84 lines
3.7 KiB
HTML
84 lines
3.7 KiB
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>Feature Tracking (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="Options-and-Config.html" rel="up" title="Options and Config">
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<link href="Runtime-Options.html" rel="next" title="Runtime Options">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Feature-Tracking">
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<div class="nav-panel">
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<p>
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Next: <a href="Runtime-Options.html" accesskey="n" rel="next">Runtime Options</a>, Previous: <a href="Build-Config.html" accesskey="p" rel="prev">Configuration, Build and Installation</a>, Up: <a href="Options-and-Config.html" accesskey="u" rel="up">Configuration, Features and Runtime Options</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="Feature-Tracking-1"><span>6.23.2 Feature Tracking<a class="copiable-link" href="#Feature-Tracking-1"> ¶</a></span></h4>
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<p>Guile has a Scheme level variable <code class="code">*features*</code> that keeps track to
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some extent of the features that are available in a running Guile.
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<code class="code">*features*</code> is a list of symbols, for example <code class="code">threads</code>, each
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of which describes a feature of the running Guile process.
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</p>
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<dl class="first-defvr first-defvar-alias-first-defvr">
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<dt class="defvr defvar-alias-defvr" id="index-_002afeatures_002a"><span class="category-def">Variable: </span><span><strong class="def-name">*features*</strong><a class="copiable-link" href="#index-_002afeatures_002a"> ¶</a></span></dt>
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<dd><p>A list of symbols describing available features of the Guile process.
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</p></dd></dl>
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<p>You shouldn’t modify the <code class="code">*features*</code> variable directly using
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<code class="code">set!</code>. Instead, see the procedures that are provided for this
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purpose in the following subsection.
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</p>
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<ul class="mini-toc">
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<li><a href="Feature-Manipulation.html" accesskey="1">Feature Manipulation</a></li>
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<li><a href="Common-Feature-Symbols.html" accesskey="2">Common Feature Symbols</a></li>
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</ul>
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</div>
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</body>
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</html>
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