89 lines
4.2 KiB
HTML
89 lines
4.2 KiB
HTML
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<!DOCTYPE html>
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<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>SRFI-111 (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="SRFI-Support.html" rel="up" title="SRFI Support">
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<link href="SRFI_002d119.html" rel="next" title="SRFI-119">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="SRFI_002d111">
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<div class="nav-panel">
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<p>
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Next: <a href="SRFI_002d119.html" accesskey="n" rel="next">SRFI-119 Wisp: simpler indentation-sensitive Scheme.</a>, Previous: <a href="SRFI_002d105.html" accesskey="p" rel="prev">SRFI-105 Curly-infix expressions.</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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</div>
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<hr>
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<h4 class="subsection" id="SRFI_002d111-Boxes_002e"><span>7.5.45 SRFI-111 Boxes.<a class="copiable-link" href="#SRFI_002d111-Boxes_002e"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-SRFI_002d111"></a>
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<p><a class="uref" href="http://srfi.schemers.org/srfi-111/srfi-111.html">SRFI-111</a>
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provides boxes: objects with a single mutable cell.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-box"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">box</strong> <var class="def-var-arguments">value</var><a class="copiable-link" href="#index-box"> ¶</a></span></dt>
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<dd><p>Return a newly allocated box whose contents is initialized to
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<var class="var">value</var>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-box_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">box?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-box_003f"> ¶</a></span></dt>
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<dd><p>Return true if <var class="var">obj</var> is a box, otherwise return false.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-unbox"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">unbox</strong> <var class="def-var-arguments">box</var><a class="copiable-link" href="#index-unbox"> ¶</a></span></dt>
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<dd><p>Return the current contents of <var class="var">box</var>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-set_002dbox_0021"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">set-box!</strong> <var class="def-var-arguments">box value</var><a class="copiable-link" href="#index-set_002dbox_0021"> ¶</a></span></dt>
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<dd><p>Set the contents of <var class="var">box</var> to <var class="var">value</var>.
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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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