std::atomic_flag_clear, std::atomic_flag_clear_explicit - cppreference.com (original) (raw)
| Defined in header | ||
|---|---|---|
| void atomic_flag_clear( volatile std::atomic_flag* obj ) noexcept; | (1) | (since C++11) |
| void atomic_flag_clear( std::atomic_flag* obj ) noexcept; | (2) | (since C++11) |
| void atomic_flag_clear_explicit( volatile std::atomic_flag* obj, std::memory_order order ) noexcept; | (3) | (since C++11) |
| void atomic_flag_clear_explicit( std::atomic_flag* obj, std::memory_order order ) noexcept; | (4) | (since C++11) |
Atomically changes the state of the std::atomic_flag pointed to by obj to clear (false).
3,4) The memory synchronization ordering is order.
[edit] Parameters
| obj | - | pointer to std::atomic_flag to access |
|---|---|---|
| order | - | the memory synchronization ordering |
[edit] Notes
std::atomic_flag_clear and std::atomic_flag_clear_explicit can be implemented as obj->clear() and obj->clear(order) respectively.
[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 |