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<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"> <- </span>f <span class="Constant">34</span>
]
recipe f [
<span class="Constant">12</span>:number<span class="Special"> <- </span>next-ingredient
<span class="Constant">13</span>:number<span class="Special"> <- </span>add <span class="Constant">1</span><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 "End Primitive Recipe Declarations")</span>
REPLY<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"reply"</span>] = REPLY<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case REPLY: <span class="Delimiter">{</span>
<span class="Comment">// Starting Reply</span>
const instruction& reply_inst = current_instruction<span class="Delimiter">();</span> <span class="Comment">// save pointer into recipe before pop</span>
const string& callee = current_recipe_name<span class="Delimiter">();</span>
--Callstack_depth<span class="Delimiter">;</span>
Current_routine<span class="Delimiter">-></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">-></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& caller_instruction = current_instruction<span class="Delimiter">();</span>
<span class="Comment">// make reply products 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>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">)</span> > SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span>
raise << <span class="Constant">"too few values replied from "</span> << callee << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < 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>
trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result "</span> << i << <span class="Constant">" is "</span> << to_string<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> << end<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">"same-as-ingredient"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
vector<string> 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">"same-as-ingredient"</span><span class="Delimiter">);</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>tmp<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'same-as-ingredient' metadata should take exactly one value in "</span> << reply_inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">goto</span> finish_reply<span class="Delimiter">;</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>ingredient_index >= SIZE<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'same-as-ingredient' metadata overflows ingredients in: "</span> << caller_instruction<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
if <span class="Delimiter">(</span>!is_dummy<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> && 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 << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'same-as-ingredient' result "</span> << caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>value << <span class="Constant">" from call to "</span> << callee << <span class="Constant">" must be location "</span> << 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="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">// End Reply</span>
finish_reply:
<span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// continue to process rest of *caller* instruction</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"> <- </span>f <span class="Constant">2</span>
]
recipe f [
<span class="Constant">12</span>:number<span class="Special"> <- </span>next-ingredient
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
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-products' (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"> <- </span>copy <span class="Constant">0</span>
<span class="Constant">2</span>:number<span class="Special"> <- </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"> <- </span>next-ingredient
reply <span class="Constant">10</span>:address:number/same-as-ingredient:<span class="Constant">0</span>
]
<span class="traceContains">+warn: main: 'same-as-ingredient' result 2 from call to test1 must be location 1</span>
<span class="Delimiter">:(scenario reply_same_as_ingredient_dummy)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
_<span class="Special"> <- </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"> <- </span>next-ingredient
reply <span class="Constant">10</span>:address:number/same-as-ingredient:<span class="Constant">0</span>
]
$warn: <span class="Constant">0</span>
<span class="Delimiter">:(code)</span>
string to_string<span class="Delimiter">(</span>const vector<double>& 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">"[]"</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 << 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 << <span class="Constant">"["</span><span class="Delimiter">;</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < 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 > <span class="Constant">0</span><span class="Delimiter">)</span> out << <span class="Constant">", "</span><span class="Delimiter">;</span>
out << in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
out << <span class="Constant">"]"</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"> <- </span>test1
]
recipe test1 [
reply-if <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span>
reply <span class="Constant">35</span>
]
<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"> <- </span>test1
]
recipe test1 [
reply-if <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">34</span>
reply <span class="Constant">35</span>
]
<span class="traceContains">+mem: storing 34 in location 1</span>
<span class="Delimiter">:(before "End Rewrite Instruction(curr)")</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">"reply-if"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
curr<span class="Delimiter">.</span>operation = Recipe_ordinal[<span class="Constant">"jump-unless"</span>]<span class="Delimiter">;</span>
curr<span class="Delimiter">.</span>name = <span class="Constant">"jump-unless"</span><span class="Delimiter">;</span>
vector<reagent> 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">"1:offset"</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_ordinal[<span class="Constant">"reply"</span>]<span class="Delimiter">;</span>
curr<span class="Delimiter">.</span>name = <span class="Constant">"reply"</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>
else <span class="Delimiter">{</span>
raise << <span class="Constant">"'reply-if' never yields any products</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">// rewrite `reply-unless a, b, c, ...` to</span>
<span class="Comment">// ```</span>
<span class="Comment">// jump-if 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">"reply-unless"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
curr<span class="Delimiter">.</span>operation = Recipe_ordinal[<span class="Constant">"jump-if"</span>]<span class="Delimiter">;</span>
curr<span class="Delimiter">.</span>name = <span class="Constant">"jump-if"</span><span class="Delimiter">;</span>
vector<reagent> 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">"1:offset"</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_ordinal[<span class="Constant">"reply"</span>]<span class="Delimiter">;</span>
curr<span class="Delimiter">.</span>name = <span class="Constant">"reply"</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>
else <span class="Delimiter">{</span>
raise << <span class="Constant">"'reply-unless' never yields any products</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
</pre>
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