73 lines
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73 lines
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<title>Slot-Value - SBCL Internals</title>
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Next: <a rel="next" accesskey="n" href="Specials.html#Specials">Specials</a>,
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<h2 class="chapter">7 Slot-Value</h2>
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<p><a name="index-slot_002dvalue-4"></a><a name="index-g_t_0028setf-slot_002dvalue_0029-5"></a><a name="index-slot_002dboundp-6"></a><a name="index-slot_002dmakunbound-7"></a><a name="index-slot_002dvalue_002dusing_002dclass-8"></a><a name="index-g_t_0028setf-slot_002dvalue_002dusing_002dclass_0029-9"></a><a name="index-slot_002dboundp_002dusing_002dclass-10"></a><a name="index-slot_002dmakunbound_002dusing_002dclass-11"></a>
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<li><a accesskey="1" href="Basic-Implementation.html#Basic-Implementation">Basic Implementation</a>
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<li><a accesskey="2" href="Compiler-Transformations.html#Compiler-Transformations">Compiler Transformations</a>
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<li><a accesskey="3" href="MOP-Optimizations.html#MOP-Optimizations">MOP Optimizations</a>
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</ul>
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<p>The ANSI Common Lisp standard specifies <code>slot-value</code>, <code>(setf
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slot-value)</code>, <code>slot-boundp</code> and <code>slot-makunbound</code> for
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standard-objects, and furthermore suggests that these be implemented in
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terms of Metaobject generic functions <code>slot-value-using-class</code>,
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<code>(setf slot-value-using-class)</code>, <code>slot-boundp-using-class</code> and
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<code>slot-makunbound-using-class</code>. To make performance of these
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operators tolerable, a number of optimizations are performed, at both
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compile-time and run-time<a rel="footnote" href="Slot_002dValue.html#fn-1" name="fnd-1"><sup>1</sup></a>.
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<h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="Slot_002dValue.html#fnd-1">1</a>]</small> Note that ,at present,
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<code>slot-makunbound</code> and <code>slot-makunbound-using-class</code> are not
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optimized in any of the ways mentioned below.</p>
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