121 lines
5.9 KiB
HTML
121 lines
5.9 KiB
HTML
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<!-- This manual describes ASDF, a system definition facility
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https://common-lisp.net/project/asdf/asdf.html.
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ASDF Copyright (C) 2001-2019 Daniel Barlow and contributors.
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This manual Copyright (C) 2001-2019 Daniel Barlow and contributors.
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This manual revised (C) 2009-2019 Robert P. Goldman and Francois-Rene Rideau.
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<title>Functions (ASDF 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="The-object-model-of-ASDF.html" rel="up" title="The object model of ASDF">
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<div class="section" id="Functions">
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<div class="header">
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<p>
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Next: <a href="Parsing-system-definitions.html" accesskey="n" rel="next">Parsing system definitions</a>, Previous: <a href="Dependencies.html" accesskey="p" rel="prev">Dependencies</a>, Up: <a href="The-object-model-of-ASDF.html" accesskey="u" rel="up">The Object model of ASDF</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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<span id="Functions-1"></span><h3 class="section">7.4 Functions</h3>
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<dl class="def">
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<dt id="index-version_002dsatisfies-1"><span class="category">Function: </span><span><strong>version-satisfies</strong> <em><var>version</var> <var>version-spec</var></em><a href='Functions.html#index-version_002dsatisfies-1' class='copiable-anchor'> ¶</a></span></dt>
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<dd><p>Does <var>version</var> satisfy the <var>version-spec</var>. A generic function.
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ASDF provides built-in methods for <var>version</var> being a <code>component</code> or <code>string</code>.
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<var>version-spec</var> should be a string.
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If it’s a component, its version is extracted as a string before further processing.
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</p>
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<p>A version string satisfies the version-spec if after parsing,
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the former is no older than the latter.
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Therefore <code>"1.9.1"</code>, <code>"1.9.2"</code> and <code>"1.10"</code> all satisfy <code>"1.9.1"</code>,
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but <code>"1.8.4"</code> or <code>"1.9"</code> do not.
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For more information about how <code>version-satisfies</code> parses and interprets
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version strings and specifications,
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see <a href="The-defsystem-grammar.html#Version-specifiers">Version specifiers</a> and
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<a href="Common-attributes-of-components.html">Common attributes of components</a>.
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</p>
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<p>Note that in versions of ASDF prior to 3.0.1,
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including the entire ASDF 1 and ASDF 2 series,
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<code>version-satisfies</code> would also require that the version and the version-spec
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have the same major version number (the first integer in the list);
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if the major version differed, the version would be considered as not matching the spec.
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But that feature was not documented, therefore presumably not relied upon,
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whereas it was a nuisance to several users.
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Starting with ASDF 3.0.1,
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<code>version-satisfies</code> does not treat the major version number specially,
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and returns T simply if the first argument designates a version that isn’t older
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than the one specified as a second argument.
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If needs be, the <code>(:version ...)</code> syntax for specifying dependencies
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could be in the future extended to specify an exclusive upper bound for compatible versions
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as well as an inclusive lower bound.
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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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