NAME

std::atomic_flag::atomic_flag - std::atomic_flag::atomic_flag

Synopsis

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

Constructs a new std::atomic_flag.

1) Trivial default constructor, initializes std::atomic_flag to (until C++20)
unspecified state.
1) Initializes std::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
expression ATOMIC_FLAG_INIT. For an atomic_flag with static storage duration, this
guarantees static initialization: the flag can be used in constructors of static
objects.
This macro is deprecated.
(since C++20)

See also

ATOMIC_FLAG_INIT initializes an std::atomic_flag to false
(C++11) (macro constant)