89 lines
3.4 KiB
HTML
89 lines
3.4 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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<title>provide and require (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="Modules.html" rel="up" title="Modules">
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<link href="Environments.html" rel="next" title="Environments">
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<body lang="en">
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<div class="subsection-level-extent" id="provide-and-require">
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<div class="nav-panel">
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<p>
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Next: <a href="Environments.html" accesskey="n" rel="next">Environments</a>, Previous: <a href="Accessing-Modules-from-C.html" accesskey="p" rel="prev">Accessing Modules from C</a>, Up: <a href="Modules.html" accesskey="u" rel="up">Modules</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="provide-and-require-1"><span>6.18.11 provide and require<a class="copiable-link" href="#provide-and-require-1"> ¶</a></span></h4>
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<p>Aubrey Jaffer, mostly to support his portable Scheme library SLIB,
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implemented a provide/require mechanism for many Scheme implementations.
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Library files in SLIB <em class="emph">provide</em> a feature, and when user programs
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<em class="emph">require</em> that feature, the library file is loaded in.
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</p>
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<p>For example, the file <samp class="file">random.scm</samp> in the SLIB package contains the
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line
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(provide 'random)
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</pre></div>
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<p>so to use its procedures, a user would type
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(require 'random)
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</pre></div>
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<p>and they would magically become available, <em class="emph">but still have the same
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names!</em> So this method is nice, but not as good as a full-featured
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module system.
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</p>
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<p>When SLIB is used with Guile, provide and require can be used to access
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its facilities.
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</p>
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</div>
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</body>
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</html>
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