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<!--Weave of 'Either-Or Property Adjectives' generated by Inweb-->
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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#3">Chapter 3: Properties</a></li><li><b>Either-Or Property Adjectives</b></li></ul></div>
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<p class="purpose">Names of either-or properties when used as adjectives.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Names of either-or properties can be used adjectivally in Inform: thus,
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"an open door", or "a transparent container". They form the <span class="extract"><span class="extract-syntax">either_or_property_amf</span></span>
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family of adjectives, which we now declare.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">adjective_meaning_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">either_or_property_amf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">EitherOrPropertyAdjectives::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">EitherOrPropertyAdjectives::start</span></span>:<br/>Knowledge Module - <a href="1-km.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">either_or_property_amf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">AdjectiveMeanings::new_family</span><span class="plain-syntax">(1);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">either_or_property_amf</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSERT_ADJM_MTID</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><a href="3-epa.html#SP3" class="function-link"><span class="function-syntax">EitherOrPropertyAdjectives::assert</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">either_or_property_amf</span><span class="plain-syntax">, </span><span class="identifier-syntax">PREPARE_SCHEMAS_ADJM_MTID</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><a href="3-epa.html#SP3" class="function-link"><span class="function-syntax">EitherOrPropertyAdjectives::prepare_schemas</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">either_or_property_amf</span><span class="plain-syntax">, </span><span class="identifier-syntax">INDEX_ADJM_MTID</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><a href="3-epa.html#SP3" class="function-link"><span class="function-syntax">EitherOrPropertyAdjectives::index</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">EitherOrPropertyAdjectives::is</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>
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<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">) && (</span><span class="identifier-syntax">am</span><span class="plain-syntax">-></span><span class="element-syntax">family</span><span class="plain-syntax"> == </span><span class="identifier-syntax">either_or_property_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>
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<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>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>This tells us that the property should now be used adjectivally over a given
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kind. Note that it creates the adjective if it doesn't already exist, and also
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that it does nothing if the adjective can already be used in this way. So, for
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example, the either-or property "empty" has an associated adjective "empty",
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but it can apply to both rulebooks and containers. These are two different
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adjective meanings, one for each kind the adjective applies to.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">EitherOrPropertyAdjectives::create_for_property</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">EitherOrPropertyAdjectives::create_for_property</span></span>:<br/>Either-Or Properties - <a href="3-ep.html#SP3">§3</a>, <a href="3-ep.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">prn</span><span class="plain-syntax">-></span><span class="element-syntax">either_or_data</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">"not either-or"</span><span class="plain-syntax">);</span>
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<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><a href="3-ep.html#SP7" class="function-link"><span class="function-syntax">EitherOrProperties::as_adjective</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">adj</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">AdjectiveAmbiguity::can_be_applied_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">adj</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<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">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">prn</span><span class="plain-syntax">-></span><span class="element-syntax">either_or_data</span><span class="plain-syntax">-></span><span class="element-syntax">as_adjective</span><span class="plain-syntax"> = </span><span class="identifier-syntax">adj</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">AdjectiveMeanings::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">either_or_property_amf</span><span class="plain-syntax">, </span><span class="identifier-syntax">STORE_POINTER_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">), </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<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>
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<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">K</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>That just leaves three methods, all of which pass out work elsewhere:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">EitherOrPropertyAdjectives::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">EitherOrPropertyAdjectives::assert</span></span>:<br/><a href="3-epa.html#SP1">§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>
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<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="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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">-></span><span class="identifier-syntax">family_specific_data</span><span class="plain-syntax">);</span>
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<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><a href="5-pi.html#SP3" class="function-link"><span class="function-syntax">PropertyInferences::draw_negated</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">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</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">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
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<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>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">EitherOrPropertyAdjectives::prepare_schemas</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">EitherOrPropertyAdjectives::prepare_schemas</span></span>:<br/><a href="3-epa.html#SP1">§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">family</span><span class="plain-syntax">,</span>
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<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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">T</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">-></span><span class="identifier-syntax">family_specific_data</span><span class="plain-syntax">);</span>
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<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">-></span><span class="identifier-syntax">schemas_prepared</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">RTProperties::write_either_or_schemas</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">T</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">EitherOrPropertyAdjectives::index</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">EitherOrPropertyAdjectives::index</span></span>:<br/><a href="3-epa.html#SP1">§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">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">,</span>
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<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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">am</span><span class="plain-syntax">-></span><span class="identifier-syntax">family_specific_data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">RTInferences::index_either_or</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
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<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>
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<span class="plain-syntax">}</span>
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