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<!--Weave of 'Instance Counting' 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#16">Chapter 16: Inference and Model</a></li><li><b>Instance Counting</b></li></ul></div>
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<p class="purpose">A plugin which maintains run-time-accessible linked lists of instances of kinds, in order to speed up loops; and instance counts within kinds, in order to speed up relation storage; and the object-kind hierarchy, in order to speed up run-time checking of the type safety of property usage.</p>
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<ul class="toc"><li><a href="16-ic.html#SP3">§3. Plugin startup</a></li><li><a href="16-ic.html#SP4">§4. Initialising</a></li><li><a href="16-ic.html#SP5">§5. Computing instance counts</a></li><li><a href="16-ic.html#SP7">§7. Instance sequences</a></li><li><a href="16-ic.html#SP9">§9. Inform 6 representation</a></li><li><a href="16-ic.html#SP13">§13. Memory estimation</a></li><li><a href="16-ic.html#SP14">§14. Loop optimisation</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Every subject contains a pointer to its own unique copy of the following
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structure, but it only has relevance if the subject represents an object:
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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">counting_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">instance_count_prop</span><span class="plain-syntax">; </span><span class="comment-syntax"> the (</span><span class="extract"><span class="extract-syntax">I6</span></span><span class="comment-syntax"> only) IK-Count property for this kind</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">instance_link_prop</span><span class="plain-syntax">; </span><span class="comment-syntax"> the (</span><span class="extract"><span class="extract-syntax">I6</span></span><span class="comment-syntax"> only) IK-Link property for this kind</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">has_instances</span><span class="plain-syntax">; </span><span class="comment-syntax"> are there any instances of this kind?</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">counting_data</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure counting_data is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>In addition to these I6 properties, two for each kind, there's a single
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additional property called <span class="extract"><span class="extract-syntax">vector</span></span> which is needed as run-time storage for
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route-finding through relations on objects.
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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="identifier-syntax">P_vector</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P_KD_Count</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="comment-syntax"> see below</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. Plugin startup. </b></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">PL::Counting::start</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">PL::Counting::start</span></span>:<br/>Plugins - <a href="26-pl.html#SP8">§8</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PLUGIN_REGISTER</span><span class="plain-syntax">(</span><span class="constant-syntax">PLUGIN_NEW_SUBJECT_NOTIFY</span><span class="plain-syntax">, </span><a href="16-ic.html#SP4" class="function-link"><span class="function-syntax">PL::Counting::counting_new_subject_notify</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PLUGIN_REGISTER</span><span class="plain-syntax">(</span><span class="constant-syntax">PLUGIN_COMPLETE_MODEL</span><span class="plain-syntax">, </span><a href="16-ic.html#SP11" class="function-link"><span class="function-syntax">PL::Counting::counting_complete_model</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PLUGIN_REGISTER</span><span class="plain-syntax">(</span><span class="constant-syntax">PLUGIN_COMPILE_MODEL_TABLES</span><span class="plain-syntax">, </span><a href="16-ic.html#SP9" class="function-link"><span class="function-syntax">PL::Counting::counting_compile_model_tables</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PLUGIN_REGISTER</span><span class="plain-syntax">(</span><span class="constant-syntax">PLUGIN_ESTIMATE_PROPERTY_USAGE</span><span class="plain-syntax">, </span><a href="16-ic.html#SP13" class="function-link"><span class="function-syntax">PL::Counting::counting_estimate_property_usage</span></a><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. Initialising. </b>Counting data is actually relevant only for kinds, and remains blank for instances.
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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">PL::Counting::counting_new_subject_notify</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">PL::Counting::counting_new_subject_notify</span></span>:<br/><a href="16-ic.html#SP3">§3</a></span></button><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="identifier-syntax">CREATE_PF_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">counting</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">, </span><a href="16-ic.html#SP4" class="function-link"><span class="function-syntax">PL::Counting::new_data</span></a><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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<span class="reserved-syntax">counting_data</span><span class="plain-syntax"> *</span><span class="function-syntax">PL::Counting::new_data</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">counting_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cd</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">counting_data</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">cd</span><span class="plain-syntax">-></span><span class="element-syntax">instance_count_prop</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">cd</span><span class="plain-syntax">-></span><span class="element-syntax">instance_link_prop</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">cd</span><span class="plain-syntax">-></span><span class="element-syntax">has_instances</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="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">cd</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. Computing instance counts. </b>We're going to store these temporarily in an array which must be allocated
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dynamically in memory, and this will make lookups quite fiddly, so we
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use the following macro to specify the integer lvalue for the instance
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count of instance <span class="extract"><span class="extract-syntax">I</span></span> within kind <span class="extract"><span class="extract-syntax">k</span></span>. This depends on both: for example,
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the red car might be thing number 17 but vehicle number 2, and will be
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door number \(-1\), since it isn't a door. The first instance in a kind is
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numbered 0.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">INSTANCE_COUNT</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</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_instance_counts</span><span class="plain-syntax">[(</span><span class="identifier-syntax">I</span><span class="plain-syntax">)-></span><span class="identifier-syntax">allocation_id</span><span class="plain-syntax">*</span><span class="identifier-syntax">max_kind_instance_count</span><span class="plain-syntax"> +</span>
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<span class="plain-syntax"> </span><a href="13-rsfk.html#SP3" class="function-link"><span class="function-syntax">Kinds::RunTime::I6_classnumber</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">)]</span>
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</pre>
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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="identifier-syntax">kind_instance_counts</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">max_kind_instance_count</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">PL::Counting::make_instance_counts</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">PL::Counting::make_instance_counts</span></span>:<br/><a href="16-ic.html#SP11">§11</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="16-ic.html#SP5_1" class="named-paragraph-link"><span class="named-paragraph">Allocate the instance count array in memory</span><span class="named-paragraph-number">5.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="16-ic.html#SP5_2" class="named-paragraph-link"><span class="named-paragraph">Compute the instance count array</span><span class="named-paragraph-number">5.2</span></a></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_1" class="paragraph-anchor"></a><b>§5.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Allocate the instance count array in memory</span><span class="named-paragraph-number">5.1</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="identifier-syntax">max_kind_instance_count</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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind_instance_counts</span><span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Memory::calloc</span><span class="plain-syntax">(</span><span class="identifier-syntax">max_kind_instance_count</span><span class="plain-syntax">*</span><span class="identifier-syntax">max_kind_instance_count</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">INSTANCE_COUNTING_MREASON</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="16-ic.html#SP5">§5</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP5_2" class="paragraph-anchor"></a><b>§5.2. </b>The following is quadratic in the number of objects, but this has never been
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a problem in practice; the number seldom exceeds a few hundred.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compute the instance count array</span><span class="named-paragraph-number">5.2</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">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_BASE_KINDS</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">Kinds::Behaviour::is_subkind_of_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">LOOP_OVER_OBJECT_INSTANCES</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">INSTANCE_COUNT</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">) = -1;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_BASE_KINDS</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">Kinds::Behaviour::is_subkind_of_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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ix_count</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_INSTANCES</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</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">INSTANCE_COUNT</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">) = </span><span class="identifier-syntax">ix_count</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>This code is used in <a href="16-ic.html#SP5">§5</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>Instance counts are actually useful to several other plugins, so we provide:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">PL::Counting::instance_count</span><span class="plain-syntax">(</span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</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">kind_instance_counts</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">"instance counts not available"</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">K</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">"instance counts available only for objects"</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">INSTANCE_COUNT</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</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. Instance sequences. </b>At run-time we're going to want to loop through objects in order of their
|
|
definition in the I6 code, which is not the same as their creation order in I7.
|
|
(This is so that an optimised and an unoptimised loop to perform the same
|
|
search will not only iterate through the same set of objects, but in the
|
|
same order.)
|
|
</p>
|
|
|
|
<p class="commentary">The following abstracts the linked list in compilation sequence. Note that
|
|
it excludes instances which have been "diverted", which is mainly used
|
|
to get rid of the <span class="extract"><span class="extract-syntax">selfobj</span></span> object in cases where the source text creates
|
|
an explicit player.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="function-syntax">PL::Counting::next_instance_of</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">PL::Counting::next_instance_of</span></span>:<br/><a href="16-ic.html#SP8">§8</a>, <a href="16-ic.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">k</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">k</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">resuming</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">I</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) { </span><span class="identifier-syntax">I</span><span class="plain-syntax"> = </span><span class="constant-syntax">FIRST_IN_COMPILATION_SEQUENCE</span><span class="plain-syntax">; </span><span class="identifier-syntax">resuming</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">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">I</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">resuming</span><span class="plain-syntax">) </span><span class="identifier-syntax">I</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEXT_IN_COMPILATION_SEQUENCE</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">resuming</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">I</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="16-is.html#SP11" class="function-link"><span class="function-syntax">InferenceSubjects::aliased_but_diverted</span></a><span class="plain-syntax">(</span><a href="6-ins.html#SP12" class="function-link"><span class="function-syntax">Instances::as_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">)))</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">continue</span><span class="plain-syntax">; </span><span class="comment-syntax"> </span><span class="extract"><span class="extract-syntax">selfobj</span></span><span class="comment-syntax"> may not count</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="6-ins.html#SP17" class="function-link"><span class="function-syntax">Instances::of_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">k</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">I</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="identifier-syntax">NULL</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. </b>For compilation purposes, it's useful to express this as a specification:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">PL::Counting::next_instance_of_as_value</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">PL::Counting::next_instance_of_as_value</span></span>:<br/><a href="16-ic.html#SP11_3_3">§11.3.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">k</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">next</span><span class="plain-syntax"> = </span><a href="16-ic.html#SP7" class="function-link"><span class="function-syntax">PL::Counting::next_instance_of</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">k</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">next</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="14-rv.html#SP3" class="function-link"><span class="function-syntax">Rvalues::from_instance</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">next</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="14-rv.html#SP5" class="function-link"><span class="function-syntax">Rvalues::new_nothing_object_constant</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. Inform 6 representation. </b>The main purpose of this plugin is to trade memory for speed at run-time.
|
|
Inform source text is rich in implied searches through kinds ("if a red
|
|
door is open, ...") and we need these to be as fast as possible; iterating
|
|
through all objects would be dangerously slow, so we need a way at run-time
|
|
to iterate through the instances of a single kind (in this example, doors).
|
|
</p>
|
|
|
|
<p class="commentary">For each kind we will store a linked list of instances. The first instance
|
|
need only be defined as a constant, and need not be stored in a memory word,
|
|
since Inform always compiles code which knows which kind it's looping over.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">PL::Counting::first_instance</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">PL::Counting::first_instance</span></span>:<br/><a href="16-ic.html#SP14">§14</a></span></button><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>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind_constructor</span><span class="plain-syntax"> *</span><span class="identifier-syntax">con</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Kinds::get_construct</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">iname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Kinds::Constructors::first_instance_iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">con</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">iname</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::derive_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">FIRST_INSTANCE_HL</span><span class="plain-syntax">, </span><a href="13-rsfk.html#SP24" class="function-link"><span class="function-syntax">Kinds::RunTime::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">), </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Kinds::Constructors::set_first_instance_iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">con</span><span class="plain-syntax">, </span><span class="identifier-syntax">iname</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="identifier-syntax">iname</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="function-syntax">PL::Counting::next_instance</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">PL::Counting::next_instance</span></span>:<br/><a href="16-ic.html#SP11_2">§11.2</a>, <a href="16-ic.html#SP14">§14</a></span></button><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>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind_constructor</span><span class="plain-syntax"> *</span><span class="identifier-syntax">con</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Kinds::get_construct</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">iname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Kinds::Constructors::next_instance_iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">con</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">iname</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::derive_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">NEXT_INSTANCE_HL</span><span class="plain-syntax">, </span><a href="13-rsfk.html#SP24" class="function-link"><span class="function-syntax">Kinds::RunTime::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">), </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Kinds::Constructors::set_next_instance_iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">con</span><span class="plain-syntax">, </span><span class="identifier-syntax">iname</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="identifier-syntax">iname</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="function-syntax">PL::Counting::instance_count_iname</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">PL::Counting::instance_count_iname</span></span>:<br/><a href="16-ic.html#SP11_2">§11.2</a></span></button><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>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><a href="13-rsfk.html#SP3" class="function-link"><span class="function-syntax">Kinds::RunTime::I6_classnumber</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_1_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">2</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_2_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">3</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_3_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">4</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_4_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">5</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_5_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">6</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_6_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">7</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_7_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">8</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_8_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">9</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_9_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">10</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_10_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::derive_iname_in</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COUNT_INSTANCE_HL</span><span class="plain-syntax">, </span><a href="13-rsfk.html#SP24" class="function-link"><span class="function-syntax">Kinds::RunTime::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">), </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">PL::Counting::counting_compile_model_tables</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">PL::Counting::counting_compile_model_tables</span></span>:<br/><a href="16-ic.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_BASE_KINDS</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">Kinds::Behaviour::is_subkind_of_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">iname</span><span class="plain-syntax"> = </span><a href="16-ic.html#SP9" class="function-link"><span class="function-syntax">PL::Counting::first_instance</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">next</span><span class="plain-syntax"> = </span><a href="16-ic.html#SP7" class="function-link"><span class="function-syntax">PL::Counting::next_instance_of</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</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">next</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="27-em.html#SP3" class="function-link"><span class="function-syntax">Emit::named_iname_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">, </span><a href="6-ins.html#SP33" class="function-link"><span class="function-syntax">Instances::emitted_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">next</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><a href="27-em.html#SP3" class="function-link"><span class="function-syntax">Emit::named_iname_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</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="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. </b>Counting kinds of object, not very quickly:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">PL::Counting::kind_of_object_count</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">PL::Counting::kind_of_object_count</span></span>:<br/><a href="16-ic.html#SP11_3_1">§11.3.1</a></span></button><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>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</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">K</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="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IK</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_BASE_KINDS</span><span class="plain-syntax">(</span><span class="identifier-syntax">IK</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">Kinds::Behaviour::is_subkind_of_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">IK</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">c</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">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">IK</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</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="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. </b>So now the compiler can define the start of a linked list of instances
|
|
for a given kind, but how can it define the inductive step? The answer is
|
|
that every instance of kind number 4 (say) provides an I6 property <span class="extract"><span class="extract-syntax">IK4_Link</span></span>
|
|
whose value is the next instance, or else <span class="extract"><span class="extract-syntax">nothing</span></span> if it's the last.
|
|
</p>
|
|
|
|
<p class="commentary">A further property, <span class="extract"><span class="extract-syntax">IK4_Count</span></span>, holds the instance count; this is used for
|
|
efficient access to various-to-various relation storage at run-time. If we
|
|
have a relation of various doors to various rooms, say, we want to store a
|
|
bitmap only \(D\times R\) in size, but then to access this quickly given a
|
|
specific door and room, we need to convert these quickly to their indices;
|
|
this is what <span class="extract"><span class="extract-syntax">IK4_Count</span></span> does.
|
|
</p>
|
|
|
|
<p class="commentary">We create these properties, and assert these property values, during stage IV
|
|
of model completion:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">PL::Counting::counting_complete_model</span><button class="popup" onclick="togglePopup('usagePopup11')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup11">Usage of <span class="code-font"><span class="function-syntax">PL::Counting::counting_complete_model</span></span>:<br/><a href="16-ic.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">stage</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">stage</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="16-ic.html#SP11_1" class="named-paragraph-link"><span class="named-paragraph">Create and assert zero values of the vector property</span><span class="named-paragraph-number">11.1</span></a></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">stage</span><span class="plain-syntax"> == </span><span class="constant-syntax">4</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="16-ic.html#SP11_2" class="named-paragraph-link"><span class="named-paragraph">Create the two instance properties for each kind of object</span><span class="named-paragraph-number">11.2</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="16-ic.html#SP5" class="function-link"><span class="function-syntax">PL::Counting::make_instance_counts</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="16-ic.html#SP11_3" class="named-paragraph-link"><span class="named-paragraph">Assert values of the two instance properties for each instance</span><span class="named-paragraph-number">11.3</span></a></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="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP11_1" class="paragraph-anchor"></a><b>§11.1. </b>The <span class="extract"><span class="extract-syntax">vector</span></span> property exists only at the I6 level, and provides workspace
|
|
for the relation-route-finding code at run time.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Create and assert zero values of the vector property</span><span class="named-paragraph-number">11.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">P_vector</span><span class="plain-syntax"> = </span><a href="15-vp.html#SP3" class="function-link"><span class="function-syntax">Properties::Valued::new_nameless</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"vector"</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_number</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">zero</span><span class="plain-syntax"> = </span><a href="14-rv.html#SP8" class="function-link"><span class="function-syntax">Rvalues::from_int</span></a><span class="plain-syntax">(0, </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_OBJECT_INSTANCES</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><a href="15-vp.html#SP10" class="function-link"><span class="function-syntax">Properties::Valued::assert</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P_vector</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><a href="6-ins.html#SP12" class="function-link"><span class="function-syntax">Instances::as_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">), </span><span class="identifier-syntax">zero</span><span class="plain-syntax">, </span><span class="identifier-syntax">CERTAIN_CE</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="16-ic.html#SP11">§11</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP11_2" class="paragraph-anchor"></a><b>§11.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Create the two instance properties for each kind of object</span><span class="named-paragraph-number">11.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_BASE_KINDS</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">Kinds::Behaviour::is_subkind_of_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">subj</span><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="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">count_iname</span><span class="plain-syntax"> = </span><a href="16-ic.html#SP9" class="function-link"><span class="function-syntax">PL::Counting::instance_count_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">PF_S</span><span class="plain-syntax">(</span><span class="identifier-syntax">counting</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">)-></span><span class="element-syntax">instance_count_prop</span><span class="plain-syntax"> =</span>
|
|
<span class="plain-syntax"> </span><a href="15-vp.html#SP3" class="function-link"><span class="function-syntax">Properties::Valued::new_nameless_using</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_number</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">), </span><span class="identifier-syntax">count_iname</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">next_iname</span><span class="plain-syntax"> = </span><a href="16-ic.html#SP9" class="function-link"><span class="function-syntax">PL::Counting::next_instance</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">PF_S</span><span class="plain-syntax">(</span><span class="identifier-syntax">counting</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">)-></span><span class="element-syntax">instance_link_prop</span><span class="plain-syntax"> =</span>
|
|
<span class="plain-syntax"> </span><a href="15-vp.html#SP3" class="function-link"><span class="function-syntax">Properties::Valued::new_nameless_using</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_object</span><span class="plain-syntax">, </span><span class="identifier-syntax">Kinds::Behaviour::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">), </span><span class="identifier-syntax">next_iname</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">P_KD_Count</span><span class="plain-syntax"> = </span><a href="15-vp.html#SP3" class="function-link"><span class="function-syntax">Properties::Valued::new_nameless</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"KD_Count"</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_number</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="16-ic.html#SP11">§11</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP11_3" class="paragraph-anchor"></a><b>§11.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Assert values of the two instance properties for each instance</span><span class="named-paragraph-number">11.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_OBJECT_INSTANCES</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="16-ic.html#SP11_3_1" class="named-paragraph-link"><span class="named-paragraph">Fill in the special IK0-Count property</span><span class="named-paragraph-number">11.3.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">infs</span><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><a href="6-ins.html#SP17" class="function-link"><span class="function-syntax">Instances::to_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">infs</span><span class="plain-syntax">; </span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><a href="16-is.html#SP13" class="function-link"><span class="function-syntax">InferenceSubjects::narrowest_broader_subject</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="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax"> = </span><a href="16-is.html#SP18" class="function-link"><span class="function-syntax">InferenceSubjects::as_kind</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">Kinds::Behaviour::is_subkind_of_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">subj</span><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="plain-syntax"> </span><span class="identifier-syntax">PF_S</span><span class="plain-syntax">(</span><span class="identifier-syntax">counting</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">)-></span><span class="element-syntax">has_instances</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="16-ic.html#SP11_3_2" class="named-paragraph-link"><span class="named-paragraph">Fill in this IK-Count property</span><span class="named-paragraph-number">11.3.2</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="16-ic.html#SP11_3_3" class="named-paragraph-link"><span class="named-paragraph">Fill in this IK-Link property</span><span class="named-paragraph-number">11.3.3</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="16-ic.html#SP11">§11</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP11_3_1" class="paragraph-anchor"></a><b>§11.3.1. </b>As noted above, <span class="extract"><span class="extract-syntax">KD_Count</span></span> is a special case. This looks as if it should be
|
|
the instance count of "kind" itself, but that would be useless, since no
|
|
instance object can ever have kind "kind" — instances aren't kinds.
|
|
</p>
|
|
|
|
<p class="commentary">Instead it holds the kind number of its own (direct) kind. For example, if the
|
|
instance object is the red door, its <span class="extract"><span class="extract-syntax">KD_Count</span></span> value will be 4, meaning that
|
|
its kind is kind number 4, which according to the <span class="extract"><span class="extract-syntax">KindHierarchy</span></span> array is
|
|
<span class="extract"><span class="extract-syntax">K4_door</span></span>. Again, this is needed for rapid checking at run-time that property
|
|
usage is legal.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Fill in the special IK0-Count property</span><span class="named-paragraph-number">11.3.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ic</span><span class="plain-syntax"> = </span><a href="16-ic.html#SP10" class="function-link"><span class="function-syntax">PL::Counting::kind_of_object_count</span></a><span class="plain-syntax">(</span><a href="6-ins.html#SP17" class="function-link"><span class="function-syntax">Instances::to_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">the_count</span><span class="plain-syntax"> = </span><a href="14-rv.html#SP8" class="function-link"><span class="function-syntax">Rvalues::from_int</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ic</span><span class="plain-syntax">, </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="15-vp.html#SP10" class="function-link"><span class="function-syntax">Properties::Valued::assert</span></a><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">P_KD_Count</span><span class="plain-syntax">, </span><a href="6-ins.html#SP12" class="function-link"><span class="function-syntax">Instances::as_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">), </span><span class="identifier-syntax">the_count</span><span class="plain-syntax">, </span><span class="identifier-syntax">CERTAIN_CE</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="16-ic.html#SP11_3">§11.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP11_3_2" class="paragraph-anchor"></a><b>§11.3.2. </b>And otherwise, for every kind that the instance belongs to (directly or
|
|
indirectly) it gets the relevant instance count as a property value. For
|
|
example, the red door might have <span class="extract"><span class="extract-syntax">IK4_Count</span></span> set to 3 — it's door number 3,
|
|
let's suppose — and <span class="extract"><span class="extract-syntax">IK2_Count</span></span> set to 19 — it's thing number 19. It doesn't
|
|
have an <span class="extract"><span class="extract-syntax">IK7_Count</span></span> property at all, since it isn't a backdrop (kind number 7),
|
|
and so on for all other kinds.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Fill in this IK-Count property</span><span class="named-paragraph-number">11.3.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ic</span><span class="plain-syntax"> = </span><span class="identifier-syntax">INSTANCE_COUNT</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</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">the_count</span><span class="plain-syntax"> = </span><a href="14-rv.html#SP8" class="function-link"><span class="function-syntax">Rvalues::from_int</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ic</span><span class="plain-syntax">, </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="15-vp.html#SP10" class="function-link"><span class="function-syntax">Properties::Valued::assert</span></a><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">PF_S</span><span class="plain-syntax">(</span><span class="identifier-syntax">counting</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">)-></span><span class="element-syntax">instance_count_prop</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><a href="6-ins.html#SP12" class="function-link"><span class="function-syntax">Instances::as_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">), </span><span class="identifier-syntax">the_count</span><span class="plain-syntax">, </span><span class="identifier-syntax">CERTAIN_CE</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="16-ic.html#SP11_3">§11.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP11_3_3" class="paragraph-anchor"></a><b>§11.3.3. </b>The IK-Link property is never set for kind 0, so there's no special case. It
|
|
records the next instance in compilation order:
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Fill in this IK-Link property</span><span class="named-paragraph-number">11.3.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><a href="15-vp.html#SP10" class="function-link"><span class="function-syntax">Properties::Valued::assert</span></a><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">PF_S</span><span class="plain-syntax">(</span><span class="identifier-syntax">counting</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">)-></span><span class="element-syntax">instance_link_prop</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><a href="6-ins.html#SP12" class="function-link"><span class="function-syntax">Instances::as_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">), </span><a href="16-ic.html#SP8" class="function-link"><span class="function-syntax">PL::Counting::next_instance_of_as_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">), </span><span class="identifier-syntax">CERTAIN_CE</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="16-ic.html#SP11_3">§11.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>§12. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">PL::Counting::instance_count_property_symbol</span><button class="popup" onclick="togglePopup('usagePopup12')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup12">Usage of <span class="code-font"><span class="function-syntax">PL::Counting::instance_count_property_symbol</span></span>:<br/>Relations - <a href="7-rlt.html#SP14_2">§14.2</a></span></button><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>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Behaviour::is_subkind_of_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">subj</span><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="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">PF_S</span><span class="plain-syntax">(</span><span class="identifier-syntax">counting</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">)-></span><span class="element-syntax">instance_count_prop</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="15-pr.html#SP26" class="function-link"><span class="function-syntax">Properties::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</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="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP13" class="paragraph-anchor"></a><b>§13. Memory estimation. </b>We're going to need about 4 words of extra memory to store the two properties
|
|
per instance per kind, so:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">PL::Counting::counting_estimate_property_usage</span><button class="popup" onclick="togglePopup('usagePopup13')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup13">Usage of <span class="code-font"><span class="function-syntax">PL::Counting::counting_estimate_property_usage</span></span>:<br/><a href="16-ic.html#SP3">§3</a></span></button><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><span class="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">words_used</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><a href="16-is.html#SP13" class="function-link"><span class="function-syntax">InferenceSubjects::narrowest_broader_subject</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="plain-syntax"> </span><span class="identifier-syntax">infs</span><span class="plain-syntax">; </span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><a href="16-is.html#SP13" class="function-link"><span class="function-syntax">InferenceSubjects::narrowest_broader_subject</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="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">k2</span><span class="plain-syntax"> = </span><a href="16-is.html#SP18" class="function-link"><span class="function-syntax">InferenceSubjects::as_kind</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">Kinds::Behaviour::is_subkind_of_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">k2</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">words_used</span><span class="plain-syntax"> += </span><span class="constant-syntax">4</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="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP14" class="paragraph-anchor"></a><b>§14. Loop optimisation. </b>Lastly, then, the coup de gr\^ace: here's where we define loop schemas to
|
|
perform loops through kinds quickly at run-time. We start from the First
|
|
constants, and use the Link constants to progress; we stop at <span class="extract"><span class="extract-syntax">nothing</span></span>.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">PL::Counting::optimise_loop</span><button class="popup" onclick="togglePopup('usagePopup14')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup14">Usage of <span class="code-font"><span class="function-syntax">PL::Counting::optimise_loop</span></span>:<br/>Deciding to Defer - <a href="12-dtd.html#SP24">§24</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="26-pl.html#SP14" class="function-link"><span class="function-syntax">Plugins::Manage::plugged_in</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">counting_plugin</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subj</span><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="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">PF_S</span><span class="plain-syntax">(</span><span class="identifier-syntax">counting</span><span class="plain-syntax">, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">)-></span><span class="element-syntax">has_instances</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="comment-syntax"> (to avoid writing misleading code)</span>
|
|
<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">sch</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"for (*1=nothing: false: )"</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">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">first_iname</span><span class="plain-syntax"> = </span><a href="16-ic.html#SP9" class="function-link"><span class="function-syntax">PL::Counting::first_instance</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">next_iname</span><span class="plain-syntax"> = </span><a href="16-ic.html#SP9" class="function-link"><span class="function-syntax">PL::Counting::next_instance</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
|
|
<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">sch</span><span class="plain-syntax">, </span><span class="string-syntax">"for (*1=%n: *1: *1=*1.%n)"</span><span class="plain-syntax">, </span><span class="identifier-syntax">first_iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">next_iname</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="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
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