class="standard middle"><span>T</span></a>
</div>
</div>
<div class="row">
<div class="item">
<a href="#function" id="cg_function" class="standard middle-left"><span>function</span></a>
</div>
<div class="item">
<a href="#standard-object" id="cg_standard-object" class="standard middle"><span>standard-object</span></a>
</div>
</div>
<div class="row">
<div class="item">
<a href="#funcallable-standard-object" id="cg_funcallable-standard-object" class="left"><span>funcallable-standard-object</span></a>
</div>
<div class="item">
<a href="#metaobject" id="cg_metaobject" class="abstract middle"><span>metaobject</span></a>
</div>
</div>
<div class="row">
<div class="item">
<a href="#generic-function" id="cg_generic-function" class="standard left"><span>generic-function</span></a>
</div>
<div class="item">
<a href="#method" id="cg_method" class="standard abstract middle-left"><span>method</span></a>
</div>
<div class="item">
<a href="#slot-definition" id="cg_slot-definition" class="abstract"><span>slot-definition</span></a>
</div>
<div class="item">
<a href="#method-combination" id="cg_method-combination" class="abstract"><span>method-combination</span></a>
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<div class="item">
<a href="#specializer" id="cg_specializer" class="abstract"><span>specializer</span></a>
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<a href="#standard-generic-function" id="cg_standard-generic-function" class="standard left"><span>standard-generic-function</span></a>
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<a href="#standard-method" id="cg_standard-method" class="standard middle-left"><span>standard-method</span></a>
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<a href="#direct-slot-definition" id="cg_direct-slot-definition" class="abstract"><span>direct-slot-definition</span></a>
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<a href="#standard-slot-definition" id="cg_standard-slot-definition" class="abstract"><span>standard-slot-definition</span></a>
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<div class="item">
<a href="#effective-slot-definition" id="cg_effective-slot-definition" class="abstract"><span>effective-slot-definition</span></a>
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<div class="item">
<a href="#class" id="cg_class" class="standard abstract"><span>class</span></a>
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<a href="#eql-specializer" id="cg_eql-specializer"><span>eql-specializer</span></a>
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<a href="#standard-direct-slot-definition" id="cg_standard-direct-slot-definition"><span>standard-direct-slot-definition</span></a>
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<a href="#standard-writer-method" id="cg_standard-writer-method"><span>standard-writer-method</span></a>
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<a href="#standard-class" id="cg_standard-class" class="standard"><span>standard-class</span></a>
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<a href="#funcallable-standard-class" id="cg_funcallable-standard-class"><span>funcallable-standard-class</span></a>
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<a href="#built-in-class" id="cg_built-in-class" class="standard"><span>built-in-class</span></a>
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<div class="item">
<a href="#forward-referenced-class" id="cg_forward-referenced-class"><span>forward-referenced-class</span></a>
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</div>
</div>
</div>
</section>
<section id="t">
<h1 class="breadcrumbs-bar">
<span class="section-relative-nav">
<a href="#t" class="anchor">⚓</a>
</span>
<span class="breadcrumbs">
<a class="here">T</a>
</span>
</h1>
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<article class="class definition">
<h1><span class="type">Class</span> <span class="name self">T</span></h1>
<p class="direct-superclasses">No superclasses.</p>
<p class="metaclass"><b>Metaclass:</b> <a href="#built-in-class" class="body-link class">built-in-class</a></p>
<section class="description">
<h1>Description</h1>
<p>The root of the class graph.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>See also the <a href="https://www.lispworks.com/documentation/HyperSpec/Body/t_t.htm" class="body-link clhs" target="_blank">entry in the Common Lisp HyperSpec</a> for this class.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<div class="notice note">
<b>ℹ</b>
<div>
<p>Note that all "Mentions" sections on this page never take into account any mentions in <a href="../concepts/#table-5.1_figure">Table 5.1</a>, since that table mentions all CLOS MOP related classes.</p>
</div>
</div>
<article>
<h1><a href="../concepts/#instance-structure-protocol">5.5.3 Instance Structure Protocol</a></h1>
<blockquote>
<p>In particular, portable programs can control the implementation of, and obtain direct access to, slots with allocation <code>:instance</code> and type <a href="#t" class="body-link class t mention">T</a>. These are called <i>directly accessible slots</i>.</p>
</blockquote>
</article>
</section>
</article>
</section>
<section id="function">
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<article class="class definition">
<h1><span class="type">Class</span> <span class="name self">function</span></h1>
<p class="direct-superclasses"><a href="#t" class="body-link class">T</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#built-in-class" class="body-link class">built-in-class</a></p>
<section class="description">
<h1>Description</h1>
<p>This class represents objects that can be executed.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>See also the <a href="https://www.lispworks.com/documentation/HyperSpec/Body/t_fn.htm" class="body-link clhs" target="_blank">entry in the Common Lisp HyperSpec</a> for this class.</p>
</section>
<section class="mentions none">
<h1>Mentions</h1>
<p>None in chapter 5, aside from <a href="../concepts/#table-5.1_figure">Table 5.1</a>.</p>
</section>
</article>
</section>
<section id="standard-object">
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<h1><span class="type">Class</span> <span class="name self">standard-object</span></h1>
<p class="direct-superclasses"><a href="#t" class="body-link class">T</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>This class is the default direct superclass of the class <a href="#standard-class" class="body-link class">standard-class</a>. When an instance of the class <a href="#standard-class" class="body-link class">standard-class</a> is created, and no direct superclasses are explicitly specified, it defaults to this class. In this way, any behavior associated with this class will be inherited, directly or indirectly, by all instances of the class <a href="#standard-class" class="body-link class">standard-class</a>. A subclass of <a href="#standard-class" class="body-link class">standard-class</a> may have a different class as its default direct superclass, but that class must be a subclass of this class.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>See also the <a href="https://www.lispworks.com/documentation/HyperSpec/Body/t_std_ob.htm#standard-object" class="body-link clhs" target="_blank">entry in the Common Lisp HyperSpec</a> for this class.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<article>
<h1><a href="../concepts/#inheritance-structure-of-metaobject-classes">5.3 Inheritance structure of metaobject classes</a></h1>
<blockquote>
<p>The class <a href="#standard-object" class="body-link class mention">standard-object</a> is the <i>default direct superclass</i> of the class <a href="#standard-class" class="body-link class">standard-class</a>. When an instance of the class <a href="#standard-class" class="body-link class">standard-class</a> is created, and no direct superclasses are explicitly specified, it defaults to the class <a href="#standard-object" class="body-link class mention">standard-object</a>. In this way, any behavior associated with the class <a href="#standard-object" class="body-link class mention">standard-object</a> will be inherited, directly or indirectly, by all instances of the class <a href="#standard-class" class="body-link class">standard-class</a>. A subclass of <a href="#standard-class" class="body-link class">standard-class</a> may have a different class as its default direct superclass, but that class must be a subclass of the class <a href="#standard-object" class="body-link class mention">standard-object</a>.</p>
</blockquote>
</article>
</section>
</article>
</section>
<section id="funcallable-standard-object">
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<h1><span class="type">Class</span> <span class="name self">funcallable-standard-object</span></h1>
<p class="direct-superclasses"><a href="#function" class="body-link class">function</a> <a href="#standard-object" class="body-link class">standard-object</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>This class is the default direct superclass of the class <a href="#funcallable-standard-class" class="body-link class">funcallable-standard-class</a>. When an instance of the class <a href="#funcallable-standard-class" class="body-link class">funcallable-standard-class</a> is created, and no direct superclasses are explicitly specified, it defaults to this class. In this way, any behavior associated with this class will be inherited, directly or indirectly, by all instances of the class <a href="#funcallable-standard-class" class="body-link class">funcallable-standard-class</a>. A subclass of <a href="#funcallable-standard-class" class="body-link class">funcallable-standard-class</a> may have a different class as its default direct superclass, but that class must be a subclass of this class.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<article>
<h1><a href="../concepts/#inheritance-structure-of-metaobject-classes">5.3 Inheritance structure of metaobject classes</a></h1>
<blockquote>
<p>The same is true for <a href="#funcallable-standard-class" class="body-link class">funcallable-standard-class</a> and <a href="#funcallable-standard-object" class="body-link class mention">funcallable-standard-object</a>.</p>
</blockquote>
</article>
</section>
</article>
</section>
<section id="metaobject">
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<article class="class definition">
<h1><span class="type">Class</span> <span class="name self">metaobject</span></h1>
<p class="direct-superclasses"><a href="#standard-object" class="body-link class">standard-object</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>The superclass of all metaobject classes.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>This class is an <em>abstract class</em> and is not intended to be instantiated. The results are undefined if an attempt is made to make an instance of this class with <a href="../generic-functions-and-methods/#make-instance" class="body-link generic-function">make-instance</a>.</p>
</section>
<section class="mentions none">
<h1>Mentions</h1>
<p>None in chapter 5, aside from <a href="../concepts/#table-5.1_figure">Table 5.1</a>.</p>
</section>
</article>
</section>
<section id="generic-function">
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<article class="class definition">
<h1><span class="type">Class</span> <span class="name self">generic-function</span></h1>
<p class="direct-superclasses"><a href="#funcallable-standard-object" class="body-link class">funcallable-standard-object</a> <a href="#metaobject" class="body-link class">metaobject</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#funcallable-standard-class" class="body-link class">funcallable-standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>The root class of all generic functions.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>See also the <a href="https://www.lispworks.com/documentation/HyperSpec/Body/t_generi.htm#generic-function" class="body-link clhs" target="_blank">entry in the Common Lisp HyperSpec</a> for this class.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<article>
<h1><a href="../concepts/#metaobjects">5.2 Metaobjects</a></h1>
<blockquote>
<p>For each kind of program element there is a corresponding <i>basic metaobject class</i>. These are the classes: <a href="#class" class="body-link class">class</a>, <a href="#slot-definition" class="body-link class">slot-definition</a>, <a href="#generic-function" class="body-link class mention">generic-function</a>, <a href="#method" class="body-link class">method</a>, and <a href="#method-combination" class="body-link class">method-combination</a>. <span class="ellipsis">[...]</span></p>
</blockquote>
</article>
</section>
</article>
</section>
<section id="standard-generic-function">
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<h1><span class="type">Class</span> <span class="name self">standard-generic-function</span></h1>
<p class="direct-superclasses"><a href="#generic-function" class="body-link class">generic-function</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#funcallable-standard-class" class="body-link class">funcallable-standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>This class is a <em>standard metaobject class</em>. This is the class that the macro <a href="https://www.lispworks.com/documentation/HyperSpec/Body/m_defgen.htm#defgeneric" class="body-link clhs" target="_blank">defgeneric</a> uses by default. This is also a class on which user specializations are normally based.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>See also the <a href="https://www.lispworks.com/documentation/HyperSpec/Body/t_std_ge.htm#standard-generic-function" class="body-link clhs" target="_blank">entry in the Common Lisp HyperSpec</a> for this class.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<article>
<h1><a href="../concepts/#inheritance-structure-of-metaobject-classes">5.3 Inheritance structure of metaobject classes</a></h1>
<blockquote>
<p>The classes <a href="#standard-class" class="body-link class">standard-class</a>, <a href="#standard-direct-slot-definition" class="body-link class">standard-direct-slot-definition</a>, <a href="#standard-effective-slot-definition" class="body-link class">standard-effective-slot-definition</a>, <a href="#standard-method" class="body-link class">standard-method</a>, <a href="#standard-reader-method" class="body-link class">standard-reader-method</a>, <a href="#standard-writer-method" class="body-link class">standard-writer-method</a>, and <a href="#standard-generic-function" class="body-link class mention">standard-generic-function</a> are called <i>standard metaobject classes</i>. <span class="ellipsis">[...]</span></p>
</blockquote>
</article>
<article>
<h1><a href="../concepts/#initialization-of-generic-function-and-method-metaobjects">5.5.1 » Initialization of generic function and method metaobjects</a></h1>
<blockquote>
<div class="scroll">
<pre>
(let* ((gf (make-instance '<span class="mention">standard-generic-function</span>
</pre>
</div>
</blockquote>
</article>
</section>
</article>
</section>
<section id="method">
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<h1><span class="type">Class</span> <span class="name self">method</span></h1>
<p class="direct-superclasses"><a href="#metaobject" class="body-link class">metaobject</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>The superclass of all method metaobject classes.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>This class is an <em>abstract class</em> and is not intended to be instantiated. The results are undefined if an attempt is made to make an instance of this class with <a href="../generic-functions-and-methods/#make-instance" class="body-link generic-function">make-instance</a>.</p>
<p>See also the <a href="https://www.lispworks.com/documentation/HyperSpec/Body/t_method.htm#method" class="body-link clhs" target="_blank">entry in the Common Lisp HyperSpec</a> for this class.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<article>
<h1><a href="../concepts/#metaobjects">5.2 Metaobjects</a></h1>
<blockquote>
<p>For each kind of program element there is a corresponding <i>basic metaobject class</i>. These are the classes: <a href="#class" class="body-link class">class</a>, <a href="#slot-definition" class="body-link class">slot-definition</a>, <a href="#generic-function" class="body-link class">generic-function</a>, <a href="#method" class="body-link class mention">method</a>, and <a href="#method-combination" class="body-link class">method-combination</a>. <span class="ellipsis">[...]</span></p>
</blockquote>
</article>
</section>
</article>
</section>
<section id="standard-method">
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<h1><span class="type">Class</span> <span class="name self">standard-method</span></h1>
<p class="direct-superclasses"><a href="#method" class="body-link class">method</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>This class is a <em>standard metaobject class</em>. This is the class that the macro <a href="https://www.lispworks.com/documentation/HyperSpec/Body/m_defmet.htm#defmethod" class="body-link clhs" target="_blank">defmethod</a> uses by default. This is also a class on which user specializations are normally based.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>See also the <a href="https://www.lispworks.com/documentation/HyperSpec/Body/t_std_me.htm#standard-method" class="body-link clhs" target="_blank">entry in the Common Lisp HyperSpec</a> for this class.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<article>
<h1><a href="../concepts/#inheritance-structure-of-metaobject-classes">5.3 Inheritance structure of metaobject classes</a></h1>
<blockquote>
<p>The classes <a href="#standard-class" class="body-link class">standard-class</a>, <a href="#standard-direct-slot-definition" class="body-link class">standard-direct-slot-definition</a>, <a href="#standard-effective-slot-definition" class="body-link class">standard-effective-slot-definition</a>, <a href="#standard-method" class="body-link class mention">standard-method</a>, <a href="#standard-reader-method" class="body-link class">standard-reader-method</a>, <a href="#standard-writer-method" class="body-link class">standard-writer-method</a>, and <a href="#standard-generic-function" class="body-link class">standard-generic-function</a> are called <i>standard metaobject classes</i>. <span class="ellipsis">[...]</span></p>
</blockquote>
</article>
</section>
</article>
</section>
<section id="standard-accessor-method">
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<h1><span class="type">Class</span> <span class="name self">standard-accessor-method</span></h1>
<p class="direct-superclasses"><a href="#standard-method" class="body-link class">standard-method</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>The superclass of all standard accessor method classes.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>This class is an <em>abstract class</em> and is not intended to be instantiated. The results are undefined if an attempt is made to make an instance of this class with <a href="../generic-functions-and-methods/#make-instance" class="body-link generic-function">make-instance</a>.</p>
</section>
<section class="mentions none">
<h1>Mentions</h1>
<p>None in chapter 5, aside from <a href="../concepts/#table-5.1_figure">Table 5.1</a>.</p>
</section>
</article>
</section>
<section id="standard-reader-method">
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<h1><span class="type">Class</span> <span class="name self">standard-reader-method</span></h1>
<p class="direct-superclasses"><a href="#standard-accessor-method" class="body-link class">standard-accessor-method</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>This class is a <em>standard metaobject class</em>. This is the class that is returned by the method <a href="../generic-functions-and-methods/#reader-method-class_standard-class_standard-direct-slot-definition" class="body-link method"><span class="name">reader-method-class</span> (<var>class</var> standard-class) (<var>direct-slot</var> standard-direct-slot-definition) <span class="lambda-keyword">&rest</span> <var>initargs</var></a> and the method <a href="../generic-functions-and-methods/#reader-method-class_funcallable-standard-class_standard-direct-slot-definition" class="body-link method"><span class="name">reader-method-class</span> (<var>class</var> funcallable-standard-class) (<var>direct-slot</var> standard-direct-slot-definition) <span class="lambda-keyword">&rest</span> <var>initargs</var></a>. This is also a class on which user specializations are normally based.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<article>
<h1><a href="../concepts/#inheritance-structure-of-metaobject-classes">5.3 Inheritance structure of metaobject classes</a></h1>
<blockquote>
<p>The classes <a href="#standard-class" class="body-link class">standard-class</a>, <a href="#standard-direct-slot-definition" class="body-link class">standard-direct-slot-definition</a>, <a href="#standard-effective-slot-definition" class="body-link class">standard-effective-slot-definition</a>, <a href="#standard-method" class="body-link class">standard-method</a>, <a href="#standard-reader-method" class="body-link class mention">standard-reader-method</a>, <a href="#standard-writer-method" class="body-link class">standard-writer-method</a>, and <a href="#standard-generic-function" class="body-link class">standard-generic-function</a> are called <i>standard metaobject classes</i>. <span class="ellipsis">[...]</span></p>
</blockquote>
</article>
</section>
</article>
</section>
<section id="standard-writer-method">
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<h1><span class="type">Class</span> <span class="name self">standard-writer-method</span></h1>
<p class="direct-superclasses"><a href="#standard-accessor-method" class="body-link class">standard-accessor-method</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>This class is a <em>standard metaobject class</em>. This is the class that is returned by the method <a href="../generic-functions-and-methods/#writer-method-class_standard-class_standard-direct-slot-definition" class="body-link method"><span class="name">writer-method-class</span> (<var>class</var> standard-class) (<var>direct-slot</var> standard-direct-slot-definition) <span class="lambda-keyword">&rest</span> <var>initargs</var></a> and the method <a href="../generic-functions-and-methods/#writer-method-class_funcallable-standard-class_standard-direct-slot-definition" class="body-link method"><span class="name">writer-method-class</span> (<var>class</var> funcallable-standard-class) (<var>direct-slot</var> standard-direct-slot-definition) <span class="lambda-keyword">&rest</span> <var>initargs</var></a>. This is also a class on which user specializations are normally based.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<article>
<h1><a href="../concepts/#inheritance-structure-of-metaobject-classes">5.3 Inheritance structure of metaobject classes</a></h1>
<blockquote>
<p>The classes <a href="#standard-class" class="body-link class">standard-class</a>, <a href="#standard-direct-slot-definition" class="body-link class">standard-direct-slot-definition</a>, <a href="#standard-effective-slot-definition" class="body-link class">standard-effective-slot-definition</a>, <a href="#standard-method" class="body-link class">standard-method</a>, <a href="#standard-reader-method" class="body-link class">standard-reader-method</a>, <a href="#standard-writer-method" class="body-link class mention">standard-writer-method</a>, and <a href="#standard-generic-function" class="body-link class">standard-generic-function</a> are called <i>standard metaobject classes</i>. <span class="ellipsis">[...]</span></p>
</blockquote>
</article>
</section>
</article>
</section>
<section id="slot-definition">
<h1 class="breadcrumbs-bar">
<span class="section-relative-nav">
<a href="#slot-definition" class="anchor">⚓</a>
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<span class="breadcrumbs">
<a class="here">slot-definition</a>
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</h1>
<nav class="hanging-menu">
<ul>
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<article class="class definition">
<h1><span class="type">Class</span> <span class="name self">slot-definition</span></h1>
<p class="direct-superclasses"><a href="#metaobject" class="body-link class">metaobject</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>The superclass of all slot-definition metaobject classes.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>This class is an <em>abstract class</em> and is not intended to be instantiated. The results are undefined if an attempt is made to make an instance of this class with <a href="../generic-functions-and-methods/#make-instance" class="body-link generic-function">make-instance</a>.</p>
</section>
<section class="mentions">
<h1>Mentions</h1>
<article>
<h1><a href="../concepts/#metaobjects">5.2 Metaobjects</a></h1>
<blockquote>
<p>For each kind of program element there is a corresponding <i>basic metaobject class</i>. These are the classes: <a href="#class" class="body-link class">class</a>, <a href="#slot-definition" class="body-link class mention">slot-definition</a>, <a href="#generic-function" class="body-link class">generic-function</a>, <a href="#method" class="body-link class">method</a>, and <a href="#method-combination" class="body-link class">method-combination</a>. <span class="ellipsis">[...]</span></p>
</blockquote>
</article>
</section>
</article>
</section>
<section id="direct-slot-definition">
<h1 class="breadcrumbs-bar">
<span class="section-relative-nav">
<a href="#direct-slot-definition" class="anchor">⚓</a>
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<a class="here">direct-slot-definition</a>
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</nav>
<article class="class definition">
<h1><span class="type">Class</span> <span class="name self">direct-slot-definition</span></h1>
<p class="direct-superclasses"><a href="#slot-definition" class="body-link class">slot-definition</a></p>
<p class="metaclass"><b>Metaclass:</b> <a href="#standard-class" class="body-link class">standard-class</a></p>
<section class="description">
<h1>Description</h1>
<p>The superclass of all direct-slot-definition metaobject classes.</p>
</section>
<section class="comments-and-remarks">
<h1>Comments and remarks</h1>
<p>This class is an <em>abstract class</em> and is not intended to be instantiated. The results are undefined if an attempt is made to make an instance of this class with <a href="../generic-functions-and-methods/#make-instance" class="body-link generic-function">make-instance</a>.</p>
</section>
<section class="mentions none">
<h1>Mentions</h1>
<p>None in chapter 5, aside from <a href="../concepts/#table-5.1_figure">Table 5.1</a>.</p>
</section>
</article>
</section>
<section id="effective-slot-definition">
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