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<!--Weave of 'Either-Or Properties' 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="../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 Properties</b></li></ul></div>
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<p class="purpose">Properties which can either be present or not, but have no value attached.</p>
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<ul class="toc"><li><a href="3-ep.html#SP1">§1. Pairs and negations</a></li><li><a href="3-ep.html#SP2">§2. Initialising details</a></li><li><a href="3-ep.html#SP3">§3. Requesting new named properties</a></li><li><a href="3-ep.html#SP4">§4. Requesting new nameless properties</a></li><li><a href="3-ep.html#SP5">§5. Dealing with pairs</a></li><li><a href="3-ep.html#SP8">§8. Assertion</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Pairs and negations. </b>Either-or properties may need rather different run-time implementation from
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properties with values, but otherwise they might seem nothing special: why
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not simply regard them as properties holding truth state values? And then
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there would just be one type of property.
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</p>
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<p class="commentary">The answer is that whereas a computer-science view of the "open" property,
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say, would take exactly this line — i.e., that it simply holds a truth
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state, and that the word "closed" is only syntactic sugar for saying that
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this value is false — natural language is different. In natural language,
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the words "open" and "closed" are just as good as each other. One might
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talk equally about "the closed property" as about "the open property".
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</p>
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<p class="commentary">We therefore implement these as two <a href="3-prp.html#SP1" class="internal">property</a> instances, each of the
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either-or type. For each one, <span class="extract"><span class="extract-syntax">negation</span></span> points to the other. We call
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this a "pair". It's not required that either-or properties come in pairs;
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sometimes an author simply says that something "can be P" rather than "can be
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P or Q".
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. Initialising details. </b>Each either-or property has the following small block of data attached:
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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">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">either_or_property_data</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">negation</span><span class="plain-syntax">; </span><span class="comment-syntax"> see above: the other, if it's one of a pair</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">is_default</span><span class="plain-syntax">; </span><span class="comment-syntax"> </span><span class="extract"><span class="extract-syntax">TRUE</span></span><span class="comment-syntax"> if this is a negation and was declared second</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">where_negated</span><span class="plain-syntax">; </span><span class="comment-syntax"> the sentence making these antonyms</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">adjective</span><span class="plain-syntax"> *</span><span class="identifier-syntax">as_adjective</span><span class="plain-syntax">; </span><span class="comment-syntax"> if it is adjectivally used</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">command_grammar</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eo_parsing_grammar</span><span class="plain-syntax">; </span><span class="comment-syntax"> exotic forms used in parsing</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">either_or_property_data</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">either_or_property_data</span><span class="plain-syntax"> *</span><span class="function-syntax">EitherOrProperties::new_eo_data</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">EitherOrProperties::new_eo_data</span></span>:<br/>Properties - <a href="3-prp.html#SP3_3">§3.3</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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">either_or_property_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eod</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">either_or_property_data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eod</span><span class="plain-syntax">-></span><span class="element-syntax">negation</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">eod</span><span class="plain-syntax">-></span><span class="element-syntax">is_default</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">eod</span><span class="plain-syntax">-></span><span class="element-syntax">where_negated</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">eod</span><span class="plain-syntax">-></span><span class="element-syntax">as_adjective</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">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eod</span><span class="plain-syntax">-></span><span class="element-syntax">eo_parsing_grammar</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">endif</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">eod</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>The structure either_or_property_data is accessed in 2/ins, 2/iaa, 3/epa and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. Requesting new named properties. </b>The following is called to find an existing property called <span class="extract"><span class="extract-syntax">W</span></span>, or create
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a new one if necessary, and give the subject <span class="extract"><span class="extract-syntax">subj</span></span> permission to have it:
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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">property</span><span class="plain-syntax"> *</span><span class="function-syntax">EitherOrProperties::obtain</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="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subj</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="function-syntax"><k-kind></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">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_KindAdjectiveClash</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"this tries to create a new either/or adjective with the same name "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"as an existing kind"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"which isn't allowed. For example, 'A hopper can be a container.' is "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"not allowed because something either is, or is not, a 'container', "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"and that can never change during play. 'Container' is a kind, and "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"those are fixed. 'A hopper is a container' would be allowed, because "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"that makes a definite statement."</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">NULL</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="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><a href="3-prp.html#SP2" class="function-link"><span class="function-syntax">Properties::obtain</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</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">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax"> = </span><a href="4-ks.html#SP3" class="function-link"><span class="function-syntax">KindSubjects::to_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">subj</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="3-epa.html#SP2" class="function-link"><span class="function-syntax">EitherOrPropertyAdjectives::create_for_property</span></a><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><span class="identifier-syntax">K</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">prn</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="SP4" class="paragraph-anchor"></a><b>§4. Requesting new nameless properties. </b>These are properties needed for implementation reasons by <a href="../runtime-module/index.html" class="internal">runtime</a>, or by
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features in <a href="../if-module/index.html" class="internal">if</a>, but which have no existence at the Inform 7 source text level —
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and hence have no names. An author cannot refer to them, knows nothing of them.
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</p>
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<p class="commentary">Setting them up as adjectives may seem a little over the top, since they cannot
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be encountered in source text, but the world model will have to set these properties
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by asserting propositions to be true; and type-checking of those propositions
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relies on adjectival meanings.
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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">property</span><span class="plain-syntax"> *</span><span class="function-syntax">EitherOrProperties::new_nameless</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">identifier_text</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">package_request</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Hierarchy::completion_package</span><span class="plain-syntax">(</span><span class="identifier-syntax">PROPERTIES_HAP</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><a href="3-prp.html#SP3" class="function-link"><span class="function-syntax">Properties::create</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><span class="identifier-syntax">identifier_text</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">RTProperties::dont_show_in_index</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><a href="3-epa.html#SP2" class="function-link"><span class="function-syntax">EitherOrPropertyAdjectives::create_for_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</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">Inter_level_only</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">prn</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="SP5" class="paragraph-anchor"></a><b>§5. Dealing with pairs. </b>When created, all properties start out as singletons; the following joins
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two together into a pair. It's allowed to rejoin an existing pair (either way
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around), but not to break one.
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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">EitherOrProperties::make_pair</span><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="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">neg</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">"non-EO property"</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">neg</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">neg</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">"non-EO property"</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><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">EitherOrProperties::get_negation</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><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">EitherOrProperties::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">neg</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><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">EitherOrProperties::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">) != </span><span class="identifier-syntax">neg</span><span class="plain-syntax">) ||</span>
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<span class="plain-syntax"> (</span><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">EitherOrProperties::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">neg</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="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">neg</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><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">EitherOrProperties::get_negation</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="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(5, </span><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">EitherOrProperties::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">neg</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(5, </span><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">EitherOrProperties::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">neg</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(),</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_BrokenNegationPair</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"In %1, you proposed to set up the properties '%2' and '%3' as "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"opposites of each other. But I can't allow that, because '%4' "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"already has an opposite in another context ('%5')."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</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">prn</span><span class="plain-syntax">-></span><span class="element-syntax">either_or_data</span><span class="plain-syntax">-></span><span class="identifier-syntax">is_default</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">neg</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(4, </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">where_negated</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(),</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_TransposedNegationPair</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"In %1, you proposed to set up the properties '%2' and '%3' as "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"opposites of each other. But I can't allow that, because they "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"are already set up as opposites, but the other way around. "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"(This matters because it affects whether things not explicitly "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"said to be either should be %2 or %3. Here you imply %3 is the "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"default, but in the previous declaration %4, %2 was.) Putting these "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"two property names the other way around should fix it."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</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="element-syntax">negation</span><span class="plain-syntax"> = </span><span class="identifier-syntax">neg</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">neg</span><span class="plain-syntax">-></span><span class="element-syntax">either_or_data</span><span class="plain-syntax">-></span><span class="element-syntax">negation</span><span class="plain-syntax"> = </span><span class="identifier-syntax">prn</span><span class="plain-syntax">;</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="element-syntax">is_default</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">neg</span><span class="plain-syntax">-></span><span class="element-syntax">either_or_data</span><span class="plain-syntax">-></span><span class="element-syntax">is_default</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</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="element-syntax">where_negated</span><span class="plain-syntax"> = </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">neg</span><span class="plain-syntax">-></span><span class="element-syntax">either_or_data</span><span class="plain-syntax">-></span><span class="element-syntax">where_negated</span><span class="plain-syntax"> = </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">RTProperties::store_in_negation</span><span class="plain-syntax">(</span><span class="identifier-syntax">neg</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">EitherOrProperties::vet_use_as_non_default_property</span><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="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="reserved-syntax">return</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">prn</span><span class="plain-syntax">-></span><span class="element-syntax">either_or_data</span><span class="plain-syntax">-></span><span class="element-syntax">is_default</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_property</span><span class="plain-syntax">(3, </span><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">EitherOrProperties::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(4, </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">where_negated</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(),</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_TransposedNegationPair2</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"In %1, you proposed to set up the property '%2' as something which "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"is sometimes held and sometimes not, but by default is not. However, "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that clashes with the existing declaration %4, which establishes "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that %2 is the opposite of %3, and is held by default. (The "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"simplest way to fix this is just to change '%2' to '%3' in your "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"sentence here.)"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="function-syntax">EitherOrProperties::get_negation</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">EitherOrProperties::get_negation</span></span>:<br/><a href="3-ep.html#SP5">§5</a><br/>Properties - <a href="3-prp.html#SP14">§14</a>, <a href="3-prp.html#SP15_3">§15.3</a>, <a href="3-prp.html#SP18">§18</a>, <a href="3-prp.html#SP20">§20</a><br/>Property Permissions - <a href="4-pp.html#SP2">§2</a><br/>Property Inferences - <a href="5-pi.html#SP5">§5</a>, <a href="5-pi.html#SP9">§9</a>, <a href="5-pi.html#SP10">§10</a><br/>The Model World - <a href="5-tmw.html#SP4_2">§4.2</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="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="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</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">prn</span><span class="plain-syntax">-></span><span class="element-syntax">either_or_data</span><span class="plain-syntax">-></span><span class="element-syntax">negation</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>Miscellaneous details:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="identifier-syntax">command_grammar</span><span class="plain-syntax"> *</span><span class="function-syntax">EitherOrProperties::get_parsing_grammar</span><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="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="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</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">prn</span><span class="plain-syntax">-></span><span class="element-syntax">either_or_data</span><span class="plain-syntax">-></span><span class="element-syntax">eo_parsing_grammar</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">EitherOrProperties::set_parsing_grammar</span><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">command_grammar</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cg</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">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">"non-EO property"</span><span class="plain-syntax">);</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="element-syntax">eo_parsing_grammar</span><span class="plain-syntax"> = </span><span class="identifier-syntax">cg</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
|
|
|
|
<span class="identifier-syntax">adjective</span><span class="plain-syntax"> *</span><span class="function-syntax">EitherOrProperties::as_adjective</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">EitherOrProperties::as_adjective</span></span>:<br/><a href="3-ep.html#SP8">§8</a><br/>Either-Or Property Adjectives - <a href="3-epa.html#SP2">§2</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="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">"non-EO property"</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">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="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. Assertion. </b></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">EitherOrProperties::assert</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">EitherOrProperties::assert</span></span>:<br/>The Naming Thicket - <a href="5-tnt.html#SP5">§5</a>, <a href="5-tnt.html#SP9_1_4">§9.1.4</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="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner</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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">certainty</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prop</span><span class="plain-syntax"> = </span><span class="identifier-syntax">AdjectivalPredicates::new_atom_on_x</span><span class="plain-syntax">(</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><span class="identifier-syntax">parity</span><span class="plain-syntax">)?</span><span class="identifier-syntax">FALSE:TRUE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="1-ap.html#SP2" class="function-link"><span class="function-syntax">Assert::true_about</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">, </span><span class="identifier-syntax">owner</span><span class="plain-syntax">, </span><span class="identifier-syntax">certainty</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
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|
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