Performs a bitwise or on a value and an existing value that is stored in an atomic object.
A pointer to an atomic object that stores a value of type T.
A value of type T.
The value contained by the atomic object immediately before the operation was performed.
The atomic_fetch_or function performs a read-modify-write operation to replace the stored value of Atom with a bitwise or of Value and the current value that is stored in Atom, using the memory_order_seq_cst memory_order.