std::atomic_flag_test, std::atomic_flag_test_explicit - cppreference.com
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| Defined in header |
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(1) | (since C++20) |
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(2) | (since C++20) |
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(3) | (since C++20) |
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(4) | (since C++20) |
Atomically reads the value of the *object and returns the value.
1,2) The memory synchronization order is std::memory_order_seq_cst.
3,4) The memory synchronization order is order.
If order is one of std::memory_order::release and std::memory_order::acq_rel, the behavior is undefined.
Parameters
| object | - | pointer to the atomic_flag object to read
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| order | - | the memory synchronization ordering |
Return value
The value atomically read.
Notes
| Feature-test macro | Value | Std | Feature |
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__cpp_lib_atomic_flag_test |
201907L |
(C++20) | std::atomic_flag::test
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Example
See also
| atomically returns the value of the flag (public member function of std::atomic_flag) [edit]
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