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libstdc++
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| call_once(once_flag &__once, _Callable &&__f, _Args &&...__args) | std::once_flag | [friend] |
| once_flag() noexcept | std::once_flag | |
| once_flag(const once_flag &) | std::once_flag | |
| operator=(const once_flag &) | std::once_flag |