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`std::atomic_flag::test_and_set` member function

Atomically set the flag and check whether or not it was set.

bool test_and_set(
    memory_order order = memory_order_seq_cst)
    volatile;

Effects:: Atomically sets the flag.
Returns:: true if the flag was set at the point of the call, false if the flag was clear.
Throws:: Nothing.
Note:: This is an atomic read-modify-write operation for the memory location comprising *this.

Header

#include <atomic>

See Also