NAME¶

std::atomic::fetch_or - std::atomic::fetch_or

Synopsis¶

member only of atomic<Integral > specializations
T fetch_or( T arg, std::memory_order order = (1) (since C++11)
std::memory_order_seq_cst ) noexcept;
T fetch_or( T arg, std::memory_order order =
std::memory_order_seq_cst ) volatile (2) (since C++11)
noexcept;

Atomically replaces the current value with the result of bitwise OR of the value and
arg. The operation is read-modify-write operation. Memory is affected according to
the value of order.

It is deprecated if std::atomic<T>::is_always_lock_free is false and (since C++20)
overload (2) participates in overload resolution.

Parameters¶

arg - the other argument of bitwise OR
order - memory order constraints to enforce

Return value¶

The value immediately preceding the effects of this function in the modification
order of *this.

See also¶

atomic_fetch_or replaces the atomic object with the result of bitwise OR
atomic_fetch_or_explicit with a non-atomic argument and obtains the previous value
(C++11) of the atomic
(C++11) (function template)