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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>Mu - 069hash.cc</title>
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<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="cpp">
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a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.CommentedCode { color: #8a8a8a; }
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<a href='https://github.com/akkartik/mu/blob/master/069hash.cc'>https://github.com/akkartik/mu/blob/master/069hash.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">// Compute a hash for objects of any type.</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">// The way it's currently implemented, two objects will have the same hash if</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">// all their non-address fields (all the way down) expand to the same sequence</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">// of scalar values. In particular, a container with all zero addresses hashes</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment">// to 0. Hopefully this won't be an issue because we are usually hashing</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment">// objects of a single type in any given hash table.</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment">//</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment">// Based on <a href="http://burtleburtle.net/bob/hash/hashfaq.html">http://burtleburtle.net/bob/hash/hashfaq.html</a></span>
<span id="L10" class="LineNr"> 10 </span>
<span id="L11" class="LineNr"> 11 </span><span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
<span id="L12" class="LineNr"> 12 </span>HASH<span class="Delimiter">,</span>
<span id="L13" class="LineNr"> 13 </span><span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
<span id="L14" class="LineNr"> 14 </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">"hash"</span><span class="Delimiter">,</span> HASH<span class="Delimiter">);</span>
<span id="L15" class="LineNr"> 15 </span><span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
<span id="L16" class="LineNr"> 16 </span><span class="Normal">case</span> HASH: <span class="Delimiter">{</span>
<span id="L17" class="LineNr"> 17 </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">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L18" class="LineNr"> 18 </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">"'hash' takes exactly one ingredient rather than '"</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="L19" class="LineNr"> 19 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L20" class="LineNr"> 20 </span> <span class="Delimiter">}</span>
<span id="L21" class="LineNr"> 21 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L22" class="LineNr"> 22 </span><span class="Delimiter">}</span>
<span id="L23" class="LineNr"> 23 </span><span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span id="L24" class="LineNr"> 24 </span><span class="Normal">case</span> HASH: <span class="Delimiter">{</span>
<span id="L25" class="LineNr"> 25 </span> <span class="Normal">const</span> reagent& input = <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="L26" class="LineNr"> 26 </span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L27" class="LineNr"> 27 </span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> input<span class="Delimiter">));</span>
<span id="L28" class="LineNr"> 28 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L29" class="LineNr"> 29 </span><span class="Delimiter">}</span>
<span id="L30" class="LineNr"> 30 </span>
<span id="L31" class="LineNr"> 31 </span><span class="Comment">//: in all the code below, the intermediate results of hashing are threaded through 'h'</span>
<span id="L32" class="LineNr"> 32 </span>
<span id="L33" class="LineNr"> 33 </span><span class="Delimiter">:(code)</span>
<span id="L34" class="LineNr"> 34 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L35" class="LineNr"> 35 </span> <a href='035lookup.cc.html#L66'>canonize</a><span class="Delimiter">(</span>r<span class="Delimiter">);</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='027call_ingredient.cc.html#L179'>is_mu_text</a><span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Comment">// optimization</span>
<span id="L37" class="LineNr"> 37 </span> <span class="Identifier">return</span> <a href='069hash.cc.html#L64'>hash_mu_text</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L38" class="LineNr"> 38 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
<span id="L39" class="LineNr"> 39 </span> <span class="Identifier">return</span> <a href='069hash.cc.html#L56'>hash_mu_address</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L40" class="LineNr"> 40 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_scalar<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Identifier">return</span> <a href='069hash.cc.html#L51'>hash_mu_scalar</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Identifier">return</span> <a href='069hash.cc.html#L73'>hash_mu_array</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_container<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Identifier">return</span> <a href='069hash.cc.html#L87'>hash_mu_container</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_exclusive_container<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
<span id="L47" class="LineNr"> 47 </span> <span class="Identifier">return</span> <a href='069hash.cc.html#L102'>hash_mu_exclusive_container</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L48" class="LineNr"> 48 </span> assert<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
<span id="L49" class="LineNr"> 49 </span><span class="Delimiter">}</span>
<span id="L50" class="LineNr"> 50 </span>
<span id="L51" class="LineNr"> 51 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L51'>hash_mu_scalar</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> <span class="Normal">const</span> reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Normal">double</span> input = is_literal<span class="Delimiter">(</span>r<span class="Delimiter">)</span> ? r<span class="Delimiter">.</span>value : <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span><span class="Special">Memory</span><span class="Delimiter">,</span> r<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
<span id="L53" class="LineNr"> 53 </span> <span class="Identifier">return</span> <a href='069hash.cc.html#L115'>hash_iter</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> <span class="Normal">static_cast</span><<span class="Normal">size_t</span>><span class="Delimiter">(</span>input<span class="Delimiter">));</span>
<span id="L54" class="LineNr"> 54 </span><span class="Delimiter">}</span>
<span id="L55" class="LineNr"> 55 </span>
<span id="L56" class="LineNr"> 56 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L56'>hash_mu_address</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L57" class="LineNr"> 57 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L58" class="LineNr"> 58 </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">"location "</span> << r<span class="Delimiter">.</span>value << <span class="Constant">" is "</span> << no_scientific<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> r<span class="Delimiter">.</span>value<span class="Delimiter">))</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L59" class="LineNr"> 59 </span> r<span class="Delimiter">.</span><a href='010vm.cc.html#L67'>set_value</a><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> r<span class="Delimiter">.</span>value<span class="Delimiter">));</span>
<span id="L60" class="LineNr"> 60 </span> drop_from_type<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">"address"</span><span class="Delimiter">);</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Identifier">return</span> <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L62" class="LineNr"> 62 </span><span class="Delimiter">}</span>
<span id="L63" class="LineNr"> 63 </span>
<span id="L64" class="LineNr"> 64 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L64'>hash_mu_text</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> <span class="Normal">const</span> reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L65" class="LineNr"> 65 </span> string input = <a href='038new_text.cc.html#L142'>read_mu_text</a><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> r<span class="Delimiter">.</span>value+<span class="Comment">/*</span><span class="Comment">skip alloc id</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">));</span>
<span id="L66" class="LineNr"> 66 </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>input<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L67" class="LineNr"> 67 </span> h = <a href='069hash.cc.html#L115'>hash_iter</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> <span class="Normal">static_cast</span><<span class="Normal">size_t</span>><span class="Delimiter">(</span>input<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)));</span>
<span id="L68" class="LineNr"> 68 </span><span class="CommentedCode">//? cerr << i << ": " << h << '\n';</span>
<span id="L69" class="LineNr"> 69 </span> <span class="Delimiter">}</span>
<span id="L70" class="LineNr"> 70 </span> <span class="Identifier">return</span> h<span class="Delimiter">;</span>
<span id="L71" class="LineNr"> 71 </span><span class="Delimiter">}</span>
<span id="L72" class="LineNr"> 72 </span>
<span id="L73" class="LineNr"> 73 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L73'>hash_mu_array</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> <span class="Normal">const</span> reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Normal">int</span> size = <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span><span class="Special">Memory</span><span class="Delimiter">,</span> r<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
<span id="L75" class="LineNr"> 75 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> elem = r<span class="Delimiter">;</span>
<span id="L76" class="LineNr"> 76 </span> <span class="Normal">delete</span> elem<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
<span id="L77" class="LineNr"> 77 </span> elem<span class="Delimiter">.</span>type = <a href='032array.cc.html#L299'>copy_array_element</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
<span id="L78" class="LineNr"> 78 </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> <a href='043space.cc.html#L101'>address</a> = r<span class="Delimiter">.</span>value+<span class="Constant">1</span><span class="Delimiter">;</span> i < size<span class="Delimiter">;</span> ++i<span class="Delimiter">,</span> <a href='043space.cc.html#L101'>address</a> += size_of<span class="Delimiter">(</span>elem<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L79" class="LineNr"> 79 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> tmp = elem<span class="Delimiter">;</span>
<span id="L80" class="LineNr"> 80 </span> tmp<span class="Delimiter">.</span><a href='010vm.cc.html#L67'>set_value</a><span class="Delimiter">(</span><a href='043space.cc.html#L101'>address</a><span class="Delimiter">);</span>
<span id="L81" class="LineNr"> 81 </span> h = <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
<span id="L82" class="LineNr"> 82 </span><span class="CommentedCode">//? cerr << i << " (" << address << "): " << h << '\n';</span>
<span id="L83" class="LineNr"> 83 </span> <span class="Delimiter">}</span>
<span id="L84" class="LineNr"> 84 </span> <span class="Identifier">return</span> h<span class="Delimiter">;</span>
<span id="L85" class="LineNr"> 85 </span><span class="Delimiter">}</span>
<span id="L86" class="LineNr"> 86 </span>
<span id="L87" class="LineNr"> 87 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L87'>hash_mu_container</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> <span class="Normal">const</span> reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L88" class="LineNr"> 88 </span> type_info& info = get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> get_base_type<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">)-></span>value<span class="Delimiter">);</span>
<span id="L89" class="LineNr"> 89 </span> <span class="Normal">int</span> <a href='043space.cc.html#L101'>address</a> = r<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
<span id="L90" class="LineNr"> 90 </span> <span class="Normal">int</span> offset = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L91" class="LineNr"> 91 </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>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L92" class="LineNr"> 92 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = <a href='030container.cc.html#L212'>element_type</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">,</span> i<span class="Delimiter">);</span>
<span id="L93" class="LineNr"> 93 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>element<span class="Delimiter">,</span> <span class="Constant">"ignore-for-hash"</span><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L94" class="LineNr"> 94 </span> element<span class="Delimiter">.</span><a href='010vm.cc.html#L67'>set_value</a><span class="Delimiter">(</span>address+offset<span class="Delimiter">);</span>
<span id="L95" class="LineNr"> 95 </span> h = <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> element<span class="Delimiter">);</span>
<span id="L96" class="LineNr"> 96 </span><span class="CommentedCode">//? cerr << i << ": " << h << '\n';</span>
<span id="L97" class="LineNr"> 97 </span> offset += size_of<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
<span id="L98" class="LineNr"> 98 </span> <span class="Delimiter">}</span>
<span id="L99" class="LineNr"> 99 </span> <span class="Identifier">return</span> h<span class="Delimiter">;</span>
<span id="L100" class="LineNr">100 </span><span class="Delimiter">}</span>
<span id="L101" class="LineNr">101 </span>
<span id="L102" class="LineNr">102 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L102'>hash_mu_exclusive_container</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> <span class="Normal">const</span> reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L103" class="LineNr">103 </span> <span class="Normal">const</span> type_tree* type = get_base_type<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
<span id="L104" class="LineNr">104 </span> assert<span class="Delimiter">(</span>type<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span id="L105" class="LineNr">105 </span> <span class="Normal">int</span> tag = get<span class="Delimiter">(</span><span class="Special">Memory</span><span class="Delimiter">,</span> r<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
<span id="L106" class="LineNr">106 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> variant = variant_type<span class="Delimiter">(</span>r<span class="Delimiter">,</span> tag<span class="Delimiter">);</span>
<span id="L107" class="LineNr">107 </span> <span class="Comment">// todo: move this error to container definition time</span>
<span id="L108" class="LineNr">108 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>variant<span class="Delimiter">,</span> <span class="Constant">"ignore-for-hash"</span><span class="Delimiter">))</span>
<span id="L109" class="LineNr">109 </span> <a href='003trace.cc.html#L196'>raise</a> << get<span class="Delimiter">(</span><span class="Special">Type</span><span class="Delimiter">,</span> type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>name << <span class="Constant">": /ignore-for-hash won't work in exclusive containers\n"</span> << end<span class="Delimiter">();</span>
<span id="L110" class="LineNr">110 </span> variant<span class="Delimiter">.</span><a href='010vm.cc.html#L67'>set_value</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>value + <span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L111" class="LineNr">111 </span> h = <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> variant<span class="Delimiter">);</span>
<span id="L112" class="LineNr">112 </span> <span class="Identifier">return</span> h<span class="Delimiter">;</span>
<span id="L113" class="LineNr">113 </span><span class="Delimiter">}</span>
<span id="L114" class="LineNr">114 </span>
<span id="L115" class="LineNr">115 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L115'>hash_iter</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> <span class="Normal">size_t</span> input<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L116" class="LineNr">116 </span> h += input<span class="Delimiter">;</span>
<span id="L117" class="LineNr">117 </span> h += <span class="Delimiter">(</span>h<<<span class="Constant">10</span><span class="Delimiter">);</span>
<span id="L118" class="LineNr">118 </span> h ^= <span class="Delimiter">(</span>h>><span class="Constant">6</span><span class="Delimiter">);</span>
<span id="L119" class="LineNr">119 </span>
<span id="L120" class="LineNr">120 </span> h += <span class="Delimiter">(</span>h<<<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L121" class="LineNr">121 </span> h ^= <span class="Delimiter">(</span>h>><span class="Constant">11</span><span class="Delimiter">);</span>
<span id="L122" class="LineNr">122 </span> h += <span class="Delimiter">(</span>h<<<span class="Constant">15</span><span class="Delimiter">);</span>
<span id="L123" class="LineNr">123 </span> <span class="Identifier">return</span> h<span class="Delimiter">;</span>
<span id="L124" class="LineNr">124 </span><span class="Delimiter">}</span>
<span id="L125" class="LineNr">125 </span>
<span id="L126" class="LineNr">126 </span><span class="Delimiter">:(scenario hash_container_checks_all_elements)</span>
<span id="L127" class="LineNr">127 </span><span class="muData">container</span> foo [
<span id="L128" class="LineNr">128 </span> <span class="Normal">x</span>:num
<span id="L129" class="LineNr">129 </span> <span class="Normal">y</span>:<span class="Normal">char</span>
<span id="L130" class="LineNr">130 </span>]
<span id="L131" class="LineNr">131 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L132" class="LineNr">132 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">97</span>/a
<span id="L133" class="LineNr">133 </span> <span class="Constant">3</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>:foo
<span id="L134" class="LineNr">134 </span> <span class="Identifier">return</span>-unless <span class="Constant">3</span>:num
<span id="L135" class="LineNr">135 </span> <span class="Constant">4</span>:foo<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">98</span>/a
<span id="L136" class="LineNr">136 </span> <span class="Constant">6</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">4</span>:foo
<span id="L137" class="LineNr">137 </span> <span class="Identifier">return</span>-unless <span class="Constant">6</span>:num
<span id="L138" class="LineNr">138 </span> <span class="Constant">7</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">3</span>:num<span class="Delimiter">,</span> <span class="Constant">6</span>:num
<span id="L139" class="LineNr">139 </span>]
<span id="L140" class="LineNr">140 </span><span class="Comment"># hash on containers includes all elements</span>
<span id="L141" class="LineNr">141 </span><span class="traceContains">+mem: storing 0 in location 7</span>
<span id="L142" class="LineNr">142 </span>
<span id="L143" class="LineNr">143 </span><span class="Delimiter">:(scenario hash_exclusive_container_checks_all_elements)</span>
<span id="L144" class="LineNr">144 </span><span class="muData">exclusive-container</span> foo [
<span id="L145" class="LineNr">145 </span> <span class="Normal">x</span>:bar
<span id="L146" class="LineNr">146 </span> <span class="Normal">y</span>:num
<span id="L147" class="LineNr">147 </span>]
<span id="L148" class="LineNr">148 </span><span class="muData">container</span> bar [
<span id="L149" class="LineNr">149 </span> <span class="Normal">a</span>:num
<span id="L150" class="LineNr">150 </span> <span class="Normal">b</span>:num
<span id="L151" class="LineNr">151 </span>]
<span id="L152" class="LineNr">152 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L153" class="LineNr">153 </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 class="Delimiter">,</span> <span class="Constant">35</span>
<span id="L154" class="LineNr">154 </span> <span class="Constant">4</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>:foo
<span id="L155" class="LineNr">155 </span> <span class="Identifier">return</span>-unless <span class="Constant">4</span>:num
<span id="L156" class="LineNr">156 </span> <span class="Constant">5</span>:foo<span class="Special"> <- </span>merge <span class="Constant">0</span>/x<span class="Delimiter">,</span> <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">36</span>
<span id="L157" class="LineNr">157 </span> <span class="Constant">8</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">5</span>:foo
<span id="L158" class="LineNr">158 </span> <span class="Identifier">return</span>-unless <span class="Constant">8</span>:num
<span id="L159" class="LineNr">159 </span> <span class="Constant">9</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">4</span>:num<span class="Delimiter">,</span> <span class="Constant">8</span>:num
<span id="L160" class="LineNr">160 </span>]
<span id="L161" class="LineNr">161 </span><span class="Comment"># hash on containers includes all elements</span>
<span id="L162" class="LineNr">162 </span><span class="traceContains">+mem: storing 0 in location 9</span>
<span id="L163" class="LineNr">163 </span>
<span id="L164" class="LineNr">164 </span><span class="Delimiter">:(scenario hash_can_ignore_container_elements)</span>
<span id="L165" class="LineNr">165 </span><span class="muData">container</span> foo [
<span id="L166" class="LineNr">166 </span> <span class="Normal">x</span>:num
<span id="L167" class="LineNr">167 </span> <span class="Normal">y</span>:<span class="Normal">char</span>/ignore-<span class="Normal">for</span>-hash
<span id="L168" class="LineNr">168 </span>]
<span id="L169" class="LineNr">169 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L170" class="LineNr">170 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">97</span>/a
<span id="L171" class="LineNr">171 </span> <span class="Constant">3</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>:foo
<span id="L172" class="LineNr">172 </span> <span class="Identifier">return</span>-unless <span class="Constant">3</span>:num
<span id="L173" class="LineNr">173 </span> <span class="Constant">4</span>:foo<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">98</span>/a
<span id="L174" class="LineNr">174 </span> <span class="Constant">6</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">4</span>:foo
<span id="L175" class="LineNr">175 </span> <span class="Identifier">return</span>-unless <span class="Constant">6</span>:num
<span id="L176" class="LineNr">176 </span> <span class="Constant">7</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">3</span>:num<span class="Delimiter">,</span> <span class="Constant">6</span>:num
<span id="L177" class="LineNr">177 </span>]
<span id="L178" class="LineNr">178 </span><span class="Comment"># hashes match even though y is different</span>
<span id="L179" class="LineNr">179 </span><span class="traceContains">+mem: storing 1 in location 7</span>
<span id="L180" class="LineNr">180 </span>
<span id="L181" class="LineNr">181 </span><span class="Comment">//: These properties aren't necessary for hash, they just test that the</span>
<span id="L182" class="LineNr">182 </span><span class="Comment">//: current implementation works like we think it does.</span>
<span id="L183" class="LineNr">183 </span>
<span id="L184" class="LineNr">184 </span><span class="Delimiter">:(scenario hash_of_zero_address)</span>
<span id="L185" class="LineNr">185 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L186" class="LineNr">186 </span> <span class="Constant">1</span>:&:num<span class="Special"> <- </span>copy<span class="Constant"> null</span>
<span id="L187" class="LineNr">187 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>:&:num
<span id="L188" class="LineNr">188 </span>]
<span id="L189" class="LineNr">189 </span><span class="traceContains">+mem: storing 0 in location 2</span>
<span id="L190" class="LineNr">190 </span>
<span id="L191" class="LineNr">191 </span><span class="Comment">//: This is probably too aggressive, but we need some way to avoid depending</span>
<span id="L192" class="LineNr">192 </span><span class="Comment">//: on the precise bit pattern of a floating-point number.</span>
<span id="L193" class="LineNr">193 </span><span class="Delimiter">:(scenario hash_of_numbers_ignores_fractional_part)</span>
<span id="L194" class="LineNr">194 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L195" class="LineNr">195 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1.5</span>
<span id="L196" class="LineNr">196 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>
<span id="L197" class="LineNr">197 </span> <span class="Constant">3</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">1</span>:num<span class="Delimiter">,</span> <span class="Constant">2</span>:num
<span id="L198" class="LineNr">198 </span>]
<span id="L199" class="LineNr">199 </span><span class="traceContains">+mem: storing 1 in location 3</span>
<span id="L200" class="LineNr">200 </span>
<span id="L201" class="LineNr">201 </span><span class="Delimiter">:(scenario hash_of_array_same_as_string)</span>
<span id="L202" class="LineNr">202 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L203" class="LineNr">203 </span> <span class="Constant">10</span>:num<span class="Special"> <- </span>copy <span class="Constant">3</span>
<span id="L204" class="LineNr">204 </span> <span class="Constant">11</span>:num<span class="Special"> <- </span>copy <span class="Constant">97</span>
<span id="L205" class="LineNr">205 </span> <span class="Constant">12</span>:num<span class="Special"> <- </span>copy <span class="Constant">98</span>
<span id="L206" class="LineNr">206 </span> <span class="Constant">13</span>:num<span class="Special"> <- </span>copy <span class="Constant">99</span>
<span id="L207" class="LineNr">207 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">10</span>:@:num/unsafe
<span id="L208" class="LineNr">208 </span> <span class="Identifier">return</span>-unless <span class="Constant">2</span>:num
<span id="L209" class="LineNr">209 </span> <span class="Constant">3</span>:text<span class="Special"> <- </span><span class="Normal">new</span> [abc]
<span id="L210" class="LineNr">210 </span> <span class="Constant">4</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">3</span>:text
<span id="L211" class="LineNr">211 </span> <span class="Identifier">return</span>-unless <span class="Constant">4</span>:num
<span id="L212" class="LineNr">212 </span> <span class="Constant">5</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">2</span>:num<span class="Delimiter">,</span> <span class="Constant">4</span>:num
<span id="L213" class="LineNr">213 </span>]
<span id="L214" class="LineNr">214 </span><span class="traceContains">+mem: storing 1 in location 5</span>
<span id="L215" class="LineNr">215 </span>
<span id="L216" class="LineNr">216 </span><span class="Delimiter">:(scenario hash_ignores_address_value)</span>
<span id="L217" class="LineNr">217 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L218" class="LineNr">218 </span> <span class="Constant">1</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L219" class="LineNr">219 </span> *<span class="Constant">1</span>:&:num<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L220" class="LineNr">220 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>:&:num
<span id="L221" class="LineNr">221 </span> <span class="Constant">3</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L222" class="LineNr">222 </span> *<span class="Constant">3</span>:&:num<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L223" class="LineNr">223 </span> <span class="Constant">4</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">3</span>:&:num
<span id="L224" class="LineNr">224 </span> <span class="Constant">5</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">2</span>:num<span class="Delimiter">,</span> <span class="Constant">4</span>:num
<span id="L225" class="LineNr">225 </span>]
<span id="L226" class="LineNr">226 </span><span class="Comment"># different addresses hash to the same result as long as the values the point to do so</span>
<span id="L227" class="LineNr">227 </span><span class="traceContains">+mem: storing 1 in location 5</span>
<span id="L228" class="LineNr">228 </span>
<span id="L229" class="LineNr">229 </span><span class="Delimiter">:(scenario hash_container_depends_only_on_elements)</span>
<span id="L230" class="LineNr">230 </span><span class="muData">container</span> foo [
<span id="L231" class="LineNr">231 </span> <span class="Normal">x</span>:num
<span id="L232" class="LineNr">232 </span> <span class="Normal">y</span>:<span class="Normal">char</span>
<span id="L233" class="LineNr">233 </span>]
<span id="L234" class="LineNr">234 </span><span class="muData">container</span> bar [
<span id="L235" class="LineNr">235 </span> <span class="Normal">x</span>:num
<span id="L236" class="LineNr">236 </span> <span class="Normal">y</span>:<span class="Normal">char</span>
<span id="L237" class="LineNr">237 </span>]
<span id="L238" class="LineNr">238 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L239" class="LineNr">239 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">97</span>/a
<span id="L240" class="LineNr">240 </span> <span class="Constant">3</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>:foo
<span id="L241" class="LineNr">241 </span> <span class="Identifier">return</span>-unless <span class="Constant">3</span>:num
<span id="L242" class="LineNr">242 </span> <span class="Constant">4</span>:bar<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">97</span>/a
<span id="L243" class="LineNr">243 </span> <span class="Constant">6</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">4</span>:bar
<span id="L244" class="LineNr">244 </span> <span class="Identifier">return</span>-unless <span class="Constant">6</span>:num
<span id="L245" class="LineNr">245 </span> <span class="Constant">7</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">3</span>:num<span class="Delimiter">,</span> <span class="Constant">6</span>:num
<span id="L246" class="LineNr">246 </span>]
<span id="L247" class="LineNr">247 </span><span class="Comment"># containers with identical elements return identical hashes</span>
<span id="L248" class="LineNr">248 </span><span class="traceContains">+mem: storing 1 in location 7</span>
<span id="L249" class="LineNr">249 </span>
<span id="L250" class="LineNr">250 </span><span class="Delimiter">:(scenario hash_container_depends_only_on_elements_2)</span>
<span id="L251" class="LineNr">251 </span><span class="muData">container</span> foo [
<span id="L252" class="LineNr">252 </span> <span class="Normal">x</span>:num
<span id="L253" class="LineNr">253 </span> <span class="Normal">y</span>:<span class="Normal">char</span>
<span id="L254" class="LineNr">254 </span> <span class="Normal">z</span>:&:num
<span id="L255" class="LineNr">255 </span>]
<span id="L256" class="LineNr">256 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L257" class="LineNr">257 </span> <span class="Constant">1</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L258" class="LineNr">258 </span> *<span class="Constant">1</span>:&:num<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L259" class="LineNr">259 </span> <span class="Constant">2</span>:foo<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">97</span>/a<span class="Delimiter">,</span> <span class="Constant">1</span>:&:num
<span id="L260" class="LineNr">260 </span> <span class="Constant">5</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">2</span>:foo
<span id="L261" class="LineNr">261 </span> <span class="Identifier">return</span>-unless <span class="Constant">5</span>:num
<span id="L262" class="LineNr">262 </span> <span class="Constant">6</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L263" class="LineNr">263 </span> *<span class="Constant">6</span>:&:num<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L264" class="LineNr">264 </span> <span class="Constant">7</span>:foo<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">97</span>/a<span class="Delimiter">,</span> <span class="Constant">6</span>:&:num
<span id="L265" class="LineNr">265 </span> <span class="Constant">10</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">7</span>:foo
<span id="L266" class="LineNr">266 </span> <span class="Identifier">return</span>-unless <span class="Constant">10</span>:num
<span id="L267" class="LineNr">267 </span> <span class="Constant">11</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">5</span>:num<span class="Delimiter">,</span> <span class="Constant">10</span>:num
<span id="L268" class="LineNr">268 </span>]
<span id="L269" class="LineNr">269 </span><span class="Comment"># containers with identical 'leaf' elements return identical hashes</span>
<span id="L270" class="LineNr">270 </span><span class="traceContains">+mem: storing 1 in location 11</span>
<span id="L271" class="LineNr">271 </span>
<span id="L272" class="LineNr">272 </span><span class="Delimiter">:(scenario hash_container_depends_only_on_elements_3)</span>
<span id="L273" class="LineNr">273 </span><span class="muData">container</span> foo [
<span id="L274" class="LineNr">274 </span> <span class="Normal">x</span>:num
<span id="L275" class="LineNr">275 </span> <span class="Normal">y</span>:<span class="Normal">char</span>
<span id="L276" class="LineNr">276 </span> <span class="Normal">z</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">x</span>:num
<span id="L280" class="LineNr">280 </span> <span class="Normal">y</span>:num
<span id="L281" class="LineNr">281 </span>]
<span id="L282" class="LineNr">282 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L283" class="LineNr">283 </span> <span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">97</span>/a<span class="Delimiter">,</span> <span class="Constant">47</span><span class="Delimiter">,</span> <span class="Constant">48</span>
<span id="L284" class="LineNr">284 </span> <span class="Constant">6</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>:foo
<span id="L285" class="LineNr">285 </span> <span class="Identifier">return</span>-unless <span class="Constant">6</span>:num
<span id="L286" class="LineNr">286 </span> <span class="Constant">7</span>:foo<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">97</span>/a<span class="Delimiter">,</span> <span class="Constant">47</span><span class="Delimiter">,</span> <span class="Constant">48</span>
<span id="L287" class="LineNr">287 </span> <span class="Constant">12</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">7</span>:foo
<span id="L288" class="LineNr">288 </span> <span class="Identifier">return</span>-unless <span class="Constant">12</span>:num
<span id="L289" class="LineNr">289 </span> <span class="Constant">13</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">6</span>:num<span class="Delimiter">,</span> <span class="Constant">12</span>:num
<span id="L290" class="LineNr">290 </span>]
<span id="L291" class="LineNr">291 </span><span class="Comment"># containers with identical 'leaf' elements return identical hashes</span>
<span id="L292" class="LineNr">292 </span><span class="traceContains">+mem: storing 1 in location 13</span>
<span id="L293" class="LineNr">293 </span>
<span id="L294" class="LineNr">294 </span><span class="Delimiter">:(scenario hash_exclusive_container_ignores_tag)</span>
<span id="L295" class="LineNr">295 </span><span class="muData">exclusive-container</span> foo [
<span id="L296" class="LineNr">296 </span> <span class="Normal">x</span>:bar
<span id="L297" class="LineNr">297 </span> <span class="Normal">y</span>:num
<span id="L298" class="LineNr">298 </span>]
<span id="L299" class="LineNr">299 </span><span class="muData">container</span> bar [
<span id="L300" class="LineNr">300 </span> <span class="Normal">a</span>:num
<span id="L301" class="LineNr">301 </span> <span class="Normal">b</span>:num
<span id="L302" class="LineNr">302 </span>]
<span id="L303" class="LineNr">303 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L304" class="LineNr">304 </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 class="Delimiter">,</span> <span class="Constant">35</span>
<span id="L305" class="LineNr">305 </span> <span class="Constant">4</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>:foo
<span id="L306" class="LineNr">306 </span> <span class="Identifier">return</span>-unless <span class="Constant">4</span>:num
<span id="L307" class="LineNr">307 </span> <span class="Constant">5</span>:bar<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span>
<span id="L308" class="LineNr">308 </span> <span class="Constant">7</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">5</span>:bar
<span id="L309" class="LineNr">309 </span> <span class="Identifier">return</span>-unless <span class="Constant">7</span>:num
<span id="L310" class="LineNr">310 </span> <span class="Constant">8</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">4</span>:num<span class="Delimiter">,</span> <span class="Constant">7</span>:num
<span id="L311" class="LineNr">311 </span>]
<span id="L312" class="LineNr">312 </span><span class="Comment"># hash on containers includes all elements</span>
<span id="L313" class="LineNr">313 </span><span class="traceContains">+mem: storing 1 in location 8</span>
<span id="L314" class="LineNr">314 </span>
<span id="L315" class="LineNr">315 </span><span class="Comment">//: An older version that supported only strings.</span>
<span id="L316" class="LineNr">316 </span><span class="Comment">//: Hash functions are subtle and easy to get wrong, so we keep the old</span>
<span id="L317" class="LineNr">317 </span><span class="Comment">//: version around and check that the new one is consistent with it.</span>
<span id="L318" class="LineNr">318 </span>
<span id="L319" class="LineNr">319 </span><span class="Delimiter">:(scenario hash_matches_old_version)</span>
<span id="L320" class="LineNr">320 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L321" class="LineNr">321 </span> <span class="Constant">1</span>:text<span class="Special"> <- </span><span class="Normal">new</span> [abc]
<span id="L322" class="LineNr">322 </span> <span class="Constant">3</span>:num<span class="Special"> <- </span><a href='069hash.cc.html#L34'>hash</a> <span class="Constant">1</span>:text
<span id="L323" class="LineNr">323 </span> <span class="Constant">4</span>:num<span class="Special"> <- </span>hash_old <span class="Constant">1</span>:text
<span id="L324" class="LineNr">324 </span> <span class="Constant">5</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">3</span>:num<span class="Delimiter">,</span> <span class="Constant">4</span>:num
<span id="L325" class="LineNr">325 </span>]
<span id="L326" class="LineNr">326 </span><span class="traceContains">+mem: storing 1 in location 5</span>
<span id="L327" class="LineNr">327 </span>
<span id="L328" class="LineNr">328 </span><span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
<span id="L329" class="LineNr">329 </span>HASH_OLD<span class="Delimiter">,</span>
<span id="L330" class="LineNr">330 </span><span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
<span id="L331" class="LineNr">331 </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">"hash_old"</span><span class="Delimiter">,</span> HASH_OLD<span class="Delimiter">);</span>
<span id="L332" class="LineNr">332 </span><span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
<span id="L333" class="LineNr">333 </span><span class="Normal">case</span> HASH_OLD: <span class="Delimiter">{</span>
<span id="L334" class="LineNr">334 </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">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L335" class="LineNr">335 </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">"'hash_old' takes exactly one ingredient rather than '"</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="L336" class="LineNr">336 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L337" class="LineNr">337 </span> <span class="Delimiter">}</span>
<span id="L338" class="LineNr">338 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_text<span class="Delimiter">(</span>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 class="Delimiter">{</span>
<span id="L339" class="LineNr">339 </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">"'hash_old' currently only supports texts (address array character), but got '"</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</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="L340" class="LineNr">340 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L341" class="LineNr">341 </span> <span class="Delimiter">}</span>
<span id="L342" class="LineNr">342 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L343" class="LineNr">343 </span><span class="Delimiter">}</span>
<span id="L344" class="LineNr">344 </span><span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span id="L345" class="LineNr">345 </span><span class="Normal">case</span> HASH_OLD: <span class="Delimiter">{</span>
<span id="L346" class="LineNr">346 </span> string input = <a href='038new_text.cc.html#L142'>read_mu_text</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">skip alloc id</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">));</span>
<span id="L347" class="LineNr">347 </span> <span class="Normal">size_t</span> h = <span class="Constant">0</span> <span class="Delimiter">;</span>
<span id="L348" class="LineNr">348 </span>
<span id="L349" class="LineNr">349 </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>input<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L350" class="LineNr">350 </span> h += <span class="Normal">static_cast</span><<span class="Normal">size_t</span>><span class="Delimiter">(</span>input<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span id="L351" class="LineNr">351 </span> h += <span class="Delimiter">(</span>h<<<span class="Constant">10</span><span class="Delimiter">);</span>
<span id="L352" class="LineNr">352 </span> h ^= <span class="Delimiter">(</span>h>><span class="Constant">6</span><span class="Delimiter">);</span>
<span id="L353" class="LineNr">353 </span>
<span id="L354" class="LineNr">354 </span> h += <span class="Delimiter">(</span>h<<<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L355" class="LineNr">355 </span> h ^= <span class="Delimiter">(</span>h>><span class="Constant">11</span><span class="Delimiter">);</span>
<span id="L356" class="LineNr">356 </span> h += <span class="Delimiter">(</span>h<<<span class="Constant">15</span><span class="Delimiter">);</span>
<span id="L357" class="LineNr">357 </span> <span class="Delimiter">}</span>
<span id="L358" class="LineNr">358 </span>
<span id="L359" class="LineNr">359 </span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L360" class="LineNr">360 </span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>h<span class="Delimiter">);</span>
<span id="L361" class="LineNr">361 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L362" class="LineNr">362 </span><span class="Delimiter">}</span>
</pre>
</body>
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