NAME¶

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

Synopsis¶

Defined in header <atomic>
void clear( std::memory_order order = (1) (since C++11)
std::memory_order_seq_cst ) volatile noexcept;
void clear( std::memory_order order = (2) (since C++11)
std::memory_order_seq_cst ) noexcept;

Atomically changes the state of a std::atomic_flag to clear (false).

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

Parameters¶

order - the memory synchronization ordering

Defect reports

The following behavior-changing defect reports were applied retroactively to
previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 2138 C++11 order could be std::memory_order_consume the behavior is
undefined in this case

See also¶

atomically sets the flag to true and obtains its previous
test_and_set value
(public member function)
atomic_flag_clear
atomic_flag_clear_explicit atomically sets the value of the flag to false
(C++11) (function)
(C++11)
memory_order defines memory ordering constraints for the given atomic
(C++11) operation
(enum)