orconce: Use Win32 once implementation
InitOnceBeginInitialize() is slightly faster than the manual implementation. Note that MSVC std::call_once() is implemented by using the Win32 API as well.
Edited by Seungha Yang
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InitOnceBeginInitialize() is slightly faster than the manual implementation. Note that MSVC std::call_once() is implemented by using the Win32 API as well.