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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.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>Instances as Adjectives</b></li></ul></div>
<p class="purpose">When instances are adjectives as well as nouns.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>Some constant names can be used adjectivally, but not others. This happens
when their kind's name coincides with a name for a property, as might for
instance happen with "colour". In other words, because it is reasonable
that a ball might have a colour, we can declare that "the ball is green",
or speak of "something blue", whereas "number" is not a coinciding property,
and we would not ordinarily write "the ball is 4".<sup id="fnref:1"><a href="#fn:1" rel="footnote">1</a></sup>
</p>
<p class="commentary">These instances make "enumerative adjectives" because they arise from
enumerations such as:
</p>
<blockquote>
<p>The ball can be red, green or blue.</p>
</blockquote>
<ul class="footnotetexts"><li class="footnote" id="fn:1"><p class="inwebfootnote"><sup id="fnref:1"><a href="#fn:1" rel="footnote">1</a></sup> A quirk in English does allow this, implicitly construing number as an
age property, but we don't go there in Inform.
<a href="#fnref:1" title="return to text"> &#x21A9;</a></p></li></ul>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">adjective_meaning_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">enumerative_amf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InstanceAdjectives::start</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">InstanceAdjectives::start</span></span>:<br/>Knowledge Module - <a href="1-km.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">enumerative_amf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">AdjectiveMeanings::new_family</span><span class="plain-syntax">(2);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">enumerative_amf</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSERT_ADJM_MTID</span><span class="plain-syntax">, </span><a href="2-iaa.html#SP3" class="function-link"><span class="function-syntax">InstanceAdjectives::assert</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">InstanceAdjectives::is_enumerative</span><span class="plain-syntax">(</span><span class="identifier-syntax">adjective_meaning</span><span class="plain-syntax"> *</span><span class="identifier-syntax">am</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">am</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">am</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">family</span><span class="plain-syntax"> == </span><span class="identifier-syntax">enumerative_amf</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>Let's reconstruct the chain of events, shall we? It has been found that an
instance, though a noun, must be used as an adjective: for example, "red".
Inform has run through the permissions for the property ("colour") in
question, and found that, say, it's a property of doors, scenes and also
a single piece of litmus paper. Each of these three is an inference subject,
so <a href="4-is.html#SP22" class="internal">InferenceSubjects::make_adj_const_domain</a> was called for each in turn.
</p>
<p class="commentary">By different means, those calls all ended up by passing the buck onto the
following function: twice with the domain <span class="extract"><span class="extract-syntax">set</span></span> being a kind ("door" and then
"scene"), once with <span class="extract"><span class="extract-syntax">set</span></span> being null and <span class="extract"><span class="extract-syntax">singleton</span></span> an instance ("litmus paper").
</p>
<p class="commentary">So, then, we make the instance <span class="extract"><span class="extract-syntax">I</span></span> have an adjectival use setting the property
<span class="extract"><span class="extract-syntax">P</span></span> when applied to either <span class="extract"><span class="extract-syntax">set</span></span> or <span class="extract"><span class="extract-syntax">singleton</span></span>, whichever is not null.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InstanceAdjectives::make_adjectival</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">InstanceAdjectives::make_adjectival</span></span>:<br/>Instance Subjects - <a href="4-is2.html#SP1">&#167;1</a><br/>Kind Subjects - <a href="4-ks.html#SP7">&#167;7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</span><span class="plain-syntax">, </span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">singleton</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-iaa.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Find the kind domain within which the adjective applies</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">adjective_meaning</span><span class="plain-syntax"> *</span><span class="identifier-syntax">am</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-iaa.html#SP2_2" class="named-paragraph-link"><span class="named-paragraph">Create the adjective meaning for this use of the instance</span><span class="named-paragraph-number">2.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-iaa.html#SP2_3" class="named-paragraph-link"><span class="named-paragraph">Write I6 schemas for asserting and testing this use of the instance</span><span class="named-paragraph-number">2.3</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2_1" class="paragraph-anchor"></a><b>&#167;2.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Find the kind domain within which the adjective applies</span><span class="named-paragraph-number">2.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">singleton</span><span class="plain-syntax">) </span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><a href="2-ins.html#SP10" class="function-link"><span class="function-syntax">Instances::to_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">singleton</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">set</span><span class="plain-syntax">) </span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">set</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">D</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"No adjectival constant domain"</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-iaa.html#SP2">&#167;2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP2_2" class="paragraph-anchor"></a><b>&#167;2.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Create the adjective meaning for this use of the instance</span><span class="named-paragraph-number">2.2</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">NW</span><span class="plain-syntax"> = </span><a href="2-ins.html#SP5" class="function-link"><span class="function-syntax">Instances::get_name</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">adjective</span><span class="plain-syntax"> *</span><span class="identifier-syntax">adj</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Adjectives::declare</span><span class="plain-syntax">(</span><span class="identifier-syntax">NW</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">am</span><span class="plain-syntax"> = </span><span class="identifier-syntax">AdjectiveMeanings::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">enumerative_amf</span><span class="plain-syntax">, </span><span class="identifier-syntax">STORE_POINTER_instance</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">), </span><span class="identifier-syntax">NW</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_adjective</span><span class="plain-syntax"> = </span><span class="identifier-syntax">AdjectiveAmbiguity::add_meaning_to_adjective</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">, </span><span class="identifier-syntax">adj</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">singleton</span><span class="plain-syntax">) </span><span class="identifier-syntax">AdjectiveMeaningDomains::set_from_instance</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">, </span><span class="identifier-syntax">singleton</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">set</span><span class="plain-syntax">) </span><span class="identifier-syntax">AdjectiveMeaningDomains::set_from_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">, </span><span class="identifier-syntax">set</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-iaa.html#SP2">&#167;2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP2_3" class="paragraph-anchor"></a><b>&#167;2.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Write I6 schemas for asserting and testing this use of the instance</span><span class="named-paragraph-number">2.3</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="identifier-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax"> = </span><span class="identifier-syntax">AdjectiveMeanings::make_schema</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">, </span><span class="identifier-syntax">TEST_ATOM_TASK</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"%k &gt;&gt; *1 . %n == %d"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="identifier-syntax">RTProperties::iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">), </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">enumeration_index</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax"> = </span><span class="identifier-syntax">AdjectiveMeanings::make_schema</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">, </span><span class="identifier-syntax">NOW_ATOM_TRUE_TASK</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"WriteGProperty(%k, *1, %n, %d)"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="identifier-syntax">RTProperties::iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">), </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">enumeration_index</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-iaa.html#SP2">&#167;2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>Asserting such an adjective simply asserts that the property has this value:
for example, asserting "green" on X is saying that the value of the "colour"
property of X is "green".
</p>
<p class="commentary">We refuse to assert the falseness of such an adjective since it's unclear what
to infer from, e.g., "the ball is not green": is it red, or blue?
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">InstanceAdjectives::assert</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">InstanceAdjectives::assert</span></span>:<br/><a href="2-iaa.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">adjective_meaning_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="identifier-syntax">adjective_meaning</span><span class="plain-syntax"> *</span><span class="identifier-syntax">am</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs_to_assert_on</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">parity</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">parity</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_instance</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">family_specific_data</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="3-prp.html#SP19" class="function-link"><span class="function-syntax">Properties::property_with_same_name_as</span></a><span class="plain-syntax">(</span><a href="2-ins.html#SP10" class="function-link"><span class="function-syntax">Instances::to_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"enumerative adjective on non-property"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="5-pi.html#SP3" class="function-link"><span class="function-syntax">PropertyInferences::draw</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs_to_assert_on</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">Rvalues::from_instance</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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