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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#16">Chapter 16: Inference and Model</a></li><li><b>Knowledge about Relations</b></li></ul></div>
<p class="purpose">To store inferences about the state of relationships.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">KnowledgeAboutRelations::SUBJ_get_name_text</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">KnowledgeAboutRelations::SUBJ_get_name_text</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP23">&#167;23</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</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">EMPTY_WORDING</span><span class="plain-syntax">; </span><span class="comment-syntax"> nameless</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">general_pointer</span><span class="plain-syntax"> </span><span class="function-syntax">KnowledgeAboutRelations::SUBJ_new_permission_granted</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">KnowledgeAboutRelations::SUBJ_new_permission_granted</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP24">&#167;24</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</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">NULL_GENERAL_POINTER</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">KnowledgeAboutRelations::SUBJ_make_adj_const_domain</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">KnowledgeAboutRelations::SUBJ_make_adj_const_domain</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP25">&#167;25</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</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">nc</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">void</span><span class="plain-syntax"> </span><span class="function-syntax">KnowledgeAboutRelations::SUBJ_complete_model</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">KnowledgeAboutRelations::SUBJ_complete_model</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP26">&#167;26</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">domain_size</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NUMBER_CREATED</span><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax"> = </span><a href="16-is.html#SP18" class="function-link"><span class="function-syntax">InferenceSubjects::as_bp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</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">BinaryPredicates::store_dynamically</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax">; </span><span class="comment-syntax"> handled at run-time instead</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">BinaryPredicates::get_form_of_relation</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">) == </span><span class="identifier-syntax">Relation_Equiv</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">right_way_round</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><a href="7-rlt.html#SP18" class="function-link"><span class="function-syntax">Relations::equivalence_relation_make_singleton_partitions</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">domain_size</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">POSITIVE_KNOWLEDGE_LOOP</span><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">BinaryPredicates::as_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">), </span><span class="constant-syntax">ARBITRARY_RELATION_INF</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">infs0</span><span class="plain-syntax">, *</span><span class="identifier-syntax">infs1</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="16-in.html#SP11" class="function-link"><span class="function-syntax">World::Inferences::get_references</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">infs0</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">infs1</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="7-rlt.html#SP19" class="function-link"><span class="function-syntax">Relations::equivalence_relation_merge_classes</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">domain_size</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">infs0</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">allocation_id</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs1</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">allocation_id</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><a href="7-rlt.html#SP20" class="function-link"><span class="function-syntax">Relations::equivalence_relation_add_properties</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">);</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">KnowledgeAboutRelations::SUBJ_check_model</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">KnowledgeAboutRelations::SUBJ_check_model</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP27">&#167;27</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax"> = </span><a href="16-is.html#SP18" class="function-link"><span class="function-syntax">InferenceSubjects::as_bp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</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">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">right_way_round</span><span class="plain-syntax">) &amp;&amp;</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">form_of_relation</span><span class="plain-syntax"> == </span><span class="identifier-syntax">Relation_OtoO</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">form_of_relation</span><span class="plain-syntax"> == </span><span class="identifier-syntax">Relation_Sym_OtoO</span><span class="plain-syntax">)))</span>
<span class="plain-syntax"> </span><a href="7-rlt.html#SP22" class="function-link"><span class="function-syntax">Relations::check_OtoO_relation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</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">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">right_way_round</span><span class="plain-syntax">) &amp;&amp;</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">form_of_relation</span><span class="plain-syntax"> == </span><span class="identifier-syntax">Relation_OtoV</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">form_of_relation</span><span class="plain-syntax"> == </span><span class="identifier-syntax">Relation_VtoO</span><span class="plain-syntax">)))</span>
<span class="plain-syntax"> </span><a href="7-rlt.html#SP22" class="function-link"><span class="function-syntax">Relations::check_OtoV_relation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><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">KnowledgeAboutRelations::SUBJ_emit_element_of_condition</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">KnowledgeAboutRelations::SUBJ_emit_element_of_condition</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP28">&#167;28</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">t0_s</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"BP in runtime match condition"</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>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">KnowledgeAboutRelations::SUBJ_compile_all</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">KnowledgeAboutRelations::SUBJ_compile_all</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP29">&#167;29</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="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">void</span><span class="plain-syntax"> </span><span class="function-syntax">KnowledgeAboutRelations::SUBJ_compile</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">KnowledgeAboutRelations::SUBJ_compile</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP29">&#167;29</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax"> = </span><a href="16-is.html#SP18" class="function-link"><span class="function-syntax">InferenceSubjects::as_bp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</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">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">right_way_round</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">BinaryPredicates::store_dynamically</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> = </span><a href="26-rt.html#SP1" class="function-link"><span class="function-syntax">Routines::begin</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">initialiser_iname</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">rtiname</span><span class="plain-syntax"> = </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">RELATIONTEST_HL</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">POSITIVE_KNOWLEDGE_LOOP</span><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">BinaryPredicates::as_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">), </span><span class="constant-syntax">ARBITRARY_RELATION_INF</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec0</span><span class="plain-syntax">, *</span><span class="identifier-syntax">spec1</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="16-in.html#SP11" class="function-link"><span class="function-syntax">World::Inferences::get_references_spec</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">spec0</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">spec1</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">BinaryPredicates::mark_as_needed</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::inv_call_iname</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">rtiname</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val_iname</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">bp_iname</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val_iname</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">RELS_ASSERT_TRUE_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="14-cfs.html#SP8" class="function-link"><span class="function-syntax">Specifications::Compiler::emit_as_val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">spec0</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="14-cfs.html#SP8" class="function-link"><span class="function-syntax">Specifications::Compiler::emit_as_val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">spec1</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::up</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><a href="26-rt.html#SP4" class="function-link"><span class="function-syntax">Routines::end</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">save</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="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">form_of_relation</span><span class="plain-syntax"> == </span><span class="identifier-syntax">Relation_VtoV</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">form_of_relation</span><span class="plain-syntax"> == </span><span class="identifier-syntax">Relation_Sym_VtoV</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><a href="7-rlt.html#SP14" class="function-link"><span class="function-syntax">Relations::compile_vtov_storage</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
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