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<li><a href="../../../inweb/docs/foundation-module/index.html">foundation</a></li>
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<!--Weave of '16/ic' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">Source</a></li><li><a href="../compiler.html">Compiler 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><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="#SP1">§1. Definitions</a></li><li><a href="#SP4">§4. Plugin startup</a></li><li><a href="#SP5">§5. Initialising</a></li><li><a href="#SP6">§6. Computing instance counts</a></li><li><a href="#SP8">§8. Instance sequences</a></li><li><a href="#SP10">§10. Inform 6 representation</a></li><li><a href="#SP14">§14. Memory estimation</a></li><li><a href="#SP15">§15. Loop optimisation</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Definitions. </b></p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </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="display">
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<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">counting_data</span><span class="plain"> {</span>
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<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">property</span><span class="plain"> *</span><span class="identifier">instance_count_prop</span><span class="plain">; </span><span class="comment">the (<code class="display"><span class="extract">I6</span></code> only) IK-Count property for this kind</span>
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<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">property</span><span class="plain"> *</span><span class="identifier">instance_link_prop</span><span class="plain">; </span><span class="comment">the (<code class="display"><span class="extract">I6</span></code> only) IK-Link property for this kind</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">has_instances</span><span class="plain">; </span><span class="comment">are there any instances of this kind?</span>
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<span class="identifier">MEMORY_MANAGEMENT</span>
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<span class="plain">} </span><span class="reserved">counting_data</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The structure counting_data is private to this section.</p>
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<p class="inwebparagraph"><a id="SP3"></a><b>§3. </b>In addition to these I6 properties, two for each kind, there's a single
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additional property called <code class="display"><span class="extract">vector</span></code> 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="display">
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<span class="reserved">property</span><span class="plain"> *</span><span class="identifier">P_vector</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="reserved">property</span><span class="plain"> *</span><span class="identifier">P_KD_Count</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">; </span><span class="comment">see below</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP4"></a><b>§4. Plugin startup. </b></p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">PL::Counting::start</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="identifier">PLUGIN_REGISTER</span><span class="plain">(</span><span class="constant">PLUGIN_NEW_SUBJECT_NOTIFY</span><span class="plain">, </span><span class="functiontext">PL::Counting::counting_new_subject_notify</span><span class="plain">);</span>
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<span class="identifier">PLUGIN_REGISTER</span><span class="plain">(</span><span class="constant">PLUGIN_COMPLETE_MODEL</span><span class="plain">, </span><span class="functiontext">PL::Counting::counting_complete_model</span><span class="plain">);</span>
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<span class="identifier">PLUGIN_REGISTER</span><span class="plain">(</span><span class="constant">PLUGIN_COMPILE_MODEL_TABLES</span><span class="plain">, </span><span class="functiontext">PL::Counting::counting_compile_model_tables</span><span class="plain">);</span>
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<span class="identifier">PLUGIN_REGISTER</span><span class="plain">(</span><span class="constant">PLUGIN_ESTIMATE_PROPERTY_USAGE</span><span class="plain">, </span><span class="functiontext">PL::Counting::counting_estimate_property_usage</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function PL::Counting::start is used in 26/pl (<a href="26-pl.html#SP8">§8</a>).</p>
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<p class="inwebparagraph"><a id="SP5"></a><b>§5. 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="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">PL::Counting::counting_new_subject_notify</span><span class="plain">(</span><span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">subj</span><span class="plain">) {</span>
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<span class="identifier">CREATE_PF_DATA</span><span class="plain">(</span><span class="identifier">counting</span><span class="plain">, </span><span class="identifier">subj</span><span class="plain">, </span><span class="functiontext">PL::Counting::new_data</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="reserved">counting_data</span><span class="plain"> *</span><span class="functiontext">PL::Counting::new_data</span><span class="plain">(</span><span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">subj</span><span class="plain">) {</span>
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<span class="reserved">counting_data</span><span class="plain"> *</span><span class="identifier">cd</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">counting_data</span><span class="plain">);</span>
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<span class="identifier">cd</span><span class="plain">-></span><span class="element">instance_count_prop</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="identifier">cd</span><span class="plain">-></span><span class="element">instance_link_prop</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="identifier">cd</span><span class="plain">-></span><span class="element">has_instances</span><span class="plain"> = </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">cd</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function PL::Counting::counting_new_subject_notify is used in <a href="#SP4">§4</a>.</p>
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<p class="endnote">The function PL::Counting::new_data appears nowhere else.</p>
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<p class="inwebparagraph"><a id="SP6"></a><b>§6. 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 <code class="display"><span class="extract">I</span></code> within kind <code class="display"><span class="extract">k</span></code>. 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">
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<span class="definitionkeyword">define</span> <span class="identifier">INSTANCE_COUNT</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">)</span>
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<span class="identifier">kind_instance_counts</span><span class="plain">[(</span><span class="identifier">I</span><span class="plain">)-></span><span class="identifier">allocation_id</span><span class="plain">*</span><span class="identifier">max_kind_instance_count</span><span class="plain"> +</span>
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<span class="functiontext">Kinds::RunTime::I6_classnumber</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">)]</span>
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</pre>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> *</span><span class="identifier">kind_instance_counts</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">max_kind_instance_count</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">PL::Counting::make_instance_counts</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<<span class="cwebmacro">Allocate the instance count array in memory</span> <span class="cwebmacronumber">6.1</span>><span class="plain">;</span>
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<<span class="cwebmacro">Compute the instance count array</span> <span class="cwebmacronumber">6.2</span>><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function PL::Counting::make_instance_counts is used in <a href="#SP12">§12</a>.</p>
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<p class="inwebparagraph"><a id="SP6_1"></a><b>§6.1. </b><code class="display">
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<<span class="cwebmacrodefn">Allocate the instance count array in memory</span> <span class="cwebmacronumber">6.1</span>> =
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</code></p>
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<pre class="displaydefn">
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<span class="identifier">max_kind_instance_count</span><span class="plain"> = </span><span class="identifier">NUMBER_CREATED</span><span class="plain">(</span><span class="reserved">inference_subject</span><span class="plain">);</span>
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<span class="identifier">kind_instance_counts</span><span class="plain"> =</span>
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<span class="identifier">Memory::I7_calloc</span><span class="plain">(</span><span class="identifier">max_kind_instance_count</span><span class="plain">*</span><span class="identifier">max_kind_instance_count</span><span class="plain">, </span><span class="reserved">sizeof</span><span class="plain">(</span><span class="reserved">int</span><span class="plain">),</span>
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<span class="constant">INSTANCE_COUNTING_MREASON</span><span class="plain">);</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">This code is used in <a href="#SP6">§6</a>.</p>
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<p class="inwebparagraph"><a id="SP6_2"></a><b>§6.2. </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="macrodefinition"><code class="display">
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<<span class="cwebmacrodefn">Compute the instance count array</span> <span class="cwebmacronumber">6.2</span>> =
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</code></p>
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<pre class="displaydefn">
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<span class="reserved">instance</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">;</span>
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<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">;</span>
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<span class="identifier">LOOP_OVER_BASE_KINDS</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">)</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Compare::lt</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">))</span>
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<span class="identifier">LOOP_OVER_OBJECT_INSTANCES</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">)</span>
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<span class="identifier">INSTANCE_COUNT</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">) = -1;</span>
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<span class="identifier">LOOP_OVER_BASE_KINDS</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">)</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Compare::lt</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">)) {</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">ix_count</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
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<span class="identifier">LOOP_OVER_INSTANCES</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">)</span>
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<span class="identifier">INSTANCE_COUNT</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">) = </span><span class="identifier">ix_count</span><span class="plain">++;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">This code is used in <a href="#SP6">§6</a>.</p>
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<p class="inwebparagraph"><a id="SP7"></a><b>§7. </b>Instance counts are actually useful to several other plugins, so we provide:
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</p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">PL::Counting::instance_count</span><span class="plain">(</span><span class="reserved">instance</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">kind_instance_counts</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"instance counts not available"</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">K</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"instance counts available only for objects"</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">INSTANCE_COUNT</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function PL::Counting::instance_count appears nowhere else.</p>
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<p class="inwebparagraph"><a id="SP8"></a><b>§8. Instance sequences. </b>At run-time we're going to want to loop through objects in order of their
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definition in the I6 code, which is not the same as their creation order in I7.
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(This is so that an optimised and an unoptimised loop to perform the same
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search will not only iterate through the same set of objects, but in the
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same order.)
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</p>
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<p class="inwebparagraph">The following abstracts the linked list in compilation sequence. Note that
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it excludes instances which have been "diverted", which is mainly used
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to get rid of the <code class="display"><span class="extract">selfobj</span></code> object in cases where the source text creates
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an explicit player.
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</p>
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<pre class="display">
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<span class="reserved">instance</span><span class="plain"> *</span><span class="functiontext">PL::Counting::next_instance_of</span><span class="plain">(</span><span class="reserved">instance</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">k</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">k</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">resuming</span><span class="plain"> = </span><span class="identifier">TRUE</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">I</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) { </span><span class="identifier">I</span><span class="plain"> = </span><span class="constant">FIRST_IN_COMPILATION_SEQUENCE</span><span class="plain">; </span><span class="identifier">resuming</span><span class="plain"> = </span><span class="identifier">FALSE</span><span class="plain">; }</span>
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<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">I</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">resuming</span><span class="plain">) </span><span class="identifier">I</span><span class="plain"> = </span><span class="identifier">NEXT_IN_COMPILATION_SEQUENCE</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">);</span>
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<span class="identifier">resuming</span><span class="plain"> = </span><span class="identifier">TRUE</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">I</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">break</span><span class="plain">;</span>
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|
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext">InferenceSubjects::aliased_but_diverted</span><span class="plain">(</span><span class="functiontext">Instances::as_subject</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">)))</span>
|
|
<span class="reserved">continue</span><span class="plain">; </span><span class="comment"><code class="display"><span class="extract">selfobj</span></code> may not count</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext">Instances::of_kind</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">k</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">I</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">The function PL::Counting::next_instance_of is used in <a href="#SP9">§9</a>, <a href="#SP10">§10</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP9"></a><b>§9. </b>For compilation purposes, it's useful to express this as a specification:
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="functiontext">PL::Counting::next_instance_of_as_value</span><span class="plain">(</span><span class="reserved">instance</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">k</span><span class="plain">) {</span>
|
|
<span class="reserved">instance</span><span class="plain"> *</span><span class="identifier">next</span><span class="plain"> = </span><span class="functiontext">PL::Counting::next_instance_of</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">k</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">next</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Rvalues::from_instance</span><span class="plain">(</span><span class="identifier">next</span><span class="plain">);</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Rvalues::new_nothing_object_constant</span><span class="plain">();</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">The function PL::Counting::next_instance_of_as_value is used in <a href="#SP12_3_3">§12.3.3</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP10"></a><b>§10. 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="inwebparagraph">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="display">
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="functiontext">PL::Counting::first_instance</span><span class="plain">(</span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">) {</span>
|
|
<span class="identifier">kind_constructor</span><span class="plain"> *</span><span class="identifier">con</span><span class="plain"> = </span><span class="identifier">Kinds::get_construct</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">iname</span><span class="plain"> = </span><span class="identifier">Kinds::Constructors::first_instance_iname</span><span class="plain">(</span><span class="identifier">con</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">iname</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
|
|
<span class="identifier">iname</span><span class="plain"> = </span><span class="functiontext">Hierarchy::derive_iname_in</span><span class="plain">(</span><span class="constant">FIRST_INSTANCE_HL</span><span class="plain">, </span><span class="functiontext">Kinds::RunTime::iname</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">), </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="identifier">Kinds::Constructors::set_first_instance_iname</span><span class="plain">(</span><span class="identifier">con</span><span class="plain">, </span><span class="identifier">iname</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">iname</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="functiontext">PL::Counting::next_instance</span><span class="plain">(</span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">) {</span>
|
|
<span class="identifier">kind_constructor</span><span class="plain"> *</span><span class="identifier">con</span><span class="plain"> = </span><span class="identifier">Kinds::get_construct</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">iname</span><span class="plain"> = </span><span class="identifier">Kinds::Constructors::next_instance_iname</span><span class="plain">(</span><span class="identifier">con</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">iname</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
|
|
<span class="identifier">iname</span><span class="plain"> = </span><span class="functiontext">Hierarchy::derive_iname_in</span><span class="plain">(</span><span class="constant">NEXT_INSTANCE_HL</span><span class="plain">, </span><span class="functiontext">Kinds::RunTime::iname</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">), </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="identifier">Kinds::Constructors::set_next_instance_iname</span><span class="plain">(</span><span class="identifier">con</span><span class="plain">, </span><span class="identifier">iname</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">iname</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="functiontext">PL::Counting::instance_count_iname</span><span class="plain">(</span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">) {</span>
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">N</span><span class="plain"> = </span><span class="functiontext">Kinds::RunTime::I6_classnumber</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">1</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_1_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">2</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_2_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">3</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_3_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">4</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_4_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">5</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_5_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">6</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_6_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">7</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_7_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">8</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_8_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">9</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_9_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">N</span><span class="plain"> == </span><span class="constant">10</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::make_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_10_HL</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Hierarchy::derive_iname_in</span><span class="plain">(</span><span class="constant">COUNT_INSTANCE_HL</span><span class="plain">, </span><span class="functiontext">Kinds::RunTime::iname</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">), </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">));</span>
|
|
<span class="plain">}</span>
|
|
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">PL::Counting::counting_compile_model_tables</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
|
|
<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">;</span>
|
|
<span class="identifier">LOOP_OVER_BASE_KINDS</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">)</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Compare::lt</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">)) {</span>
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">iname</span><span class="plain"> = </span><span class="functiontext">PL::Counting::first_instance</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="reserved">instance</span><span class="plain"> *</span><span class="identifier">next</span><span class="plain"> = </span><span class="functiontext">PL::Counting::next_instance_of</span><span class="plain">(</span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">next</span><span class="plain">) {</span>
|
|
<span class="functiontext">Emit::named_iname_constant</span><span class="plain">(</span><span class="identifier">iname</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">, </span><span class="functiontext">Instances::emitted_iname</span><span class="plain">(</span><span class="identifier">next</span><span class="plain">));</span>
|
|
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
|
|
<span class="functiontext">Emit::named_iname_constant</span><span class="plain">(</span><span class="identifier">iname</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">The function PL::Counting::first_instance is used in <a href="#SP15">§15</a>.</p>
|
|
|
|
<p class="endnote">The function PL::Counting::next_instance is used in <a href="#SP12_2">§12.2</a>, <a href="#SP15">§15</a>.</p>
|
|
|
|
<p class="endnote">The function PL::Counting::instance_count_iname is used in <a href="#SP12_2">§12.2</a>.</p>
|
|
|
|
<p class="endnote">The function PL::Counting::counting_compile_model_tables is used in <a href="#SP4">§4</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP11"></a><b>§11. </b>Counting kinds of object, not very quickly:
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">PL::Counting::kind_of_object_count</span><span class="plain">(</span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">) {</span>
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">c</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">K</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="constant">0</span><span class="plain">;</span>
|
|
<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">IK</span><span class="plain">;</span>
|
|
<span class="identifier">LOOP_OVER_BASE_KINDS</span><span class="plain">(</span><span class="identifier">IK</span><span class="plain">)</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Compare::lt</span><span class="plain">(</span><span class="identifier">IK</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">)) {</span>
|
|
<span class="identifier">c</span><span class="plain">++;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Compare::eq</span><span class="plain">(</span><span class="identifier">IK</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">c</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="constant">0</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">The function PL::Counting::kind_of_object_count is used in <a href="#SP12_3_1">§12.3.1</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP12"></a><b>§12. </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 <code class="display"><span class="extract">IK4_Link</span></code>
|
|
whose value is the next instance, or else <code class="display"><span class="extract">nothing</span></code> if it's the last.
|
|
</p>
|
|
|
|
<p class="inwebparagraph">A further property, <code class="display"><span class="extract">IK4_Count</span></code>, 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* 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 <code class="display"><span class="extract">IK4_Count</span></code> does.
|
|
</p>
|
|
|
|
<p class="inwebparagraph">We create these properties, and assert these property values, during stage IV
|
|
of model completion:
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">PL::Counting::counting_complete_model</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">stage</span><span class="plain">) {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stage</span><span class="plain"> == </span><span class="constant">1</span><span class="plain">) {</span>
|
|
<<span class="cwebmacro">Create and assert zero values of the vector property</span> <span class="cwebmacronumber">12.1</span>><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stage</span><span class="plain"> == </span><span class="constant">4</span><span class="plain">) {</span>
|
|
<<span class="cwebmacro">Create the two instance properties for each kind of object</span> <span class="cwebmacronumber">12.2</span>><span class="plain">;</span>
|
|
<span class="functiontext">PL::Counting::make_instance_counts</span><span class="plain">();</span>
|
|
<<span class="cwebmacro">Assert values of the two instance properties for each instance</span> <span class="cwebmacronumber">12.3</span>><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">The function PL::Counting::counting_complete_model is used in <a href="#SP4">§4</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP12_1"></a><b>§12.1. </b>The <code class="display"><span class="extract">vector</span></code> property exists only at the I6 level, and provides workspace
|
|
for the relation-route-finding code at run time.
|
|
</p>
|
|
|
|
|
|
<p class="macrodefinition"><code class="display">
|
|
<<span class="cwebmacrodefn">Create and assert zero values of the vector property</span> <span class="cwebmacronumber">12.1</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="identifier">P_vector</span><span class="plain"> = </span><span class="functiontext">Properties::Valued::new_nameless</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"vector"</span><span class="plain">, </span><span class="identifier">K_number</span><span class="plain">);</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">zero</span><span class="plain"> = </span><span class="functiontext">Rvalues::from_int</span><span class="plain">(0, </span><span class="identifier">EMPTY_WORDING</span><span class="plain">);</span>
|
|
<span class="reserved">instance</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">;</span>
|
|
<span class="identifier">LOOP_OVER_OBJECT_INSTANCES</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">)</span>
|
|
<span class="functiontext">Properties::Valued::assert</span><span class="plain">(</span><span class="identifier">P_vector</span><span class="plain">,</span>
|
|
<span class="functiontext">Instances::as_subject</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">), </span><span class="identifier">zero</span><span class="plain">, </span><span class="identifier">CERTAIN_CE</span><span class="plain">);</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="#SP12">§12</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP12_2"></a><b>§12.2. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Create the two instance properties for each kind of object</span> <span class="cwebmacronumber">12.2</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">;</span>
|
|
<span class="identifier">LOOP_OVER_BASE_KINDS</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">)</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Compare::lt</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">)) {</span>
|
|
<span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">subj</span><span class="plain"> = </span><span class="functiontext">Kinds::Knowledge::as_subject</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">count_iname</span><span class="plain"> = </span><span class="functiontext">PL::Counting::instance_count_iname</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
|
|
<span class="identifier">PF_S</span><span class="plain">(</span><span class="identifier">counting</span><span class="plain">, </span><span class="identifier">subj</span><span class="plain">)-></span><span class="element">instance_count_prop</span><span class="plain"> =</span>
|
|
<span class="functiontext">Properties::Valued::new_nameless_using</span><span class="plain">(</span><span class="identifier">K_number</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">), </span><span class="identifier">count_iname</span><span class="plain">);</span>
|
|
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">next_iname</span><span class="plain"> = </span><span class="functiontext">PL::Counting::next_instance</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="identifier">PF_S</span><span class="plain">(</span><span class="identifier">counting</span><span class="plain">, </span><span class="identifier">subj</span><span class="plain">)-></span><span class="element">instance_link_prop</span><span class="plain"> =</span>
|
|
<span class="functiontext">Properties::Valued::new_nameless_using</span><span class="plain">(</span><span class="identifier">K_object</span><span class="plain">, </span><span class="identifier">Kinds::Behaviour::package</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">), </span><span class="identifier">next_iname</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="identifier">P_KD_Count</span><span class="plain"> = </span><span class="functiontext">Properties::Valued::new_nameless</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"KD_Count"</span><span class="plain">, </span><span class="identifier">K_number</span><span class="plain">);</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="#SP12">§12</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP12_3"></a><b>§12.3. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Assert values of the two instance properties for each instance</span> <span class="cwebmacronumber">12.3</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="reserved">instance</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">;</span>
|
|
<span class="identifier">LOOP_OVER_OBJECT_INSTANCES</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">) {</span>
|
|
<<span class="cwebmacro">Fill in the special IK0-Count property</span> <span class="cwebmacronumber">12.3.1</span>><span class="plain">;</span>
|
|
<span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">infs</span><span class="plain">;</span>
|
|
<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">infs</span><span class="plain"> = </span><span class="functiontext">Kinds::Knowledge::as_subject</span><span class="plain">(</span><span class="functiontext">Instances::to_kind</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">));</span>
|
|
<span class="identifier">infs</span><span class="plain">; </span><span class="identifier">infs</span><span class="plain"> = </span><span class="functiontext">InferenceSubjects::narrowest_broader_subject</span><span class="plain">(</span><span class="identifier">infs</span><span class="plain">)) {</span>
|
|
<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain"> = </span><span class="functiontext">InferenceSubjects::as_kind</span><span class="plain">(</span><span class="identifier">infs</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Compare::lt</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">)) {</span>
|
|
<span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">subj</span><span class="plain"> = </span><span class="functiontext">Kinds::Knowledge::as_subject</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="identifier">PF_S</span><span class="plain">(</span><span class="identifier">counting</span><span class="plain">, </span><span class="identifier">subj</span><span class="plain">)-></span><span class="element">has_instances</span><span class="plain"> = </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<<span class="cwebmacro">Fill in this IK-Count property</span> <span class="cwebmacronumber">12.3.2</span>><span class="plain">;</span>
|
|
<<span class="cwebmacro">Fill in this IK-Link property</span> <span class="cwebmacronumber">12.3.3</span>><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="#SP12">§12</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP12_3_1"></a><b>§12.3.1. </b>As noted above, <code class="display"><span class="extract">KD_Count</span></code> 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="inwebparagraph">Instead it holds the kind number of its own (direct) kind. For example, if the
|
|
instance object is the red door, its <code class="display"><span class="extract">KD_Count</span></code> value will be 4, meaning that
|
|
its kind is kind number 4, which according to the <code class="display"><span class="extract">KindHierarchy</span></code> array is
|
|
<code class="display"><span class="extract">K4_door</span></code>. Again, this is needed for rapid checking at run-time that property
|
|
usage is legal.
|
|
</p>
|
|
|
|
|
|
<p class="macrodefinition"><code class="display">
|
|
<<span class="cwebmacrodefn">Fill in the special IK0-Count property</span> <span class="cwebmacronumber">12.3.1</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">ic</span><span class="plain"> = </span><span class="functiontext">PL::Counting::kind_of_object_count</span><span class="plain">(</span><span class="functiontext">Instances::to_kind</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">));</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">the_count</span><span class="plain"> = </span><span class="functiontext">Rvalues::from_int</span><span class="plain">(</span><span class="identifier">ic</span><span class="plain">, </span><span class="identifier">EMPTY_WORDING</span><span class="plain">);</span>
|
|
<span class="functiontext">Properties::Valued::assert</span><span class="plain">(</span>
|
|
<span class="identifier">P_KD_Count</span><span class="plain">, </span><span class="functiontext">Instances::as_subject</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">), </span><span class="identifier">the_count</span><span class="plain">, </span><span class="identifier">CERTAIN_CE</span><span class="plain">);</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="#SP12_3">§12.3</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP12_3_2"></a><b>§12.3.2. </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 <code class="display"><span class="extract">IK4_Count</span></code> set to 3 — it's door number 3,
|
|
let's suppose — and <code class="display"><span class="extract">IK2_Count</span></code> set to 19 — it's thing number 19. It doesn't
|
|
have an <code class="display"><span class="extract">IK7_Count</span></code> property at all, since it isn't a backdrop (kind number 7),
|
|
and so on for all other kinds.
|
|
</p>
|
|
|
|
|
|
<p class="macrodefinition"><code class="display">
|
|
<<span class="cwebmacrodefn">Fill in this IK-Count property</span> <span class="cwebmacronumber">12.3.2</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">ic</span><span class="plain"> = </span><span class="identifier">INSTANCE_COUNT</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">the_count</span><span class="plain"> = </span><span class="functiontext">Rvalues::from_int</span><span class="plain">(</span><span class="identifier">ic</span><span class="plain">, </span><span class="identifier">EMPTY_WORDING</span><span class="plain">);</span>
|
|
<span class="functiontext">Properties::Valued::assert</span><span class="plain">(</span>
|
|
<span class="identifier">PF_S</span><span class="plain">(</span><span class="identifier">counting</span><span class="plain">, </span><span class="identifier">subj</span><span class="plain">)-></span><span class="element">instance_count_prop</span><span class="plain">,</span>
|
|
<span class="functiontext">Instances::as_subject</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">), </span><span class="identifier">the_count</span><span class="plain">, </span><span class="identifier">CERTAIN_CE</span><span class="plain">);</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="#SP12_3">§12.3</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP12_3_3"></a><b>§12.3.3. </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="macrodefinition"><code class="display">
|
|
<<span class="cwebmacrodefn">Fill in this IK-Link property</span> <span class="cwebmacronumber">12.3.3</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="functiontext">Properties::Valued::assert</span><span class="plain">(</span>
|
|
<span class="identifier">PF_S</span><span class="plain">(</span><span class="identifier">counting</span><span class="plain">, </span><span class="identifier">subj</span><span class="plain">)-></span><span class="element">instance_link_prop</span><span class="plain">,</span>
|
|
<span class="functiontext">Instances::as_subject</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">), </span><span class="functiontext">PL::Counting::next_instance_of_as_value</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">), </span><span class="identifier">CERTAIN_CE</span><span class="plain">);</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="#SP12_3">§12.3</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP13"></a><b>§13. </b></p>
|
|
|
|
<pre class="display">
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="functiontext">PL::Counting::instance_count_property_symbol</span><span class="plain">(</span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">) {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Compare::lt</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">)) {</span>
|
|
<span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">subj</span><span class="plain"> = </span><span class="functiontext">Kinds::Knowledge::as_subject</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="reserved">property</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain"> = </span><span class="identifier">PF_S</span><span class="plain">(</span><span class="identifier">counting</span><span class="plain">, </span><span class="identifier">subj</span><span class="plain">)-></span><span class="element">instance_count_prop</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">P</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Properties::iname</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">The function PL::Counting::instance_count_property_symbol is used in 6/rlt (<a href="6-rlt.html#SP20_2">§20.2</a>).</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP14"></a><b>§14. 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="display">
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">PL::Counting::counting_estimate_property_usage</span><span class="plain">(</span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">k</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> *</span><span class="identifier">words_used</span><span class="plain">) {</span>
|
|
<span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">infs</span><span class="plain">;</span>
|
|
<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">infs</span><span class="plain"> = </span><span class="functiontext">InferenceSubjects::narrowest_broader_subject</span><span class="plain">(</span><span class="functiontext">Kinds::Knowledge::as_subject</span><span class="plain">(</span><span class="identifier">k</span><span class="plain">));</span>
|
|
<span class="identifier">infs</span><span class="plain">; </span><span class="identifier">infs</span><span class="plain"> = </span><span class="functiontext">InferenceSubjects::narrowest_broader_subject</span><span class="plain">(</span><span class="identifier">infs</span><span class="plain">)) {</span>
|
|
<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">k2</span><span class="plain"> = </span><span class="functiontext">InferenceSubjects::as_kind</span><span class="plain">(</span><span class="identifier">infs</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Compare::lt</span><span class="plain">(</span><span class="identifier">k2</span><span class="plain">, </span><span class="identifier">K_object</span><span class="plain">))</span>
|
|
<span class="plain">*</span><span class="identifier">words_used</span><span class="plain"> += </span><span class="constant">4</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">The function PL::Counting::counting_estimate_property_usage is used in <a href="#SP4">§4</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP15"></a><b>§15. 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 <code class="display"><span class="extract">nothing</span></code>.
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">PL::Counting::optimise_loop</span><span class="plain">(</span><span class="reserved">i6_schema</span><span class="plain"> *</span><span class="identifier">sch</span><span class="plain">, </span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">) {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext">Plugins::Manage::plugged_in</span><span class="plain">(</span><span class="identifier">counting_plugin</span><span class="plain">) == </span><span class="identifier">FALSE</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
|
|
<span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">subj</span><span class="plain"> = </span><span class="functiontext">Kinds::Knowledge::as_subject</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">PF_S</span><span class="plain">(</span><span class="identifier">counting</span><span class="plain">, </span><span class="identifier">subj</span><span class="plain">)-></span><span class="element">has_instances</span><span class="plain"> == </span><span class="identifier">FALSE</span><span class="plain">) </span><span class="comment">(to avoid writing misleading code)</span>
|
|
<span class="functiontext">Calculus::Schemas::modify</span><span class="plain">(</span><span class="identifier">sch</span><span class="plain">,</span>
|
|
<span class="string">"for (*1=nothing: false: )"</span><span class="plain">);</span>
|
|
<span class="reserved">else</span><span class="plain"> {</span>
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">first_iname</span><span class="plain"> = </span><span class="functiontext">PL::Counting::first_instance</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">next_iname</span><span class="plain"> = </span><span class="functiontext">PL::Counting::next_instance</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">);</span>
|
|
<span class="functiontext">Calculus::Schemas::modify</span><span class="plain">(</span><span class="identifier">sch</span><span class="plain">, </span><span class="string">"for (*1=%n: *1: *1=*1.%n)"</span><span class="plain">, </span><span class="identifier">first_iname</span><span class="plain">, </span><span class="identifier">next_iname</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">The function PL::Counting::optimise_loop is used in 12/dtd (<a href="12-dtd.html#SP24">§24</a>).</p>
|
|
|
|
<hr class="tocbar">
|
|
<ul class="toc"><li><a href="16-cmw2.html">Back to 'Compile Model World'</a></li><li><i>(This section ends Chapter 16: Inference and Model.)</i></li></ul><hr class="tocbar">
|
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<!--End of weave-->
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</main>
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</body>
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</html>
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