87 lines
4 KiB
HTML
87 lines
4 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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>Copying (Guile Reference Manual)</title>
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<meta name="description" content="Copying (Guile Reference Manual)">
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<meta name="keywords" content="Copying (Guile Reference Manual)">
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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="Utility-Functions.html" rel="up" title="Utility Functions">
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<link href="General-Conversion.html" rel="next" title="General Conversion">
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<link href="Sorting.html" rel="prev" title="Sorting">
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<style type="text/css">
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Copying">
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<div class="nav-panel">
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<p>
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Next: <a href="General-Conversion.html" accesskey="n" rel="next">General String Conversion</a>, Previous: <a href="Sorting.html" accesskey="p" rel="prev">Sorting</a>, Up: <a href="Utility-Functions.html" accesskey="u" rel="up">General Utility Functions</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="Copying-Deep-Structures"><span>6.9.4 Copying Deep Structures<a class="copiable-link" href="#Copying-Deep-Structures"> ¶</a></span></h4>
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<p>The procedures for copying lists (see <a class="pxref" href="Lists.html">Lists</a>) only produce a flat
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copy of the input list, and currently Guile does not even contain
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procedures for copying vectors. The <code class="code">(ice-9 copy-tree)</code> module
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contains a <code class="code">copy-tree</code> function that can be used for this purpose,
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as it does not only copy the spine of a list, but also copies any pairs
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in the cars of the input lists.
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</p>
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<div class="example">
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<pre class="example-preformatted">(use-modules (ice-9 copy-tree))
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</pre></div>
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<dl class="first-deffn">
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<dt class="deffn" id="index-copy_002dtree"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">copy-tree</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-copy_002dtree"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fcopy_005ftree"><span class="category-def">C Function: </span><span><strong class="def-name">scm_copy_tree</strong> <var class="def-var-arguments">(obj)</var><a class="copiable-link" href="#index-scm_005fcopy_005ftree"> ¶</a></span></dt>
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<dd><p>Recursively copy the data tree that is bound to <var class="var">obj</var>, and return
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the new data structure. <code class="code">copy-tree</code> recurses down the
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contents of both pairs and vectors (since both cons cells and vector
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cells may point to arbitrary objects), and stops recursing when it hits
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any other object.
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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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