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Showing content from https://en.cppreference.com/w/cpp/language/../atomic/atomic/fetch_or.html below:

std::atomic<T>::fetch_or - cppreference.com

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 overload (2) participates in overload resolution.

(since C++20) [edit] Parameters arg - the other argument of bitwise OR order - memory order constraints to enforce [edit] Return value

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

[edit] See also

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