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<pre id='vimCodeElement'>
<span class="Comment">//: Calls can also generate products, using 'reply'.</span>

<span class="Delimiter">:(scenario reply)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>f <span class="Constant">34</span>:literal
]
recipe f [
  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>next-ingredient
  <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>add <span class="Constant">1</span>:literal<span class="Delimiter">,</span> <span class="Constant">12</span>:number
  reply <span class="Constant">12</span>:number<span class="Delimiter">,</span> <span class="Constant">13</span>:number
]
<span class="traceContains">+mem: storing 34 in location 1</span>
<span class="traceContains">+mem: storing 35 in location 2</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
REPLY<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
Recipe_number[<span class="Constant">&quot;reply&quot;</span>] = REPLY<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case REPLY: <span class="Delimiter">{</span>
  const instruction&amp; reply_inst = current_instruction<span class="Delimiter">();</span>  <span class="Comment">// save pointer into recipe before pop</span>
  --Callstack_depth<span class="Delimiter">;</span>
<span class="CommentedCode">//?   if (tb_is_active()) { //? 1</span>
<span class="CommentedCode">//?     tb_clear(); //? 1</span>
<span class="CommentedCode">//?     cerr &lt;&lt; Recipe[Current_routine-&gt;calls.front().running_recipe].name &lt;&lt; ' ' &lt;&lt; current_step_index() &lt;&lt; '\n'; //? 1</span>
<span class="CommentedCode">//?   } //? 1</span>
  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span>
  <span class="Comment">// just in case 'main' returns a value, drop it for now</span>
  if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">goto</span> stop_running_current_routine<span class="Delimiter">;</span>
  const instruction&amp; caller_instruction = current_instruction<span class="Delimiter">();</span>
  <span class="Comment">// make reply results available to caller</span>
  copy<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>products<span class="Delimiter">,</span> products<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
  <span class="Comment">// check that any reply ingredients with /same-as-ingredient connect up</span>
  <span class="Comment">// the corresponding ingredient and product in the caller.</span>
  for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?     cerr &lt;&lt; Recipe[Current_routine-&gt;calls.front().running_recipe].name &lt;&lt; '\n'; //? 1</span>
    trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;result &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
    if <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>reply_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;same-as-ingredient&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
      vector&lt;string&gt; tmp = property<span class="Delimiter">(</span>reply_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;same-as-ingredient&quot;</span><span class="Delimiter">);</span>
      assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>tmp<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>
      long long int ingredient_index = to_integer<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
      if <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>value != caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>value<span class="Delimiter">)</span>
        raise &lt;&lt; <span class="Constant">&quot;'same-as-ingredient' result &quot;</span> &lt;&lt; caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>value &lt;&lt; <span class="Constant">&quot; must be location &quot;</span> &lt;&lt; caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>value &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Comment">// refresh instruction_counter to caller's step_index</span>
  instruction_counter = current_step_index<span class="Delimiter">();</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">//: Products can include containers and exclusive containers, addresses and arrays.</span>
<span class="Delimiter">:(scenario reply_container)</span>
recipe main [
  <span class="Constant">3</span>:point<span class="Special"> &lt;- </span>f <span class="Constant">2</span>:literal
]
recipe f [
  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>next-ingredient
  <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>:literal
  reply <span class="Constant">12</span>:point/<span class="Special">raw</span>  <span class="Comment"># unsafe</span>
]
<span class="traceContains">+run: result 0 is [2, 35]</span>
<span class="traceContains">+mem: storing 2 in location 3</span>
<span class="traceContains">+mem: storing 35 in location 4</span>

<span class="Comment">//: In mu we'd like to assume that any instruction doesn't modify its</span>
<span class="Comment">//: ingredients unless they're also products. The /same-as-ingredient inside</span>
<span class="Comment">//: the recipe's 'reply' will help catch accidental misuse of such</span>
<span class="Comment">//: 'ingredient-results' (sometimes called in-out parameters in other languages).</span>

<span class="Delimiter">:(scenario reply_same_as_ingredient)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>test1 <span class="Constant">1</span>:number  <span class="Comment"># call with different ingredient and product</span>
]
recipe test1 [
  <span class="Constant">10</span>:address:number<span class="Special"> &lt;- </span>next-ingredient
  reply <span class="Constant">10</span>:address:number/same-as-ingredient:<span class="Constant">0</span>
]
<span class="traceContains">+warn: 'same-as-ingredient' result 2 must be location 1</span>

<span class="Delimiter">:(code)</span>
string to_string<span class="Delimiter">(</span>const vector&lt;double&gt;&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">&quot;[]&quot;</span><span class="Delimiter">;</span>
  ostringstream out<span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>in<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    out &lt;&lt; in<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
    <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
  out &lt;&lt; <span class="Constant">&quot;[&quot;</span><span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>in<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
    out &lt;&lt; in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
  <span class="Delimiter">}</span>
  out &lt;&lt; <span class="Constant">&quot;]&quot;</span><span class="Delimiter">;</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Comment">//: Conditional reply.</span>

<span class="Delimiter">:(scenario reply_if)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>test1
]
recipe test1 [
  reply-if <span class="Constant">0</span>:literal<span class="Delimiter">,</span> <span class="Constant">34</span>:literal
  reply <span class="Constant">35</span>:literal
]
<span class="traceContains">+mem: storing 35 in location 1</span>

<span class="Delimiter">:(scenario reply_if2)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>test1
]
recipe test1 [
  reply-if <span class="Constant">1</span>:literal<span class="Delimiter">,</span> <span class="Constant">34</span>:literal
  reply <span class="Constant">35</span>:literal
]
<span class="traceContains">+mem: storing 34 in location 1</span>

<span class="Delimiter">:(before &quot;End Rewrite Instruction(curr)&quot;)</span>
<span class="Comment">// rewrite `reply-if a, b, c, ...` to</span>
<span class="Comment">//   ```</span>
<span class="Comment">//   jump-unless a, 1:offset</span>
<span class="Comment">//   reply b, c, ...</span>
<span class="Comment">//   ```</span>
if <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply-if&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
  curr<span class="Delimiter">.</span>operation = Recipe_number[<span class="Constant">&quot;jump-unless&quot;</span>]<span class="Delimiter">;</span>
  vector&lt;reagent&gt; results<span class="Delimiter">;</span>
  copy<span class="Delimiter">(</span>++curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>results<span class="Delimiter">,</span> results<span class="Delimiter">.</span>end<span class="Delimiter">()));</span>
  curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
  curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">&quot;1:offset&quot;</span><span class="Delimiter">));</span>
  result<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
  curr<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
  curr<span class="Delimiter">.</span>operation = Recipe_number[<span class="Constant">&quot;reply&quot;</span>]<span class="Delimiter">;</span>
  curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>swap<span class="Delimiter">(</span>results<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
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