89 lines
3.7 KiB
HTML
89 lines
3.7 KiB
HTML
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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-11 (Guile Reference Manual)</title>
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<div class="subsection-level-extent" id="SRFI_002d11">
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Next: <a href="SRFI_002d13.html" accesskey="n" rel="next">SRFI-13 - String Library</a>, Previous: <a href="SRFI_002d10.html" accesskey="p" rel="prev">SRFI-10 - Hash-Comma Reader Extension</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_002d11-_002d-let_002dvalues"><span>7.5.10 SRFI-11 - let-values<a class="copiable-link" href="#SRFI_002d11-_002d-let_002dvalues"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-SRFI_002d11"></a>
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<a class="index-entry-id" id="index-let_002dvalues"></a>
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<a class="index-entry-id" id="index-let_002a_002dvalues"></a>
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<p>This module implements the binding forms for multiple values
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<code class="code">let-values</code> and <code class="code">let*-values</code>. These forms are similar to
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<code class="code">let</code> and <code class="code">let*</code> (see <a class="pxref" href="Local-Bindings.html">Local Variable Bindings</a>), but they support
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binding of the values returned by multiple-valued expressions.
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</p>
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<p>Write <code class="code">(use-modules (srfi srfi-11))</code> to make the bindings
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available.
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(let-values (((x y) (values 1 2))
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((z f) (values 3 4)))
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(+ x y z f))
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⇒
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10
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</pre></div>
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<p><code class="code">let-values</code> performs all bindings simultaneously, which means that
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no expression in the binding clauses may refer to variables bound in the
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same clause list. <code class="code">let*-values</code>, on the other hand, performs the
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bindings sequentially, just like <code class="code">let*</code> does for single-valued
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expressions.
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</p>
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