201 lines
6.5 KiB
HTML
201 lines
6.5 KiB
HTML
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-->
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</style>
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</head>
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<body lang="en">
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<div class="section-level-extent" id="Structures">
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<div class="nav-panel">
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<p>
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Next: <a href="Conditions.html" accesskey="n" rel="next">Conditions</a>, Previous: <a href="Objects.html" accesskey="p" rel="prev">Objects</a>, Up: <a href="Standards.html" accesskey="u" rel="up">Standards</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indexes.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<h3 class="section" id="Structures-1">2.6 Structures</h3>
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<ul class="mini-toc">
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<li><a href="Structures.html#Redefining-a-defstruct-structure" accesskey="1">Redefining a defstruct structure</a></li>
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<li><a href="Structures.html#C-Reference-6" accesskey="2">C Reference</a></li>
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</ul>
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<div class="subsection-level-extent" id="Redefining-a-defstruct-structure">
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<h4 class="subsection">2.6.1 Redefining a defstruct structure</h4>
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<p><span class="r">ANSI Common-Lisp</span> says that consequences of redefining a <code class="code">defstruct</code> are
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undefined. ECL defines this behavior to signal an error if the new
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structure is not compatible. Structures are incompatible when:
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</p>
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<dl class="table">
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<dt>They have a different number of slots</dt>
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<dd><p>This is particularly important for other structures which could have
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included the current one and for already defined instances.
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</p>
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</dd>
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<dt>Slot name, type or offset is different</dt>
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<dd><p>Binary compatibility between old and new instances.
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</p></dd>
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</dl>
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</div>
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<div class="subsection-level-extent" id="C-Reference-6">
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<h4 class="subsection">2.6.2 C Reference</h4>
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<ul class="mini-toc">
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<li><a href="Structures.html#ANSI-Dictionary-4" accesskey="1">ANSI Dictionary</a></li>
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</ul>
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<div class="subsubsection-level-extent" id="ANSI-Dictionary-4">
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<h4 class="subsubsection">2.6.2.1 ANSI Dictionary</h4>
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<p>Common Lisp and C equivalence
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</p>
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<table class="multitable">
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<thead><tr><th width="30%">Lisp symbol</th><th width="70%">C function</th></tr></thead>
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<tbody><tr><td width="30%"><a class="url" href="http://www.lispworks.com/documentation/HyperSpec/Body/f_cp_stu.htm">copy-structure</a></td><td width="70%">cl_object cl_copy_structure(cl_object structure)</td></tr>
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</tbody>
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</table>
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</div>
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</div>
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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="Conditions.html" accesskey="n" rel="next">Conditions</a>, Previous: <a href="Objects.html" accesskey="p" rel="prev">Objects</a>, Up: <a href="Standards.html" accesskey="u" rel="up">Standards</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indexes.html" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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