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std::atomic_ref<T>:: fetch_and

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atomic_ref::fetch_and
Constants
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 .

Contents

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

This section is incomplete
Reason: no 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 const T constrained to accept only non-const T