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std::atomic_flag::test - cppreference.com

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bool test( std::memory_order order = std::memory_order_seq_cst ) const volatile noexcept;

 (1) (since C++20)

bool test( std::memory_order order = std::memory_order_seq_cst ) const noexcept;

 (2) (since C++20)

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

If order is one of std::memory_order_release and std::memory_order_acq_rel, the behavior is undefined.

Parameters

order - the memory synchronization ordering

Return value

The value atomically read.

Example

See also