std::atomic_flag::atomic_flag

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atomic_flag_clearatomic_flag_clear_explicit (C++11)(C++11)
atomic_flag_testatomic_flag_test_explicit (C++20)(C++20)
atomic_flag_waitatomic_flag_wait_explicit (C++20)(C++20)
atomic_flag_notify_one (C++20)
atomic_flag_notify_all (C++20)

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std::atomic_flag

Member functions
atomic_flag::atomic_flag
atomic_flag::operator=
atomic_flag::clear
atomic_flag::test_and_set
atomic_flag::test (C++20)
atomic_flag::wait (C++20)
atomic_flag::notify_one (C++20)
atomic_flag::notify_all (C++20)

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Defined in header`<atomic>`
	(1)
atomic_flag()noexcept=default;			(since C++11) (until C++20)
constexpr atomic_flag()noexcept;			(since C++20)
atomic_flag(const atomic_flag&)= delete;		(2)	(since C++11)

Constructs a newstd::atomic_flag.

1) Trivial default constructor, initializesstd::atomic_flag to unspecified state.	(until C++20)
1) Initializesstd::atomic_flag to clear state.	(since C++20)

2) The copy constructor is deleted;std::atomic_flag is not copyable.

In addition,std::atomic_flag can be value-initialized to clear state with the expressionATOMIC_FLAG_INIT. For anatomic_flag with staticstorage duration, this guaranteesstatic initialization: the flag can be used in constructors of static objects.

[edit]See also

ATOMIC_FLAG_INIT

(C++11)

initializes anstd::atomic_flag tofalse
(macro constant)[edit]

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std::atomic_flag::atomic_flag

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