I saw this as part of https://docs.microsoft.com/en-us/windows/uwp/cpp-and-winrt-a... (and the previous cppwinrt github project) but I haven't dug too deeply. I wonder if the restrictions are too limiting. Any bare-bones win32 example of using it in a simple cpp file? I plan on doing a poc myself soon.
Using WinRT stuff in a Win32 app is quite simple. Add windowsapp.lib, #include "winrt/Windows.Foundation.h", and call winrt::init_apartment();. There's no easy way to embed Xaml controls, though. I think the only option would be to have a separate Xaml window, get its HWND, and SetWindowLong+SetParent to force it to be a child window.
