html/033length.cc.html


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<pre id='vimCodeElement'>
<span class="Comment">//: Recipe to compute the length of an array.</span>

<span class="Delimiter">:(scenario array_length)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">3</span>:literal  <span class="Comment"># length</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">14</span>:literal
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">15</span>:literal
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">16</span>:literal
  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>length <span class="Constant">1</span>:array:number
]
<span class="traceContains">+run: instruction main/4</span>
<span class="traceContains">+mem: storing 3 in location 5</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
LENGTH<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
Recipe_number[<span class="Constant">&quot;length&quot;</span>] = LENGTH<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case LENGTH: <span class="Delimiter">{</span>
  reagent x = canonize<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
  if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> != Type_number[<span class="Constant">&quot;array&quot;</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; <span class="Constant">&quot;tried to calculate length of non-array &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</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>Memory[x<span class="Delimiter">.</span>value]<span class="Delimiter">);</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
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