115 lines
5.6 KiB
HTML
115 lines
5.6 KiB
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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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>Modules (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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<div class="section-level-extent" id="Modules">
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<p>
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Next: <a href="Foreign-Function-Interface.html" accesskey="n" rel="next">Foreign Function Interface</a>, Previous: <a href="Memory-Management.html" accesskey="p" rel="prev">Memory Management and Garbage Collection</a>, Up: <a href="API-Reference.html" accesskey="u" rel="up">API Reference</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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<hr>
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<h3 class="section" id="Modules-1"><span>6.18 Modules<a class="copiable-link" href="#Modules-1"> ¶</a></span></h3>
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<a class="index-entry-id" id="index-modules"></a>
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<p>When programs become large, naming conflicts can occur when a function
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or global variable defined in one file has the same name as a function
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or global variable in another file. Even just a <em class="emph">similarity</em>
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between function names can cause hard-to-find bugs, since a programmer
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might type the wrong function name.
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</p>
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<p>The approach used to tackle this problem is called <em class="emph">information
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encapsulation</em>, which consists of packaging functional units into a
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given name space that is clearly separated from other name spaces.
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<a class="index-entry-id" id="index-encapsulation"></a>
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<a class="index-entry-id" id="index-information-encapsulation"></a>
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<a class="index-entry-id" id="index-name-space"></a>
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</p>
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<p>The language features that allow this are usually called <em class="emph">the
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module system</em> because programs are broken up into modules that are
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compiled separately (or loaded separately in an interpreter).
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</p>
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<p>Older languages, like C, have limited support for name space
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manipulation and protection. In C a variable or function is public by
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default, and can be made local to a module with the <code class="code">static</code>
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keyword. But you cannot reference public variables and functions from
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another module with different names.
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</p>
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<p>More advanced module systems have become a common feature in recently
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designed languages: ML, Python, Perl, and Modula 3 all allow the
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<em class="emph">renaming</em> of objects from a foreign module, so they will not
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clutter the global name space.
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<a class="index-entry-id" id="index-name-space-_002d-private"></a>
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</p>
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<p>In addition, Guile offers variables as first-class objects. They can
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be used for interacting with the module system.
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</p>
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<ul class="mini-toc">
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<li><a href="General-Information-about-Modules.html" accesskey="1">General Information about Modules</a></li>
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<li><a href="Using-Guile-Modules.html" accesskey="2">Using Guile Modules</a></li>
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<li><a href="Creating-Guile-Modules.html" accesskey="3">Creating Guile Modules</a></li>
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<li><a href="Modules-and-the-File-System.html" accesskey="4">Modules and the File System</a></li>
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<li><a href="R6RS-Version-References.html" accesskey="5">R6RS Version References</a></li>
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<li><a href="R6RS-Libraries.html" accesskey="6">R6RS Libraries</a></li>
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<li><a href="Variables.html" accesskey="7">Variables</a></li>
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<li><a href="Module-System-Reflection.html" accesskey="8">Module System Reflection</a></li>
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<li><a href="Declarative-Modules.html" accesskey="9">Declarative Modules</a></li>
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<li><a href="Accessing-Modules-from-C.html">Accessing Modules from C</a></li>
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<li><a href="provide-and-require.html">provide and require</a></li>
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<li><a href="Environments.html">Environments</a></li>
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</ul>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Foreign-Function-Interface.html">Foreign Function Interface</a>, Previous: <a href="Memory-Management.html">Memory Management and Garbage Collection</a>, Up: <a href="API-Reference.html">API Reference</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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