std::atomic_ref::fetch_and(3)

NAME
std::atomic_ref::fetch_and - std::atomic_ref::fetch_and

Synopsis
   member only of atomic_ref<Integral> specializations
   T fetch_and( T arg,
                std::memory_order order = std::memory_order_seq_cst ) (since C++20)
   const noexcept;
   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.