std::atomic_ref<T>::exchange
From cppreference.com
< cpp | atomic | atomic ref
value_type exchange( value_type desired, std::memory_order order = |
(constexpr since C++26) | |
Atomically replaces the value of the referenced object with desired. The operation is a read-modify-write operation. Memory is affected according to the value of order.
This overload participates in overload resolution only if std::is_const_v<T> is false.
[edit] Parameters
desired | - | value to assign |
order | - | memory order constraints to enforce |
[edit] Return value
The value of the referenced object before the call.
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
LWG 3508 (P3323R1) |
C++20 | exchange was meaningless for const T
|
constrained to accept only non-const T
|