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<!--Weave of 'Preform for Instances' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">knowledge</a></li><li><a href="index.html#2">Chapter 2: Instances and Variables</a></li><li><b>Preform for Instances</b></li></ul></div>
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<p class="purpose">To manage constant values of enumerated kinds or kinds of object.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>The first internal matches only instances of kinds within the objects;
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the second matches the others; and the third all instances, of whatever kind.
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Note that the return pointer from these nonterminals is to <span class="extract"><span class="extract-syntax">instance</span></span>, not
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to a <span class="extract"><span class="extract-syntax">parse_node</span></span> holding a specification, as with the S-parser.
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</p>
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<pre class="Preform-displayed-code all-displayed-code code-font">
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<span class="Preform-function-syntax"><instance-of-object></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Articles::remove_the</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">);</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-function-syntax"><s-object-instance></span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">)) {</span>
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<span class="Preform-plain-syntax"> ==> { -, </span><span class="Preform-identifier-syntax">Rvalues::to_instance</span><span class="Preform-plain-syntax">(</span><span class="Preform-function-syntax"><<rp>></span><span class="Preform-plain-syntax">) };</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">;</span>
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<span class="Preform-plain-syntax"> }</span>
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<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> };</span>
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<span class="Preform-plain-syntax">}</span>
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<span class="Preform-function-syntax"><instance-of-non-object></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Articles::remove_the</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">);</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">parse_node</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexicon::retrieve</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">NAMED_CONSTANT_MC</span><span class="Preform-plain-syntax">, </span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">);</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">instance</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">I</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Rvalues::to_instance</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">);</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> (</span><span class="Preform-identifier-syntax">I</span><span class="Preform-plain-syntax">) {</span>
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<span class="Preform-plain-syntax"> ==> { -, </span><span class="Preform-identifier-syntax">I</span><span class="Preform-plain-syntax"> }; </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">;</span>
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<span class="Preform-plain-syntax"> }</span>
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<span class="Preform-plain-syntax"> ==> { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> };</span>
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<span class="Preform-plain-syntax">}</span>
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<span class="Preform-function-syntax"><instance></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><instance-of-object></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { pass 1 }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><instance-of-non-object></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { pass 1 }</span>
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</pre>
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<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
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