std::atomic_flag::test_and_set

From cppreference.com
< cpp‎ | atomic‎ | atomic flag
Defined in header <atomic>
bool test_and_set(std::memory_order order = std::memory_order_seq_cst) volatile;
(1) (since C++11)
bool test_and_set(std::memory_order order = std::memory_order_seq_cst);
(2) (since C++11)

Atomically changes the state of a std::atomic_flag to set (true) and returns the value it held before.

[edit] Parameters

order - the memory synchronization ordering for this operation

[edit] Exceptions

noexcept specification:  
noexcept
  

[edit] See also

atomically sets flag to false
(public member function)
atomically sets the flag to true and returns its previous value
(function)
(C++11)
defines memory ordering constraints for the given atomic operation
(typedef)