std::atomic_ref::fetch_and (3) Linux Manual Page

std::atomic_ref<T>::fetch_and – std::atomic_ref<T>::fetch_and

Synopsis

T fetch_and(T arg, (since C++ 20)

                       std::memory_order order = std::memory_order_seq_cst) const noexcept;
(member only of atomic_ref<Integral> template specialization)

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.