std::atomic_ref<T>::fetch_and
Provided only when T is an integral type other than cv bool
| ||
value_type fetch_and( value_type arg,
std::memory_order order =
std::memory_order_seq_cst ) const noexcept;
| (since C++20) |
Atomically replaces the current value of the referenced object with the result of bitwise AND of the value and arg. This 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.
Parameters
| arg | - | the other argument of bitwise AND |
| order | - | memory order constraints to enforce |
Return value
The value of the referenced object, immediately preceding the effects of this function.
Example
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 |
fetch_and was meaningless for constT | constrained to accept only non-const T |
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