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algorithm: Construct the let() value in place #52

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Merged
avdgrinten merged 1 commit into from
Oct 16, 2026
Merged

algorithm: Construct the let() value in place #52

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10 changes: 6 additions & 4 deletions include/async/algorithm.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -453,26 +453,28 @@ struct let_operation {
using value_type = typename sender_type::value_type;

let_operation(Pred pred, Func func, Receiver r)
: pred_{std::move(pred)}, func_{std::move(func)}, imm_{}, r_{std::move(r)} { }
: pred_{std::move(pred)}, func_{std::move(func)}, r_{std::move(r)} { }

let_operation(const let_operation &) = delete;
let_operation &operator=(const let_operation &) = delete;

~let_operation() {
op_.destruct();
imm_.destruct();
}

public:
void start() {
imm_ = std::move(pred_());
op_.construct_with([&]{ return execution::connect(func_(imm_), std::move(r_)); });
// Constructed in place so that imm_type need not be movable.
imm_.construct_with([&]{ return pred_(); });
op_.construct_with([&]{ return execution::connect(func_(*imm_), std::move(r_)); });
return execution::start(*op_);
}

private:
Pred pred_;
Func func_;
imm_type imm_;
frg::manual_box<imm_type> imm_;
Receiver r_;
frg::manual_box<execution::operation_t<sender_type, Receiver>> op_;
};
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