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<!--Weave of 'The Provision Relation' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#15">Chapter 15: Properties</a></li><li><b>The Provision Relation</b></li></ul></div>
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<p class="purpose">To define the provision relation, which determines which properties can be held by which objects.</p>
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<ul class="toc"><li><a href="15-tpr.html#SP2">§2. Initial stock</a></li><li><a href="15-tpr.html#SP3">§3. Second stock</a></li><li><a href="15-tpr.html#SP4">§4. Typechecking</a></li><li><a href="15-tpr.html#SP5">§5. Assertion</a></li><li><a href="15-tpr.html#SP6">§6. Compilation</a></li><li><a href="15-tpr.html#SP7">§7. Problem message text</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>As we've seen, assertions assigning properties ("A scene has a time called
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the expected duration") result in properties being created — here "expected
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duration" — and then in suitable propositions being asserted as true.
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</p>
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<p class="commentary">These propositions are written in terms of the provision predicate: for
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example, provision(scene, expected duration). This is the only way to
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grant permission to hold a property within the world model.
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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">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R_provision</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><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. Initial stock. </b>There's just one relation of this kind, and it's hard-wired in.
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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">Properties::ProvisionRelation::REL_create_initial_stock</span><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">R_provision</span><span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">BinaryPredicates::make_pair</span><span class="plain-syntax">(</span><span class="identifier-syntax">PROVISION_KBP</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">BinaryPredicates::new_term</span><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">), </span><span class="identifier-syntax">BinaryPredicates::new_term</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">I</span><span class="string-syntax">"provides"</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</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">PreformUtilities::wording</span><span class="plain-syntax">(</span><span class="function-syntax"><relation-names></span><span class="plain-syntax">, </span><span class="constant-syntax">PROVISION_RELATION_NAME</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">BinaryPredicates::set_index_details</span><span class="plain-syntax">(</span><span class="identifier-syntax">R_provision</span><span class="plain-syntax">, </span><span class="string-syntax">"value"</span><span class="plain-syntax">, </span><span class="string-syntax">"property"</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. Second stock. </b>There is none, of course.
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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">Properties::ProvisionRelation::REL_create_second_stock</span><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>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Typechecking. </b>Any property can in principle be assigned to any inference subject (as we'll
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see in the next chapter), so there's really no restriction on the left term.
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The right term, of course, has to be a property.
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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">Properties::ProvisionRelation::REL_typecheck</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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> **</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> **</span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">, </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</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">Kinds::get_construct</span><span class="plain-syntax">(</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1]) == </span><span class="identifier-syntax">CON_property</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ALWAYS_MATCH</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="2-sq.html#SP3" class="function-link"><span class="function-syntax">Problems::quote_kind</span></a><span class="plain-syntax">(4, </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1]);</span>
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<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_BadProvides</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"that asks whether something provides something, and in Inform 'to provide' "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"means that an object (or value) has a property attached - for instance, "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"containers provide the property 'carrying capacity'. Here, though, we have "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"%4 rather than the name of a property."</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">NEVER_MATCH</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. Assertion. </b>If we assert that, say, vehicles provide "colour", then we are implicitly
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enabling adjectives like "green" or "blue" to apply to vehicles, so we
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must make sure any such meanings are defined.
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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">Properties::ProvisionRelation::REL_assert</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>
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<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">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec0</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs1</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec1</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="14-rv.html#SP2" class="function-link"><span class="function-syntax">Rvalues::to_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec1</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">infs0</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="16-pp.html#SP8" class="function-link"><span class="function-syntax">World::Permissions::grant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs0</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</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><a href="6-ins.html#SP9" class="function-link"><span class="function-syntax">Instances::update_adjectival_forms</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">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="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="SP6" class="paragraph-anchor"></a><b>§6. Compilation. </b>Run-time is too late to change which objects provide what, so this relation
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can't be changed at compile time.
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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">Properties::ProvisionRelation::REL_compile</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">task</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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">annotated_i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">asch</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">task</span><span class="plain-syntax"> == </span><span class="constant-syntax">TEST_ATOM_TASK</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="12-cad.html#SP6" class="function-link"><span class="function-syntax">Calculus::Deferrals::Cinders::kind_of_value_of_term</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="element-syntax">pt0</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="14-rv.html#SP2" class="function-link"><span class="function-syntax">Rvalues::to_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="element-syntax">pt1</span><span class="plain-syntax">.</span><span class="identifier-syntax">constant</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">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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Behaviour::is_object</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="named-paragraph-container code-font"><a href="15-tpr.html#SP6_1" class="named-paragraph-link"><span class="named-paragraph">Compile an I6 run-time test of property provision</span><span class="named-paragraph-number">6.1</span></a></span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="15-tpr.html#SP6_2" class="named-paragraph-link"><span class="named-paragraph">Determine the result now, since we know already, and compile only the outcome</span><span class="named-paragraph-number">6.2</span></a></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><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Behaviour::is_object</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="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">PK</span><span class="plain-syntax"> = </span><a href="12-cad.html#SP6" class="function-link"><span class="function-syntax">Calculus::Deferrals::Cinders::kind_of_value_of_term</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="element-syntax">pt1</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">Kinds::get_construct</span><span class="plain-syntax">(</span><span class="identifier-syntax">PK</span><span class="plain-syntax">) == </span><span class="identifier-syntax">CON_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">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">K_truth_state</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::unary_construction_material</span><span class="plain-syntax">(</span><span class="identifier-syntax">PK</span><span class="plain-syntax">)))</span>
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<span class="plain-syntax"> </span><a href="12-is.html#SP3_1" class="function-link"><span class="function-syntax">Calculus::Schemas::modify</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="element-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"WhetherProvides(*1, true, *2)"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><a href="12-is.html#SP3_1" class="function-link"><span class="function-syntax">Calculus::Schemas::modify</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="element-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"WhetherProvides(*1, false, *2)"</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="plain-syntax"> }</span>
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<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">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="SP6_1" class="paragraph-anchor"></a><b>§6.1. </b>Since type-checking for "object" is too weak to make it certain what kind
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of object the left operand is, we can only test property provision at run-time:
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compile an I6 run-time test of property provision</span><span class="named-paragraph-number">6.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="15-pr.html#SP15" class="function-link"><span class="function-syntax">Properties::is_value_property</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="12-is.html#SP3_1" class="function-link"><span class="function-syntax">Calculus::Schemas::modify</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="element-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"WhetherProvides(*1, false, *2)"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><a href="12-is.html#SP3_1" class="function-link"><span class="function-syntax">Calculus::Schemas::modify</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="element-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"WhetherProvides(*1, true, *2)"</span><span class="plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="15-tpr.html#SP6">§6</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP6_2" class="paragraph-anchor"></a><b>§6.2. </b>For all other kinds, type-checking is strong enough that we can prove the
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answer now.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Determine the result now, since we know already, and compile only the outcome</span><span class="named-paragraph-number">6.2</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="16-pp.html#SP7" class="function-link"><span class="function-syntax">World::Permissions::find</span></a><span class="plain-syntax">(</span><a href="13-kak.html#SP1" class="function-link"><span class="function-syntax">Kinds::Knowledge::as_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">), </span><span class="identifier-syntax">prn</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><a href="12-is.html#SP3_1" class="function-link"><span class="function-syntax">Calculus::Schemas::modify</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="element-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"true"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><a href="12-is.html#SP3_1" class="function-link"><span class="function-syntax">Calculus::Schemas::modify</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="element-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"false"</span><span class="plain-syntax">);</span>
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</pre>
|
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<ul class="endnotetexts"><li>This code is used in <a href="15-tpr.html#SP6">§6</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. Problem message text. </b>Nothing special is needed here.
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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">Properties::ProvisionRelation::REL_describe_for_problems</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</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>
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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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