76 lines
3.6 KiB
HTML
76 lines
3.6 KiB
HTML
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<!DOCTYPE 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>Binding Reflection (Guile Reference Manual)</title>
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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="Binding-Constructs.html" rel="up" title="Binding Constructs">
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<link href="Binding-Multiple-Values.html" rel="next" title="Binding Multiple Values">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Binding-Reflection">
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<div class="nav-panel">
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<p>
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Next: <a href="Binding-Multiple-Values.html" accesskey="n" rel="next">Binding multiple return values</a>, Previous: <a href="Internal-Definitions.html" accesskey="p" rel="prev">Internal definitions</a>, Up: <a href="Binding-Constructs.html" accesskey="u" rel="up">Definitions and Variable Bindings</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="Querying-variable-bindings"><span>6.10.4 Querying variable bindings<a class="copiable-link" href="#Querying-variable-bindings"> ¶</a></span></h4>
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<p>Guile provides a procedure for checking whether a symbol is bound in the
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top level environment.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-defined_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">defined?</strong> <var class="def-var-arguments">sym [module]</var><a class="copiable-link" href="#index-defined_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fdefined_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_defined_p</strong> <var class="def-var-arguments">(sym, module)</var><a class="copiable-link" href="#index-scm_005fdefined_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">sym</var> is defined in the module <var class="var">module</var> or
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the current module when <var class="var">module</var> is not specified; otherwise return
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<code class="code">#f</code>.
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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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