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<a href='https://github.com/akkartik/mu/blob/master/033exclusive_container.cc'>https://github.com/akkartik/mu/blob/master/033exclusive_container.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Exclusive containers contain exactly one of a fixed number of 'variants'</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: of different types.</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//:</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: They also implicitly contain a tag describing precisely which variant is</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: currently stored in them.</span>
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span><span class="Delimiter">:(before "End Mu Types Initialization")</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment">//: We'll use this container as a running example, with two number elements.</span>
<span id="L9" class="LineNr"> 9 </span><span class="Delimiter">{</span>
<span id="L10" class="LineNr"> 10 </span><a href='010vm.cc.html#L125'>type_ordinal</a> tmp = <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span><span class="Special">Type_ordinal</span><span class="Delimiter">,</span> <span class="Constant">"number-or-point"</span><span class="Delimiter">,</span> <span class="Special">Next_type_ordinal</span>++<span class="Delimiter">);</span>
<span id="L11" class="LineNr"> 11 </span><a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> tmp<span class="Delimiter">);</span> <span class="Comment">// initialize</span>
<span id="L12" class="LineNr"> 12 </span>get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> tmp<span class="Delimiter">).</span>kind = <a href='010vm.cc.html#L181'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">;</span>
<span id="L13" class="LineNr"> 13 </span>get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> tmp<span class="Delimiter">).</span>name = <span class="Constant">"number-or-point"</span><span class="Delimiter">;</span>
<span id="L14" class="LineNr"> 14 </span>get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> tmp<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">"i:number"</span><span class="Delimiter">));</span>
<span id="L15" class="LineNr"> 15 </span>get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> tmp<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">"p:point"</span><span class="Delimiter">));</span>
<span id="L16" class="LineNr"> 16 </span><span class="Delimiter">}</span>
<span id="L17" class="LineNr"> 17 </span>
<span id="L18" class="LineNr"> 18 </span><span class="Comment">//: Tests in this layer often explicitly set up memory before reading it as a</span>
<span id="L19" class="LineNr"> 19 </span><span class="Comment">//: container. Don't do this in general. I'm tagging such cases with /unsafe;</span>
<span id="L20" class="LineNr"> 20 </span><span class="Comment">//: they'll be exceptions to later checks.</span>
<span id="L21" class="LineNr"> 21 </span><span class="Delimiter">:(scenario copy_exclusive_container)</span>
<span id="L22" class="LineNr"> 22 </span><span class="Comment"># Copying exclusive containers copies all their contents and an extra location for the tag.</span>
<span id="L23" class="LineNr"> 23 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L24" class="LineNr"> 24 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">1</span> <span class="Comment"># 'point' variant</span>
<span id="L25" class="LineNr"> 25 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L26" class="LineNr"> 26 </span> <span class="Constant">3</span>:num<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span id="L27" class="LineNr"> 27 </span> <span class="Constant">4</span>:number-<span class="Normal">or</span>-point<span class="Special"> <- </span>copy <span class="Constant">1</span>:number-<span class="Normal">or</span>-point/unsafe
<span id="L28" class="LineNr"> 28 </span>]
<span id="L29" class="LineNr"> 29 </span><span class="traceContains">+mem: storing 1 in location 4</span>
<span id="L30" class="LineNr"> 30 </span><span class="traceContains">+mem: storing 34 in location 5</span>
<span id="L31" class="LineNr"> 31 </span><span class="traceContains">+mem: storing 35 in location 6</span>
<span id="L32" class="LineNr"> 32 </span>
<span id="L33" class="LineNr"> 33 </span><span class="Delimiter">:(before "End size_of(type) Special-cases")</span>
<span id="L34" class="LineNr"> 34 </span><span class="Normal">if</span> <span class="Delimiter">(</span>t<span class="Delimiter">.</span>kind == <a href='010vm.cc.html#L181'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Comment">// size of an exclusive container is the size of its largest variant</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Comment">// (So like containers, it can't contain arrays.)</span>
<span id="L37" class="LineNr"> 37 </span> <span class="Normal">int</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L38" class="LineNr"> 38 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L39" class="LineNr"> 39 </span> reagent tmp<span class="Delimiter">;</span>
<span id="L40" class="LineNr"> 40 </span> tmp<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*type<span class="Delimiter">);</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Normal">int</span> size = size_of<span class="Delimiter">(</span>variant_type<span class="Delimiter">(</span>tmp<span class="Delimiter">,</span> i<span class="Delimiter">));</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>size > result<span class="Delimiter">)</span> result = size<span class="Delimiter">;</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Delimiter">}</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Comment">// ...+1 for its tag.</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Identifier">return</span> result+<span class="Constant">1</span><span class="Delimiter">;</span>
<span id="L46" class="LineNr"> 46 </span><span class="Delimiter">}</span>
<span id="L47" class="LineNr"> 47 </span>
<span id="L48" class="LineNr"> 48 </span><span class="SalientComment">//:: To access variants of an exclusive container, use 'maybe-convert'.</span>
<span id="L49" class="LineNr"> 49 </span><span class="Comment">//: It always returns an address (so that you can modify it) or null (to</span>
<span id="L50" class="LineNr"> 50 </span><span class="Comment">//: signal that the conversion failed (because the container contains a</span>
<span id="L51" class="LineNr"> 51 </span><span class="Comment">//: different variant).</span>
<span id="L52" class="LineNr"> 52 </span>
<span id="L53" class="LineNr"> 53 </span><span class="Comment">//: 'maybe-convert' requires a literal in ingredient 1. We'll use a synonym</span>
<span id="L54" class="LineNr"> 54 </span><span class="Comment">//: called 'variant'.</span>
<span id="L55" class="LineNr"> 55 </span><span class="Delimiter">:(before "End Mu Types Initialization")</span>
<span id="L56" class="LineNr"> 56 </span><a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span><span class="Special">Type_ordinal</span><span class="Delimiter">,</span> <span class="Constant">"variant"</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L57" class="LineNr"> 57 </span>
<span id="L58" class="LineNr"> 58 </span><span class="Delimiter">:(scenario maybe_convert)</span>
<span id="L59" class="LineNr"> 59 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L60" class="LineNr"> 60 </span> <span class="Constant">12</span>:num<span class="Special"> <- </span>copy <span class="Constant">1</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Constant">13</span>:num<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span id="L62" class="LineNr"> 62 </span> <span class="Constant">14</span>:num<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Constant">20</span>:point<span class="Delimiter">,</span> <span class="Constant">22</span>:<span class="Normal">bool</span><span class="Special"> <- </span>maybe-convert <span class="Constant">12</span>:number-<span class="Normal">or</span>-point/unsafe<span class="Delimiter">,</span> <span class="Constant">1:variant</span>
<span id="L64" class="LineNr"> 64 </span>]
<span id="L65" class="LineNr"> 65 </span><span class="Comment"># boolean</span>
<span id="L66" class="LineNr"> 66 </span><span class="traceContains">+mem: storing 1 in location 22</span>
<span id="L67" class="LineNr"> 67 </span><span class="Comment"># point</span>
<span id="L68" class="LineNr"> 68 </span><span class="traceContains">+mem: storing 35 in location 20</span>
<span id="L69" class="LineNr"> 69 </span><span class="traceContains">+mem: storing 36 in location 21</span>
<span id="L70" class="LineNr"> 70 </span>
<span id="L71" class="LineNr"> 71 </span><span class="Delimiter">:(scenario maybe_convert_fail)</span>
<span id="L72" class="LineNr"> 72 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L73" class="LineNr"> 73 </span> <span class="Constant">12</span>:num<span class="Special"> <- </span>copy <span class="Constant">1</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Constant">13</span>:num<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Constant">14</span>:num<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span id="L76" class="LineNr"> 76 </span> <span class="Constant">20</span>:num<span class="Delimiter">,</span> <span class="Constant">21</span>:<span class="Normal">bool</span><span class="Special"> <- </span>maybe-convert <span class="Constant">12</span>:number-<span class="Normal">or</span>-point/unsafe<span class="Delimiter">,</span> <span class="Constant">0:variant</span>
<span id="L77" class="LineNr"> 77 </span>]
<span id="L78" class="LineNr"> 78 </span><span class="Comment"># boolean</span>
<span id="L79" class="LineNr"> 79 </span><span class="traceContains">+mem: storing 0 in location 21</span>
<span id="L80" class="LineNr"> 80 </span><span class="Comment"># number: no write</span>
<span id="L81" class="LineNr"> 81 </span>
<span id="L82" class="LineNr"> 82 </span><span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
<span id="L83" class="LineNr"> 83 </span>MAYBE_CONVERT<span class="Delimiter">,</span>
<span id="L84" class="LineNr"> 84 </span><span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
<span id="L85" class="LineNr"> 85 </span><a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span><span class="Special">Recipe_ordinal</span><span class="Delimiter">,</span> <span class="Constant">"maybe-convert"</span><span class="Delimiter">,</span> MAYBE_CONVERT<span class="Delimiter">);</span>
<span id="L86" class="LineNr"> 86 </span><span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
<span id="L87" class="LineNr"> 87 </span><span class="Normal">case</span> MAYBE_CONVERT: <span class="Delimiter">{</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Normal">const</span> recipe& caller = get<span class="Delimiter">(</span><span class="Special">Recipe</span><span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L89" class="LineNr"> 89 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L90" class="LineNr"> 90 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"'maybe-convert' expects exactly 2 ingredients in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L91" class="LineNr"> 91 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L92" class="LineNr"> 92 </span> <span class="Delimiter">}</span>
<span id="L93" class="LineNr"> 93 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> base = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L94" class="LineNr"> 94 </span> <span class="Comment">// Update MAYBE_CONVERT base in Check</span>
<span id="L95" class="LineNr"> 95 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!base<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L96" class="LineNr"> 96 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"first ingredient of 'maybe-convert' should be an exclusive-container, but got '"</span> << base<span class="Delimiter">.</span>original_string << <span class="Constant">"'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L97" class="LineNr"> 97 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L98" class="LineNr"> 98 </span> <span class="Delimiter">}</span>
<span id="L99" class="LineNr"> 99 </span> <span class="Normal">const</span> type_tree* base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
<span id="L100" class="LineNr">100 </span> <span class="Comment">// Update MAYBE_CONVERT base_type in Check</span>
<span id="L101" class="LineNr">101 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!base_type<span class="Delimiter">-></span>atom || base_type<span class="Delimiter">-></span>value == <span class="Constant">0</span> || !contains_key<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> base_type<span class="Delimiter">-></span>value<span class="Delimiter">)</span> || get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> base_type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>kind != <a href='010vm.cc.html#L181'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L102" class="LineNr">102 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"first ingredient of 'maybe-convert' should be an exclusive-container, but got '"</span> << base<span class="Delimiter">.</span>original_string << <span class="Constant">"'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L103" class="LineNr">103 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L104" class="LineNr">104 </span> <span class="Delimiter">}</span>
<span id="L105" class="LineNr">105 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
<span id="L106" class="LineNr">106 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"second ingredient of 'maybe-convert' should have type 'variant', but got '"</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string << <span class="Constant">"'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L107" class="LineNr">107 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L108" class="LineNr">108 </span> <span class="Delimiter">}</span>
<span id="L109" class="LineNr">109 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L110" class="LineNr">110 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L111" class="LineNr">111 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"'maybe-convert' expects exactly 2 products in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L112" class="LineNr">112 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L113" class="LineNr">113 </span> <span class="Delimiter">}</span>
<span id="L114" class="LineNr">114 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L115" class="LineNr">115 </span> <span class="Comment">// Update MAYBE_CONVERT product in Check</span>
<span id="L116" class="LineNr">116 </span> reagent& offset = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L117" class="LineNr">117 </span> <a href='012transform.cc.html#L91'>populate_value</a><span class="Delimiter">(</span>offset<span class="Delimiter">);</span>
<span id="L118" class="LineNr">118 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>offset<span class="Delimiter">.</span>value >= <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> base_type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L119" class="LineNr">119 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"invalid tag "</span> << offset<span class="Delimiter">.</span>value << <span class="Constant">" in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L120" class="LineNr">120 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L121" class="LineNr">121 </span> <span class="Delimiter">}</span>
<span id="L122" class="LineNr">122 </span> <span class="Normal">const</span> reagent& variant = variant_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> offset<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
<span id="L123" class="LineNr">123 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>product<span class="Delimiter">,</span> variant<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L124" class="LineNr">124 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"'maybe-convert "</span> << base<span class="Delimiter">.</span>original_string << <span class="Constant">", "</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string << <span class="Constant">"' should write to "</span> << <a href='028call_return.cc.html#L163'>to_string</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="Constant">" but '"</span> << product<span class="Delimiter">.</span>name << <span class="Constant">"' has type "</span> << <a href='028call_return.cc.html#L163'>to_string</a><span class="Delimiter">(</span>product<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L125" class="LineNr">125 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L126" class="LineNr">126 </span> <span class="Delimiter">}</span>
<span id="L127" class="LineNr">127 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> status = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L128" class="LineNr">128 </span> <span class="Comment">// Update MAYBE_CONVERT status in Check</span>
<span id="L129" class="LineNr">129 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_boolean<span class="Delimiter">(</span>status<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L130" class="LineNr">130 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span><span class="Special">Recipe</span><span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"second product yielded by 'maybe-convert' should be a boolean, but tried to write to '"</span> << inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string << <span class="Constant">"'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L131" class="LineNr">131 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L132" class="LineNr">132 </span> <span class="Delimiter">}</span>
<span id="L133" class="LineNr">133 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L134" class="LineNr">134 </span><span class="Delimiter">}</span>
<span id="L135" class="LineNr">135 </span><span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span id="L136" class="LineNr">136 </span><span class="Normal">case</span> MAYBE_CONVERT: <span class="Delimiter">{</span>
<span id="L137" class="LineNr">137 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> base = <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L138" class="LineNr">138 </span> <span class="Comment">// Update MAYBE_CONVERT base in Run</span>
<span id="L139" class="LineNr">139 </span> <span class="Normal">int</span> base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
<span id="L140" class="LineNr">140 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L141" class="LineNr">141 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span><a href='026call.cc.html#L87'>current_recipe_name</a><span class="Delimiter">())</span> << <span class="Constant">"tried to access location 0 in '"</span> << to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> << <span class="Constant">"'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L142" class="LineNr">142 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L143" class="LineNr">143 </span> <span class="Delimiter">}</span>
<span id="L144" class="LineNr">144 </span> <span class="Normal">int</span> tag = <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>value<span class="Delimiter">;</span>
<span id="L145" class="LineNr">145 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L146" class="LineNr">146 </span> <span class="Comment">// Update MAYBE_CONVERT product in Run</span>
<span id="L147" class="LineNr">147 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> status = <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L148" class="LineNr">148 </span> <span class="Comment">// Update MAYBE_CONVERT status in Run</span>
<span id="L149" class="LineNr">149 </span> <span class="Comment">// optimization: directly write results to only update first product when necessary</span>
<span id="L150" class="LineNr">150 </span> write_products =<span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L151" class="LineNr">151 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>tag == <span class="Normal">static_cast</span><<span class="Normal">int</span>><span class="Delimiter">(</span><a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span><span class="Special">Memory</span><span class="Delimiter">,</span> base_address<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
<span id="L152" class="LineNr">152 </span> <span class="Normal">const</span> reagent& variant = variant_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> tag<span class="Delimiter">);</span>
<span id="L153" class="LineNr">153 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">"mem"</span><span class="Delimiter">)</span> << <span class="Constant">"storing 1 in location "</span> << status<span class="Delimiter">.</span>value << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L154" class="LineNr">154 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span><span class="Special">Memory</span><span class="Delimiter">,</span> status<span class="Delimiter">.</span>value<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L155" class="LineNr">155 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_dummy<span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L156" class="LineNr">156 </span> <span class="Comment">// Write Memory in Successful MAYBE_CONVERT in Run</span>
<span id="L157" class="LineNr">157 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < size_of<span class="Delimiter">(</span>variant<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L158" class="LineNr">158 </span> <span class="Normal">double</span> val = <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span><span class="Special">Memory</span><span class="Delimiter">,</span> base_address+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span>+i<span class="Delimiter">);</span>
<span id="L159" class="LineNr">159 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">"mem"</span><span class="Delimiter">)</span> << <span class="Constant">"storing "</span> << no_scientific<span class="Delimiter">(</span>val<span class="Delimiter">)</span> << <span class="Constant">" in location "</span> << product<span class="Delimiter">.</span>value+i << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L160" class="LineNr">160 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span><span class="Special">Memory</span><span class="Delimiter">,</span> product<span class="Delimiter">.</span>value+i<span class="Delimiter">,</span> val<span class="Delimiter">);</span>
<span id="L161" class="LineNr">161 </span> <span class="Delimiter">}</span>
<span id="L162" class="LineNr">162 </span> <span class="Delimiter">}</span>
<span id="L163" class="LineNr">163 </span> <span class="Delimiter">}</span>
<span id="L164" class="LineNr">164 </span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L165" class="LineNr">165 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">"mem"</span><span class="Delimiter">)</span> << <span class="Constant">"storing 0 in location "</span> << status<span class="Delimiter">.</span>value << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L166" class="LineNr">166 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span><span class="Special">Memory</span><span class="Delimiter">,</span> status<span class="Delimiter">.</span>value<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L167" class="LineNr">167 </span> <span class="Delimiter">}</span>
<span id="L168" class="LineNr">168 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L169" class="LineNr">169 </span><span class="Delimiter">}</span>
<span id="L170" class="LineNr">170 </span>
<span id="L171" class="LineNr">171 </span><span class="Delimiter">:(code)</span>
<span id="L172" class="LineNr">172 </span><span class="Normal">const</span> reagent variant_type<span class="Delimiter">(</span><span class="Normal">const</span> reagent& base<span class="Delimiter">,</span> <span class="Normal">int</span> tag<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L173" class="LineNr">173 </span> <span class="Identifier">return</span> variant_type<span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">,</span> tag<span class="Delimiter">);</span>
<span id="L174" class="LineNr">174 </span><span class="Delimiter">}</span>
<span id="L175" class="LineNr">175 </span>
<span id="L176" class="LineNr">176 </span><span class="Normal">const</span> reagent variant_type<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">,</span> <span class="Normal">int</span> tag<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L177" class="LineNr">177 </span> assert<span class="Delimiter">(</span>tag >= <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L178" class="LineNr">178 </span> <span class="Normal">const</span> type_tree* root_type = type<span class="Delimiter">-></span>atom ? type : type<span class="Delimiter">-></span>left<span class="Delimiter">;</span>
<span id="L179" class="LineNr">179 </span> assert<span class="Delimiter">(</span><a href='001help.cc.html#L226'>contains_key</a><span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> root_type<span class="Delimiter">-></span>value<span class="Delimiter">));</span>
<span id="L180" class="LineNr">180 </span> assert<span class="Delimiter">(</span>!get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> root_type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
<span id="L181" class="LineNr">181 </span> <span class="Normal">const</span> type_info& info = get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> root_type<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span id="L182" class="LineNr">182 </span> assert<span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind == <a href='010vm.cc.html#L181'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">);</span>
<span id="L183" class="LineNr">183 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>tag<span class="Delimiter">);</span>
<span id="L184" class="LineNr">184 </span> <span class="Comment">// End variant_type Special-cases</span>
<span id="L185" class="LineNr">185 </span> <span class="Identifier">return</span> element<span class="Delimiter">;</span>
<span id="L186" class="LineNr">186 </span><span class="Delimiter">}</span>
<span id="L187" class="LineNr">187 </span>
<span id="L188" class="LineNr">188 </span><span class="Delimiter">:(scenario maybe_convert_product_type_mismatch)</span>
<span id="L189" class="LineNr">189 </span><span class="Special">% Hide_errors = true;</span>
<span id="L190" class="LineNr">190 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L191" class="LineNr">191 </span> <span class="Constant">12</span>:num<span class="Special"> <- </span>copy <span class="Constant">1</span>
<span id="L192" class="LineNr">192 </span> <span class="Constant">13</span>:num<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span id="L193" class="LineNr">193 </span> <span class="Constant">14</span>:num<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span id="L194" class="LineNr">194 </span> <span class="Constant">20</span>:num<span class="Delimiter">,</span> <span class="Constant">21</span>:<span class="Normal">bool</span><span class="Special"> <- </span>maybe-convert <span class="Constant">12</span>:number-<span class="Normal">or</span>-point/unsafe<span class="Delimiter">,</span> <span class="Constant">1:variant</span>
<span id="L195" class="LineNr">195 </span>]
<span id="L196" class="LineNr">196 </span><span class="traceContains">+error: <a href='000organization.cc.html#L113'>main</a>: 'maybe-convert 12:number-or-point/unsafe, 1:variant' should write to point but '20' has type number</span>
<span id="L197" class="LineNr">197 </span>
<span id="L198" class="LineNr">198 </span><span class="Delimiter">:(scenario maybe_convert_dummy_product)</span>
<span id="L199" class="LineNr">199 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L200" class="LineNr">200 </span> <span class="Constant">12</span>:num<span class="Special"> <- </span>copy <span class="Constant">1</span>
<span id="L201" class="LineNr">201 </span> <span class="Constant">13</span>:num<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span id="L202" class="LineNr">202 </span> <span class="Constant">14</span>:num<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span id="L203" class="LineNr">203 </span> _<span class="Delimiter">,</span> <span class="Constant">21</span>:<span class="Normal">bool</span><span class="Special"> <- </span>maybe-convert <span class="Constant">12</span>:number-<span class="Normal">or</span>-point/unsafe<span class="Delimiter">,</span> <span class="Constant">1:variant</span>
<span id="L204" class="LineNr">204 </span>]
<span id="L205" class="LineNr">205 </span>$error: <span class="Constant">0</span>
<span id="L206" class="LineNr">206 </span>
<span id="L207" class="LineNr">207 </span><span class="SalientComment">//:: Allow exclusive containers to be defined in Mu code.</span>
<span id="L208" class="LineNr">208 </span>
<span id="L209" class="LineNr">209 </span><span class="Delimiter">:(scenario exclusive_container)</span>
<span id="L210" class="LineNr">210 </span><span class="muData">exclusive-container</span> foo [
<span id="L211" class="LineNr">211 </span> <span class="Normal">x</span>:num
<span id="L212" class="LineNr">212 </span> <span class="Normal">y</span>:num
<span id="L213" class="LineNr">213 </span>]
<span id="L214" class="LineNr">214 </span><span class="traceContains">+parse: --- defining exclusive-container foo</span>
<span id="L215" class="LineNr">215 </span><span class="traceContains">+parse: element: {x: "number"}</span>
<span id="L216" class="LineNr">216 </span><span class="traceContains">+parse: element: {y: "number"}</span>
<span id="L217" class="LineNr">217 </span>
<span id="L218" class="LineNr">218 </span><span class="Delimiter">:(before "End Command Handlers")</span>
<span id="L219" class="LineNr">219 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">"exclusive-container"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L220" class="LineNr">220 </span> <a href='030container.cc.html#L446'>insert_container</a><span class="Delimiter">(</span>command<span class="Delimiter">,</span> <a href='010vm.cc.html#L181'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">,</span> in<span class="Delimiter">);</span>
<span id="L221" class="LineNr">221 </span><span class="Delimiter">}</span>
<span id="L222" class="LineNr">222 </span>
<span id="L223" class="LineNr">223 </span><span class="Comment">//: arrays are disallowed inside exclusive containers unless their length is</span>
<span id="L224" class="LineNr">224 </span><span class="Comment">//: fixed in advance</span>
<span id="L225" class="LineNr">225 </span>
<span id="L226" class="LineNr">226 </span><span class="Delimiter">:(scenario exclusive_container_contains_array)</span>
<span id="L227" class="LineNr">227 </span><span class="muData">exclusive-container</span> foo [
<span id="L228" class="LineNr">228 </span> <span class="Normal">x</span>:@:num:<span class="Constant">3</span>
<span id="L229" class="LineNr">229 </span>]
<span id="L230" class="LineNr">230 </span>$error: <span class="Constant">0</span>
<span id="L231" class="LineNr">231 </span>
<span id="L232" class="LineNr">232 </span><span class="Delimiter">:(scenario exclusive_container_disallows_dynamic_array_element)</span>
<span id="L233" class="LineNr">233 </span><span class="Special">% Hide_errors = true;</span>
<span id="L234" class="LineNr">234 </span><span class="muData">exclusive-container</span> foo [
<span id="L235" class="LineNr">235 </span> <span class="Normal">x</span>:@:num
<span id="L236" class="LineNr">236 </span>]
<span id="L237" class="LineNr">237 </span><span class="traceContains">+error: container 'foo' cannot determine size of element 'x'</span>
<span id="L238" class="LineNr">238 </span>
<span id="L239" class="LineNr">239 </span><span class="SalientComment">//:: To construct exclusive containers out of variant types, use 'merge'.</span>
<span id="L240" class="LineNr">240 </span><span class="Delimiter">:(scenario lift_to_exclusive_container)</span>
<span id="L241" class="LineNr">241 </span><span class="muData">exclusive-container</span> foo [
<span id="L242" class="LineNr">242 </span> <span class="Normal">x</span>:num
<span id="L243" class="LineNr">243 </span> <span class="Normal">y</span>:num
<span id="L244" class="LineNr">244 </span>]
<span id="L245" class="LineNr">245 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L246" class="LineNr">246 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L247" class="LineNr">247 </span> <span class="Constant">2</span>:foo<span class="Special"> <- </span>merge <span class="Constant">0</span>/x<span class="Delimiter">,</span> <span class="Constant">1</span>:num <span class="Comment"># tag must be a literal when merging exclusive containers</span>
<span id="L248" class="LineNr">248 </span> <span class="Constant">4</span>:foo<span class="Special"> <- </span>merge <span class="Constant">1</span>/y<span class="Delimiter">,</span> <span class="Constant">1</span>:num
<span id="L249" class="LineNr">249 </span>]
<span id="L250" class="LineNr">250 </span><span class="traceContains">+mem: storing 0 in location 2</span>
<span id="L251" class="LineNr">251 </span><span class="traceContains">+mem: storing 34 in location 3</span>
<span id="L252" class="LineNr">252 </span><span class="traceContains">+mem: storing 1 in location 4</span>
<span id="L253" class="LineNr">253 </span><span class="traceContains">+mem: storing 34 in location 5</span>
<span id="L254" class="LineNr">254 </span>
<span id="L255" class="LineNr">255 </span><span class="Comment">//: type-checking for 'merge' on exclusive containers</span>
<span id="L256" class="LineNr">256 </span>
<span id="L257" class="LineNr">257 </span><span class="Delimiter">:(scenario merge_handles_exclusive_container)</span>
<span id="L258" class="LineNr">258 </span><span class="muData">exclusive-container</span> foo [
<span id="L259" class="LineNr">259 </span> <span class="Normal">x</span>:num
<span id="L260" class="LineNr">260 </span> <span class="Normal">y</span>:bar
<span id="L261" class="LineNr">261 </span>]
<span id="L262" class="LineNr">262 </span><span class="muData">container</span> bar [
<span id="L263" class="LineNr">263 </span> <span class="Normal">z</span>:num
<span id="L264" class="LineNr">264 </span>]
<span id="L265" class="LineNr">265 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L266" class="LineNr">266 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">0</span>/x<span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L267" class="LineNr">267 </span>]
<span id="L268" class="LineNr">268 </span><span class="traceContains">+mem: storing 0 in location 1</span>
<span id="L269" class="LineNr">269 </span><span class="traceContains">+mem: storing 34 in location 2</span>
<span id="L270" class="LineNr">270 </span>$error: <span class="Constant">0</span>
<span id="L271" class="LineNr">271 </span>
<span id="L272" class="LineNr">272 </span><span class="Delimiter">:(scenario merge_requires_literal_tag_for_exclusive_container)</span>
<span id="L273" class="LineNr">273 </span><span class="Special">% Hide_errors = true;</span>
<span id="L274" class="LineNr">274 </span><span class="muData">exclusive-container</span> foo [
<span id="L275" class="LineNr">275 </span> <span class="Normal">x</span>:num
<span id="L276" class="LineNr">276 </span> <span class="Normal">y</span>:bar
<span id="L277" class="LineNr">277 </span>]
<span id="L278" class="LineNr">278 </span><span class="muData">container</span> bar [
<span id="L279" class="LineNr">279 </span> <span class="Normal">z</span>:num
<span id="L280" class="LineNr">280 </span>]
<span id="L281" class="LineNr">281 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L282" class="LineNr">282 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span id="L283" class="LineNr">283 </span> <span class="Constant">2</span>:foo<span class="Special"> <- </span>merge <span class="Constant">1</span>:num<span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L284" class="LineNr">284 </span>]
<span id="L285" class="LineNr">285 </span><span class="traceContains">+error: <a href='000organization.cc.html#L113'>main</a>: ingredient 0 of 'merge' should be a literal, for the tag of exclusive-container 'foo' in '2:foo <- merge 1:num, 34'</span>
<span id="L286" class="LineNr">286 </span>
<span id="L287" class="LineNr">287 </span><span class="Delimiter">:(scenario merge_handles_exclusive_container_inside_exclusive_container)</span>
<span id="L288" class="LineNr">288 </span><span class="muData">exclusive-container</span> foo [
<span id="L289" class="LineNr">289 </span> <span class="Normal">x</span>:num
<span id="L290" class="LineNr">290 </span> <span class="Normal">y</span>:bar
<span id="L291" class="LineNr">291 </span>]
<span id="L292" class="LineNr">292 </span><span class="muData">exclusive-container</span> bar [
<span id="L293" class="LineNr">293 </span> <span class="Normal">a</span>:num
<span id="L294" class="LineNr">294 </span> <span class="Normal">b</span>:num
<span id="L295" class="LineNr">295 </span>]
<span id="L296" class="LineNr">296 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L297" class="LineNr">297 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span id="L298" class="LineNr">298 </span> <span class="Constant">2</span>:bar<span class="Special"> <- </span>merge <span class="Constant">0</span>/a<span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L299" class="LineNr">299 </span> <span class="Constant">4</span>:foo<span class="Special"> <- </span>merge <span class="Constant">1</span>/y<span class="Delimiter">,</span> <span class="Constant">2</span>:bar
<span id="L300" class="LineNr">300 </span>]
<span id="L301" class="LineNr">301 </span><span class="traceContains">+mem: storing 0 in location 5</span>
<span id="L302" class="LineNr">302 </span><span class="traceContains">+mem: storing 34 in location 6</span>
<span id="L303" class="LineNr">303 </span>$error: <span class="Constant">0</span>
<span id="L304" class="LineNr">304 </span>
<span id="L305" class="LineNr">305 </span><span class="Delimiter">:(before "End <a href='031merge.cc.html#L142'>check_merge_call</a> Special-cases")</span>
<span id="L306" class="LineNr">306 </span><span class="Normal">case</span> <a href='010vm.cc.html#L181'>EXCLUSIVE_CONTAINER</a>: <span class="Delimiter">{</span>
<span id="L307" class="LineNr">307 </span> assert<span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index == <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L308" class="LineNr">308 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"checking exclusive container "</span> << <a href='028call_return.cc.html#L163'>to_string</a><span class="Delimiter">(</span>container<span class="Delimiter">)</span> << <span class="Constant">" vs ingredient "</span> << ingredient_index << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L309" class="LineNr">309 </span> <span class="Comment">// easy case: exact match</span>
<span id="L310" class="LineNr">310 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>types_strictly_match<span class="Delimiter">(</span>container<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span>
<span id="L311" class="LineNr">311 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L312" class="LineNr">312 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
<span id="L313" class="LineNr">313 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"ingredient "</span> << ingredient_index << <span class="Constant">" of 'merge' should be a literal, for the tag of exclusive-container '"</span> << container_info<span class="Delimiter">.</span>name << <span class="Constant">"' in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L314" class="LineNr">314 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L315" class="LineNr">315 </span> <span class="Delimiter">}</span>
<span id="L316" class="LineNr">316 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> ingredient = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">);</span> <span class="Comment">// unnecessary copy just to keep this function from modifying caller</span>
<span id="L317" class="LineNr">317 </span> <a href='012transform.cc.html#L91'>populate_value</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
<span id="L318" class="LineNr">318 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient<span class="Delimiter">.</span>value >= <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>container_info<span class="Delimiter">.</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L319" class="LineNr">319 </span> <a href='003trace.cc.html#L196'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"invalid tag at "</span> << ingredient_index << <span class="Constant">" for '"</span> << container_info<span class="Delimiter">.</span>name << <span class="Constant">"' in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L320" class="LineNr">320 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L321" class="LineNr">321 </span> <span class="Delimiter">}</span>
<span id="L322" class="LineNr">322 </span> <span class="Normal">const</span> reagent& variant = variant_type<span class="Delimiter">(</span>container<span class="Delimiter">,</span> ingredient<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
<span id="L323" class="LineNr">323 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"tag: "</span> << ingredient<span class="Delimiter">.</span>value << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L324" class="LineNr">324 </span> <span class="Comment">// replace union with its variant</span>
<span id="L325" class="LineNr">325 </span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
<span id="L326" class="LineNr">326 </span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>push<span class="Delimiter">(</span>merge_check_point<span class="Delimiter">(</span>variant<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">));</span>
<span id="L327" class="LineNr">327 </span> ++ingredient_index<span class="Delimiter">;</span>
<span id="L328" class="LineNr">328 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L329" class="LineNr">329 </span><span class="Delimiter">}</span>
<span id="L330" class="LineNr">330 </span>
<span id="L331" class="LineNr">331 </span><span class="Delimiter">:(scenario merge_check_container_containing_exclusive_container)</span>
<span id="L332" class="LineNr">332 </span><span class="muData">container</span> foo [
<span id="L333" class="LineNr">333 </span> <span class="Normal">x</span>:num
<span id="L334" class="LineNr">334 </span> <span class="Normal">y</span>:bar
<span id="L335" class="LineNr">335 </span>]
<span id="L336" class="LineNr">336 </span><span class="muData">exclusive-container</span> bar [
<span id="L337" class="LineNr">337 </span> <span class="Normal">x</span>:num
<span id="L338" class="LineNr">338 </span> <span class="Normal">y</span>:num
<span id="L339" class="LineNr">339 </span>]
<span id="L340" class="LineNr">340 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L341" class="LineNr">341 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">23</span><span class="Delimiter">,</span> <span class="Constant">1</span>/y<span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L342" class="LineNr">342 </span>]
<span id="L343" class="LineNr">343 </span><span class="traceContains">+mem: storing 23 in location 1</span>
<span id="L344" class="LineNr">344 </span><span class="traceContains">+mem: storing 1 in location 2</span>
<span id="L345" class="LineNr">345 </span><span class="traceContains">+mem: storing 34 in location 3</span>
<span id="L346" class="LineNr">346 </span>$error: <span class="Constant">0</span>
<span id="L347" class="LineNr">347 </span>
<span id="L348" class="LineNr">348 </span><span class="Delimiter">:(scenario merge_check_container_containing_exclusive_container_2)</span>
<span id="L349" class="LineNr">349 </span><span class="Special">% Hide_errors = true;</span>
<span id="L350" class="LineNr">350 </span><span class="muData">container</span> foo [
<span id="L351" class="LineNr">351 </span> <span class="Normal">x</span>:num
<span id="L352" class="LineNr">352 </span> <span class="Normal">y</span>:bar
<span id="L353" class="LineNr">353 </span>]
<span id="L354" class="LineNr">354 </span><span class="muData">exclusive-container</span> bar [
<span id="L355" class="LineNr">355 </span> <span class="Normal">x</span>:num
<span id="L356" class="LineNr">356 </span> <span class="Normal">y</span>:num
<span id="L357" class="LineNr">357 </span>]
<span id="L358" class="LineNr">358 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L359" class="LineNr">359 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">23</span><span class="Delimiter">,</span> <span class="Constant">1</span>/y<span class="Delimiter">,</span> <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span>
<span id="L360" class="LineNr">360 </span>]
<span id="L361" class="LineNr">361 </span><span class="traceContains">+error: <a href='000organization.cc.html#L113'>main</a>: too many ingredients in '1:foo <- merge 23, 1/y, 34, 35'</span>
<span id="L362" class="LineNr">362 </span>
<span id="L363" class="LineNr">363 </span><span class="Delimiter">:(scenario merge_check_exclusive_container_containing_container)</span>
<span id="L364" class="LineNr">364 </span><span class="muData">exclusive-container</span> foo [
<span id="L365" class="LineNr">365 </span> <span class="Normal">x</span>:num
<span id="L366" class="LineNr">366 </span> <span class="Normal">y</span>:bar
<span id="L367" class="LineNr">367 </span>]
<span id="L368" class="LineNr">368 </span><span class="muData">container</span> bar [
<span id="L369" class="LineNr">369 </span> <span class="Normal">x</span>:num
<span id="L370" class="LineNr">370 </span> <span class="Normal">y</span>:num
<span id="L371" class="LineNr">371 </span>]
<span id="L372" class="LineNr">372 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L373" class="LineNr">373 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">1</span>/y<span class="Delimiter">,</span> <span class="Constant">23</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L374" class="LineNr">374 </span>]
<span id="L375" class="LineNr">375 </span><span class="traceContains">+mem: storing 1 in location 1</span>
<span id="L376" class="LineNr">376 </span><span class="traceContains">+mem: storing 23 in location 2</span>
<span id="L377" class="LineNr">377 </span><span class="traceContains">+mem: storing 34 in location 3</span>
<span id="L378" class="LineNr">378 </span>$error: <span class="Constant">0</span>
<span id="L379" class="LineNr">379 </span>
<span id="L380" class="LineNr">380 </span><span class="Delimiter">:(scenario merge_check_exclusive_container_containing_container_2)</span>
<span id="L381" class="LineNr">381 </span><span class="muData">exclusive-container</span> foo [
<span id="L382" class="LineNr">382 </span> <span class="Normal">x</span>:num
<span id="L383" class="LineNr">383 </span> <span class="Normal">y</span>:bar
<span id="L384" class="LineNr">384 </span>]
<span id="L385" class="LineNr">385 </span><span class="muData">container</span> bar [
<span id="L386" class="LineNr">386 </span> <span class="Normal">x</span>:num
<span id="L387" class="LineNr">387 </span> <span class="Normal">y</span>:num
<span id="L388" class="LineNr">388 </span>]
<span id="L389" class="LineNr">389 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L390" class="LineNr">390 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">0</span>/x<span class="Delimiter">,</span> <span class="Constant">23</span>
<span id="L391" class="LineNr">391 </span>]
<span id="L392" class="LineNr">392 </span>$error: <span class="Constant">0</span>
<span id="L393" class="LineNr">393 </span>
<span id="L394" class="LineNr">394 </span><span class="Delimiter">:(scenario merge_check_exclusive_container_containing_container_3)</span>
<span id="L395" class="LineNr">395 </span><span class="Special">% Hide_errors = true;</span>
<span id="L396" class="LineNr">396 </span><span class="muData">exclusive-container</span> foo [
<span id="L397" class="LineNr">397 </span> <span class="Normal">x</span>:num
<span id="L398" class="LineNr">398 </span> <span class="Normal">y</span>:bar
<span id="L399" class="LineNr">399 </span>]
<span id="L400" class="LineNr">400 </span><span class="muData">container</span> bar [
<span id="L401" class="LineNr">401 </span> <span class="Normal">x</span>:num
<span id="L402" class="LineNr">402 </span> <span class="Normal">y</span>:num
<span id="L403" class="LineNr">403 </span>]
<span id="L404" class="LineNr">404 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L405" class="LineNr">405 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">1</span>/y<span class="Delimiter">,</span> <span class="Constant">23</span>
<span id="L406" class="LineNr">406 </span>]
<span id="L407" class="LineNr">407 </span><span class="traceContains">+error: <a href='000organization.cc.html#L113'>main</a>: too few ingredients in '1:foo <- merge 1/y, 23'</span>
<span id="L408" class="LineNr">408 </span>
<span id="L409" class="LineNr">409 </span><span class="Delimiter">:(scenario merge_check_exclusive_container_containing_container_4)</span>
<span id="L410" class="LineNr">410 </span><span class="muData">exclusive-container</span> foo [
<span id="L411" class="LineNr">411 </span> <span class="Normal">x</span>:num
<span id="L412" class="LineNr">412 </span> <span class="Normal">y</span>:bar
<span id="L413" class="LineNr">413 </span>]
<span id="L414" class="LineNr">414 </span><span class="muData">container</span> bar [
<span id="L415" class="LineNr">415 </span> <span class="Normal">a</span>:num
<span id="L416" class="LineNr">416 </span> <span class="Normal">b</span>:num
<span id="L417" class="LineNr">417 </span>]
<span id="L418" class="LineNr">418 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L419" class="LineNr">419 </span> <span class="Constant">1</span>:bar<span class="Special"> <- </span>merge <span class="Constant">23</span><span class="Delimiter">,</span> <span class="Constant">24</span>
<span id="L420" class="LineNr">420 </span> <span class="Constant">3</span>:foo<span class="Special"> <- </span>merge <span class="Constant">1</span>/y<span class="Delimiter">,</span> <span class="Constant">1</span>:bar
<span id="L421" class="LineNr">421 </span>]
<span id="L422" class="LineNr">422 </span>$error: <span class="Constant">0</span>
<span id="L423" class="LineNr">423 </span>
<span id="L424" class="LineNr">424 </span><span class="Comment">//: Since the different variants of an exclusive-container might have</span>
<span id="L425" class="LineNr">425 </span><span class="Comment">//: different sizes, relax the size mismatch check for 'merge' instructions.</span>
<span id="L426" class="LineNr">426 </span><span class="Delimiter">:(before "End size_mismatch(x) Special-cases")</span>
<span id="L427" class="LineNr">427 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='026call.cc.html#L84'>current_step_index</a><span class="Delimiter">()</span> < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span><span class="Special">Current_routine</span><span class="Delimiter">-></span>steps<span class="Delimiter">())</span>
<span id="L428" class="LineNr">428 </span> && <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>operation == MERGE
<span id="L429" class="LineNr">429 </span> && !current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span>
<span id="L430" class="LineNr">430 </span> && <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L431" class="LineNr">431 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> x = <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L432" class="LineNr">432 </span> <span class="Comment">// Update size_mismatch Check for MERGE(x)</span>
<span id="L433" class="LineNr">433 </span> <span class="Normal">const</span> type_tree* root_type = x<span class="Delimiter">.</span>type<span class="Delimiter">-></span>atom ? x<span class="Delimiter">.</span>type : x<span class="Delimiter">.</span>type<span class="Delimiter">-></span>left<span class="Delimiter">;</span>
<span id="L434" class="LineNr">434 </span> assert<span class="Delimiter">(</span>root_type<span class="Delimiter">-></span>atom<span class="Delimiter">);</span>
<span id="L435" class="LineNr">435 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> root_type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>kind == <a href='010vm.cc.html#L181'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">)</span>
<span id="L436" class="LineNr">436 </span> <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>x<span class="Delimiter">)</span> < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>data<span class="Delimiter">);</span>
<span id="L437" class="LineNr">437 </span><span class="Delimiter">}</span>
<span id="L438" class="LineNr">438 </span>
<span id="L439" class="LineNr">439 </span><span class="Delimiter">:(scenario merge_exclusive_container_with_mismatched_sizes)</span>
<span id="L440" class="LineNr">440 </span><span class="muData">container</span> foo [
<span id="L441" class="LineNr">441 </span> <span class="Normal">x</span>:num
<span id="L442" class="LineNr">442 </span> <span class="Normal">y</span>:num
<span id="L443" class="LineNr">443 </span>]
<span id="L444" class="LineNr">444 </span><span class="muData">exclusive-container</span> bar [
<span id="L445" class="LineNr">445 </span> <span class="Normal">x</span>:num
<span id="L446" class="LineNr">446 </span> <span class="Normal">y</span>:foo
<span id="L447" class="LineNr">447 </span>]
<span id="L448" class="LineNr">448 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L449" class="LineNr">449 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L450" class="LineNr">450 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span id="L451" class="LineNr">451 </span> <span class="Constant">3</span>:bar<span class="Special"> <- </span>merge <span class="Constant">0</span>/x<span class="Delimiter">,</span> <span class="Constant">1</span>:num
<span id="L452" class="LineNr">452 </span> <span class="Constant">6</span>:bar<span class="Special"> <- </span>merge <span class="Constant">1</span>/foo<span class="Delimiter">,</span> <span class="Constant">1</span>:num<span class="Delimiter">,</span> <span class="Constant">2</span>:num
<span id="L453" class="LineNr">453 </span>]
<span id="L454" class="LineNr">454 </span><span class="traceContains">+mem: storing 0 in location 3</span>
<span id="L455" class="LineNr">455 </span><span class="traceContains">+mem: storing 34 in location 4</span>
<span id="L456" class="LineNr">456 </span><span class="Comment"># bar is always 3 large so location 5 is skipped</span>
<span id="L457" class="LineNr">457 </span><span class="traceContains">+mem: storing 1 in location 6</span>
<span id="L458" class="LineNr">458 </span><span class="traceContains">+mem: storing 34 in location 7</span>
<span id="L459" class="LineNr">459 </span><span class="traceContains">+mem: storing 35 in location 8</span>
</pre>
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