_WhenAllImpl 8148 modules/highgui/src/ppltasks_winrt.h struct _WhenAllImpl _WhenAllImpl 8148 modules/videoio/src/ppltasks_winrt.hpp struct _WhenAllImpl _WhenAllImpl 8256 modules/videoio/src/ppltasks_winrt.hpp struct _WhenAllImpl<std::vector<_ElementType>, _Iterator> _WhenAllImpl 8369 modules/videoio/src/ppltasks_winrt.hpp struct _WhenAllImpl<void, _Iterator>