152 lines
8.6 KiB
HTML
152 lines
8.6 KiB
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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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copy of the license is included in the section entitled "GNU Free
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<title>Method Definition Internals (Guile Reference Manual)</title>
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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="The-Metaobject-Protocol.html" rel="up" title="The Metaobject Protocol">
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<link href="Generic-Function-Internals.html" rel="next" title="Generic Function Internals">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Method-Definition-Internals">
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<div class="nav-panel">
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<p>
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Next: <a href="Generic-Function-Internals.html" accesskey="n" rel="next">Generic Function Internals</a>, Previous: <a href="Method-Definition.html" accesskey="p" rel="prev">Method Definition</a>, Up: <a href="The-Metaobject-Protocol.html" accesskey="u" rel="up">The Metaobject Protocol</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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<h4 class="subsection" id="Method-Definition-Internals-1"><span>8.11.8 Method Definition Internals<a class="copiable-link" href="#Method-Definition-Internals-1"> ¶</a></span></h4>
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<p><code class="code">define-method</code>:
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</p>
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<ul class="itemize mark-bullet">
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<li>checks the form of the first parameter, and applies the following steps
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to the accessor’s setter if it has the <code class="code">(setter …)</code> form
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</li><li>interpolates a call to <code class="code">define-generic</code> or <code class="code">define-accessor</code>
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if a generic function is not already defined with the supplied name
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</li><li>calls <code class="code">method</code> with the <var class="var">parameter</var>s and <var class="var">body</var>, to make a
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new method instance
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</li><li>calls <code class="code">add-method!</code> to add this method to the relevant generic
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function.
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</li></ul>
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<dl class="first-deffn">
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<dt class="deffn" id="index-method"><span class="category-def">syntax: </span><span><strong class="def-name">method</strong> <var class="def-var-arguments">(parameter …) body …</var><a class="copiable-link" href="#index-method"> ¶</a></span></dt>
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<dd><p>Make a method whose specializers are defined by the classes in
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<var class="var">parameter</var>s and whose procedure definition is constructed from the
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<var class="var">parameter</var> symbols and <var class="var">body</var> forms.
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</p>
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<p>The <var class="var">parameter</var> and <var class="var">body</var> parameters should be as for
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<code class="code">define-method</code> (see <a class="pxref" href="Methods-and-Generic-Functions.html">define-method</a>).
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</p></dd></dl>
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<p><code class="code">method</code>:
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</p>
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<ul class="itemize mark-bullet">
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<li>extracts formals and specializing classes from the <var class="var">parameter</var>s,
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defaulting the class for unspecialized parameters to <code class="code"><top></code>
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</li><li>creates a closure using the formals and the <var class="var">body</var> forms
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</li><li>calls <code class="code">make</code> with metaclass <code class="code"><method></code> and the specializers
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and closure using the <code class="code">#:specializers</code> and <code class="code">#:procedure</code>
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keywords.
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</li></ul>
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<dl class="first-deffn">
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<dt class="deffn" id="index-make_002dmethod"><span class="category-def">procedure: </span><span><strong class="def-name">make-method</strong> <var class="def-var-arguments">specializers procedure</var><a class="copiable-link" href="#index-make_002dmethod"> ¶</a></span></dt>
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<dd><p>Make a method using <var class="var">specializers</var> and <var class="var">procedure</var>.
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</p>
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<p><var class="var">specializers</var> should be a list of classes that specifies the
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parameter combinations to which this method will be applicable.
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</p>
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<p><var class="var">procedure</var> should be the closure that will applied to the generic
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function parameters when this method is invoked.
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</p></dd></dl>
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<p><code class="code">make-method</code> is a simple wrapper around <code class="code">make</code> with metaclass
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<code class="code"><method></code>.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-add_002dmethod_0021"><span class="category-def">generic: </span><span><strong class="def-name">add-method!</strong> <var class="def-var-arguments">target method</var><a class="copiable-link" href="#index-add_002dmethod_0021"> ¶</a></span></dt>
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<dd><p>Generic function for adding method <var class="var">method</var> to <var class="var">target</var>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-add_002dmethod_0021-1"><span class="category-def">method: </span><span><strong class="def-name">add-method!</strong> <var class="def-var-arguments">(generic <generic>) (method <method>)</var><a class="copiable-link" href="#index-add_002dmethod_0021-1"> ¶</a></span></dt>
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<dd><p>Add method <var class="var">method</var> to the generic function <var class="var">generic</var>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-add_002dmethod_0021-2"><span class="category-def">method: </span><span><strong class="def-name">add-method!</strong> <var class="def-var-arguments">(proc <procedure>) (method <method>)</var><a class="copiable-link" href="#index-add_002dmethod_0021-2"> ¶</a></span></dt>
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<dd><p>If <var class="var">proc</var> is a procedure with generic capability (see <a class="pxref" href="Extending-Primitives.html">generic-capability?</a>), upgrade it to a primitive generic
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and add <var class="var">method</var> to its generic function definition.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-add_002dmethod_0021-3"><span class="category-def">method: </span><span><strong class="def-name">add-method!</strong> <var class="def-var-arguments">(pg <primitive-generic>) (method <method>)</var><a class="copiable-link" href="#index-add_002dmethod_0021-3"> ¶</a></span></dt>
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<dd><p>Add method <var class="var">method</var> to the generic function definition of <var class="var">pg</var>.
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</p>
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<p>Implementation: <code class="code">(add-method! (primitive-generic-generic pg) method)</code>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-add_002dmethod_0021-4"><span class="category-def">method: </span><span><strong class="def-name">add-method!</strong> <var class="def-var-arguments">(whatever <top>) (method <method>)</var><a class="copiable-link" href="#index-add_002dmethod_0021-4"> ¶</a></span></dt>
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<dd><p>Raise an error indicating that <var class="var">whatever</var> is not a valid generic
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function.
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Generic-Function-Internals.html">Generic Function Internals</a>, Previous: <a href="Method-Definition.html">Method Definition</a>, Up: <a href="The-Metaobject-Protocol.html">The Metaobject Protocol</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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</body>
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