std::atomic_ref<T>:: fetch_and

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atomic_ref::fetch_and
member only of atomic_ref< Integral > specializations
T fetch_and ( T 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 .

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.

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