std::atomic_flag::clear
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< cpp | atomic | atomic flag
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std::atomic_flag
Member functions
atomic_flag::clear
(C++20)
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Defined in header
<atomic>
void clear( std::memory_order order =
std::memory_order_seq_cst ) volatile noexcept;
(1)
(since C++11)
std::memory_order_seq_cst ) volatile noexcept;
void clear( std::memory_order order =
std::memory_order_seq_cst ) noexcept;
(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.
[edit] Parameters
order
-
the memory synchronization ordering
[edit] 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 |