95 lines
5.5 KiB
HTML
95 lines
5.5 KiB
HTML
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<!DOCTYPE html>
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<html>
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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>Handling Invocation Errors (Guile Reference Manual)</title>
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<meta name="description" content="Handling Invocation Errors (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="Methods-and-Generic-Functions.html" rel="up" title="Methods and Generic Functions">
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<link href="Generic-Function-and-Method-Examples.html" rel="prev" title="Generic Function and Method Examples">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Handling-Invocation-Errors">
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<div class="nav-panel">
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<p>
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Previous: <a href="Generic-Function-and-Method-Examples.html" accesskey="p" rel="prev">Generic Function and Method Examples</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>
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</div>
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<hr>
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<h4 class="subsection" id="Handling-Invocation-Errors-1"><span>8.6.6 Handling Invocation Errors<a class="copiable-link" href="#Handling-Invocation-Errors-1"> ¶</a></span></h4>
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<p>If a generic function is invoked with a combination of parameters for
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which there is no applicable method, GOOPS raises an error.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-no_002dmethod"><span class="category-def">generic: </span><span><strong class="def-name">no-method</strong><a class="copiable-link" href="#index-no_002dmethod"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-no_002dmethod-1"><span class="category-def">method: </span><span><strong class="def-name">no-method</strong> <var class="def-var-arguments">(gf <generic>) args</var><a class="copiable-link" href="#index-no_002dmethod-1"> ¶</a></span></dt>
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<dd><p>When an application invokes a generic function, and no methods at all
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have been defined for that generic function, GOOPS calls the
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<code class="code">no-method</code> generic function. The default method calls
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<code class="code">goops-error</code> with an appropriate message.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-no_002dapplicable_002dmethod"><span class="category-def">generic: </span><span><strong class="def-name">no-applicable-method</strong><a class="copiable-link" href="#index-no_002dapplicable_002dmethod"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-no_002dapplicable_002dmethod-1"><span class="category-def">method: </span><span><strong class="def-name">no-applicable-method</strong> <var class="def-var-arguments">(gf <generic>) args</var><a class="copiable-link" href="#index-no_002dapplicable_002dmethod-1"> ¶</a></span></dt>
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<dd><p>When an application applies a generic function to a set of arguments,
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and no methods have been defined for those argument types, GOOPS calls
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the <code class="code">no-applicable-method</code> generic function. The default method
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calls <code class="code">goops-error</code> with an appropriate message.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-no_002dnext_002dmethod"><span class="category-def">generic: </span><span><strong class="def-name">no-next-method</strong><a class="copiable-link" href="#index-no_002dnext_002dmethod"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-no_002dnext_002dmethod-1"><span class="category-def">method: </span><span><strong class="def-name">no-next-method</strong> <var class="def-var-arguments">(gf <generic>) args</var><a class="copiable-link" href="#index-no_002dnext_002dmethod-1"> ¶</a></span></dt>
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<dd><p>When a generic function method calls <code class="code">(next-method)</code> to invoke the
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next less specialized method for that generic function, and no less
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specialized methods have been defined for the current generic function
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arguments, GOOPS calls the <code class="code">no-next-method</code> generic function. The
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default method calls <code class="code">goops-error</code> with an appropriate message.
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</p></dd></dl>
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</div>
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</body>
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</html>
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