_ContextCallback  386 modules/videoio/src/cap_msmf.hpp #define _ContextCallback Concurrency::details::_ContextCallback
_ContextCallback  393 modules/videoio/src/cap_msmf.hpp #define _ContextCallback Concurrency_winrt::details::_ContextCallback
_ContextCallback 1078 modules/videoio/src/ppltasks_winrt.hpp     class _ContextCallback