std::atomic_flag::clear
From cppreference.com
< cpp | atomic | atomic flag
| Defined in header <atomic>
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| void clear( std::memory_order order = std::memory_order_seq_cst ) volatile noexcept; |
(1) | (since 哋它亢++11) |
| void clear( std::memory_order order = std::memory_order_seq_cst ) noexcept; |
(2) | (since 哋它亢++11) |
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 哋它亢++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 2138 | 哋它亢++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) | |
| (哋它亢++11)(哋它亢++11) |
atomically sets the value of the flag to false (function) |
| (哋它亢++11) |
defines memory ordering constraints for the given atomic operation (enum) |