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//: Calls can also generate products, using 'reply'.
:(scenario reply)
recipe main [
1:integer, 2:integer <- f 34:literal
]
recipe f [
12:integer <- next-ingredient
13:integer <- add 1:literal, 12:integer
reply 12:integer, 13:integer
]
+run: instruction main/0
+mem: storing 34 in location 1
+mem: storing 35 in location 2
:(before "End Primitive Recipe Declarations")
REPLY,
:(before "End Primitive Recipe Numbers")
Recipe_number["reply"] = REPLY;
:(before "End Primitive Recipe Implementations")
case REPLY: {
const instruction& reply_inst = current_instruction(); // save pointer into recipe before pop
Current_routine->calls.pop();
assert(!Current_routine->calls.empty());
const instruction& caller_instruction = current_instruction();
// make reply results available to caller
copy(ingredients.begin(), ingredients.end(), inserter(products, products.begin()));
// check that any reply ingredients with /same-as-ingredient connect up
// the corresponding ingredient and product in the caller.
for (index_t i = 0; i < caller_instruction.products.size(); ++i) {
trace("run") << "result " << i << " is " << to_string(ingredients.at(i));
if (has_property(reply_inst.ingredients.at(i), "same-as-ingredient")) {
vector<string> tmp = property(reply_inst.ingredients.at(i), "same-as-ingredient");
assert(tmp.size() == 1);
long long int ingredient_index = to_int(tmp.at(0));
if (caller_instruction.products.at(i).value != caller_instruction.ingredients[ingredient_index].value)
raise << "'same-as-ingredient' result " << caller_instruction.products.at(i).value << " must be location " << caller_instruction.ingredients[ingredient_index].value << '\n';
}
}
// refresh instruction_counter to caller's step_index
instruction_counter = current_step_index();
break;
}
//: Products can include containers and exclusive containers, addresses and arrays.
:(scenario reply_container)
recipe main [
3:point <- f 2:literal
]
recipe f [
12:integer <- next-ingredient
13:integer <- copy 35:literal
reply 12:point
]
+run: instruction main/0
+run: result 0 is [2, 35]
+mem: storing 2 in location 3
+mem: storing 35 in location 4
//: In mu we'd like to assume that any instruction doesn't modify its
//: ingredients unless they're also products. The /same-as-ingredient inside
//: the recipe's 'reply' will help catch accidental misuse of such
//: 'ingredient-results' (sometimes called in-out parameters in other languages).
:(scenario reply_same_as_ingredient)
% Hide_warnings = true;
recipe main [
1:integer <- copy 0:literal
2:integer <- test1 1:integer # call with different ingredient and product
]
recipe test1 [
10:address:integer <- next-ingredient
reply 10:address:integer/same-as-ingredient:0
]
+warn: 'same-as-ingredient' result 2 must be location 1
:(code)
string to_string(const vector<long long int>& in) {
if (in.empty()) return "[]";
ostringstream out;
if (in.size() == 1) {
out << in.at(0);
return out.str();
}
out << "[";
for (index_t i = 0; i < in.size(); ++i) {
if (i > 0) out << ", ";
out << in.at(i);
}
out << "]";
return out.str();
}
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