std::atomic_flag::clear
Defined in header <atomic> | ||
|---|---|---|
void clear( std::memory_order order =
std::memory_order_seq_cst ) volatile noexcept;
| (1) | (since C++11) |
void clear( std::memory_order order =
std::memory_order_seq_cst ) noexcept;
| (2) | (since C++11) |
Atomically changes the state of a std::atomic_flag to clear (false). Memory is affected according to the value of order.
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 value (public member function) |
|
|
(C++11)(C++11) | atomically sets the value of the flag to false (function) |
|
(C++11) | defines memory ordering constraints for the given atomic operation (enum) |
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