83 lines
3.5 KiB
HTML
83 lines
3.5 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>Structures (Guile Reference Manual)</title>
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<meta name="description" content="Structures (Guile Reference Manual)">
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<meta name="keywords" content="Structures (Guile Reference Manual)">
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<meta name="distribution" content="global">
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<meta name="Generator" content=".texi2any-real">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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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="Data-Types.html" rel="up" title="Data Types">
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<link href="Dictionary-Types.html" rel="next" title="Dictionary Types">
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<link href="Records.html" rel="prev" title="Records">
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<style type="text/css">
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a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
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</style>
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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="Structures">
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<div class="nav-panel">
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<p>
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Next: <a href="Dictionary-Types.html" accesskey="n" rel="next">Dictionary Types</a>, Previous: <a href="Records.html" accesskey="p" rel="prev">Records</a>, Up: <a href="Data-Types.html" accesskey="u" rel="up">Data Types</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="Structures-1"><span>6.6.18 Structures<a class="copiable-link" href="#Structures-1"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-Structures"></a>
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<p>A <em class="dfn">structure</em> is a first class data type which holds Scheme values
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or C words in fields numbered 0 upwards. A <em class="dfn">vtable</em> is a structure
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that represents a structure type, giving field types and permissions,
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and an optional print function for <code class="code">write</code> etc.
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</p>
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<p>Structures are lower level than records (see <a class="pxref" href="Records.html">Records</a>). Usually,
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when you need to represent structured data, you just want to use
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records. But sometimes you need to implement new kinds of structured
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data abstractions, and for that purpose structures are useful. Indeed,
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records in Guile are implemented with structures.
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</p>
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<ul class="mini-toc">
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<li><a href="Vtables.html" accesskey="1">Vtables</a></li>
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<li><a href="Structure-Basics.html" accesskey="2">Structure Basics</a></li>
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<li><a href="Vtable-Contents.html" accesskey="3">Vtable Contents</a></li>
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<li><a href="Meta_002dVtables.html" accesskey="4">Meta-Vtables</a></li>
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<li><a href="Vtable-Example.html" accesskey="5">Vtable Example</a></li>
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</ul>
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</div>
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</body>
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</html>
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