92 lines
4.4 KiB
HTML
92 lines
4.4 KiB
HTML
|
<!DOCTYPE html>
|
||
|
|
<html>
|
||
|
|
<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<!-- This manual documents Guile version 3.0.10.
|
||
|
|
|
||
|
|
Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
|
||
|
|
Inc.
|
||
|
|
|
||
|
|
Copyright (C) 2021 Maxime Devos
|
||
|
|
|
||
|
|
Copyright (C) 2024 Tomas Volf
|
||
|
|
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
||
|
|
any later version published by the Free Software Foundation; with no
|
||
|
|
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
|
||
|
|
copy of the license is included in the section entitled "GNU Free
|
||
|
|
Documentation License." -->
|
||
|
|
<title>Extending Primitives (Guile Reference Manual)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Extending Primitives (Guile Reference Manual)">
|
||
|
|
<meta name="keywords" content="Extending Primitives (Guile Reference Manual)">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content=".texi2any-real">
|
||
|
|
<meta name="viewport" content="width=device-width,initial-scale=1">
|
||
|
|
|
||
|
|
<link href="index.html" rel="start" title="Top">
|
||
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="Methods-and-Generic-Functions.html" rel="up" title="Methods and Generic Functions">
|
||
|
|
<link href="Merging-Generics.html" rel="next" title="Merging Generics">
|
||
|
|
<link href="Accessors.html" rel="prev" title="Accessors">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
|
||
|
|
span:hover a.copiable-link {visibility: visible}
|
||
|
|
strong.def-name {font-family: monospace; font-weight: bold; font-size: larger}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
<div class="subsection-level-extent" id="Extending-Primitives">
|
||
|
|
<div class="nav-panel">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Merging-Generics.html" accesskey="n" rel="next">Merging Generics</a>, Previous: <a href="Accessors.html" accesskey="p" rel="prev">Accessors</a>, Up: <a href="Methods-and-Generic-Functions.html" accesskey="u" rel="up">Methods and Generic Functions</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>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<h4 class="subsection" id="Extending-Primitives-1"><span>8.6.2 Extending Primitives<a class="copiable-link" href="#Extending-Primitives-1"> ¶</a></span></h4>
|
||
|
|
|
||
|
|
<p>Many of Guile’s primitive procedures can be extended by giving them a
|
||
|
|
generic function definition that operates in conjunction with their
|
||
|
|
normal C-coded implementation. When a primitive is extended in this
|
||
|
|
way, it behaves like a generic function with the C-coded implementation
|
||
|
|
as its default method.
|
||
|
|
</p>
|
||
|
|
<p>This extension happens automatically if a method is defined (by a
|
||
|
|
<code class="code">define-method</code> call) for a variable whose current value is a
|
||
|
|
primitive. But it can also be forced by calling
|
||
|
|
<code class="code">enable-primitive-generic!</code>.
|
||
|
|
</p>
|
||
|
|
<dl class="first-deffn">
|
||
|
|
<dt class="deffn" id="index-enable_002dprimitive_002dgeneric_0021"><span class="category-def">primitive procedure: </span><span><strong class="def-name">enable-primitive-generic!</strong> <var class="def-var-arguments">primitive</var><a class="copiable-link" href="#index-enable_002dprimitive_002dgeneric_0021"> ¶</a></span></dt>
|
||
|
|
<dd><p>Force the creation of a generic function definition for
|
||
|
|
<var class="var">primitive</var>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<p>Once the generic function definition for a primitive has been created,
|
||
|
|
it can be retrieved using <code class="code">primitive-generic-generic</code>.
|
||
|
|
</p>
|
||
|
|
<dl class="first-deffn">
|
||
|
|
<dt class="deffn" id="index-primitive_002dgeneric_002dgeneric"><span class="category-def">primitive procedure: </span><span><strong class="def-name">primitive-generic-generic</strong> <var class="def-var-arguments">primitive</var><a class="copiable-link" href="#index-primitive_002dgeneric_002dgeneric"> ¶</a></span></dt>
|
||
|
|
<dd><p>Return the generic function definition of <var class="var">primitive</var>.
|
||
|
|
</p>
|
||
|
|
<p><code class="code">primitive-generic-generic</code> raises an error if <var class="var">primitive</var>
|
||
|
|
is not a primitive with generic capability.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|