std::atomic_flag_test, std::atomic_flag_test_explicit

Defined in header <atomic>
(1) (since C++20)
bool atomic_flag_test( const volatile std::atomic_flag* object ) noexcept;
bool atomic_flag_test( const std::atomic_flag* object ) noexcept;
(2) (since C++20)
bool atomic_flag_test_explicit( const volatile std::atomic_flag* object, 
                                std::memory_order order ) noexcept;
bool atomic_flag_test_explicit( const std::atomic_flag* object, 
                                std::memory_order order ) noexcept;

Atomically reads the value of the *object and returns the value.

1) Equivalent to object->test(std::memory_order_seq_cst).
2) Equivalent to object->test(order).


object - pointer to the atomic_flag object to read
order - the memory synchronization ordering for this operation: must not be std::memory_order::release or std::memory_order::acq_rel

Return value

The value atomically read.


Feature-test macro


See also

atomically returns the value of the flag
(public member function of std::atomic_flag)

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