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90 lines
4.1 KiB
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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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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>SRFI-55 (Guile Reference Manual)</title>
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<div class="subsection-level-extent" id="SRFI_002d55">
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<p>
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Next: <a href="SRFI_002d60.html" accesskey="n" rel="next">SRFI-60 - Integers as Bits</a>, Previous: <a href="SRFI_002d46.html" accesskey="p" rel="prev">SRFI-46 Basic syntax-rules Extensions</a>, Up: <a href="SRFI-Support.html" accesskey="u" rel="up">SRFI Support 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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<h4 class="subsection" id="SRFI_002d55-_002d-Requiring-Features"><span>7.5.33 SRFI-55 - Requiring Features<a class="copiable-link" href="#SRFI_002d55-_002d-Requiring-Features"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-SRFI_002d55"></a>
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<p>SRFI-55 provides <code class="code">require-extension</code> which is a portable
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mechanism to load selected SRFI modules. This is implemented in the
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Guile core, there’s no module needed to get SRFI-55 itself.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-require_002dextension"><span class="category-def">library syntax: </span><span><strong class="def-name">require-extension</strong> <var class="def-var-arguments">clause1 clause2 …</var><a class="copiable-link" href="#index-require_002dextension"> ¶</a></span></dt>
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<dd><p>Require the features of <var class="var">clause1</var> <var class="var">clause2</var> … , throwing
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an error if any are unavailable.
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</p>
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<p>A <var class="var">clause</var> is of the form <code class="code">(<var class="var">identifier</var> arg...)</code>. The
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only <var class="var">identifier</var> currently supported is <code class="code">srfi</code> and the
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arguments are SRFI numbers. For example to get SRFI-1 and SRFI-6,
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</p>
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<div class="example">
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<pre class="example-preformatted">(require-extension (srfi 1 6))
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</pre></div>
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<p><code class="code">require-extension</code> can only be used at the top-level.
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</p>
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<p>A Guile-specific program can simply <code class="code">use-modules</code> to load SRFIs
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not already in the core, <code class="code">require-extension</code> is for programs
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designed to be portable to other Scheme implementations.
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</p></dd></dl>
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