The cppwinrt project focused to consume Microsoft provided OS winrt components and it doesn’t support building a winrt component(yet) although they mentioned it will be supported later.

Even though it’s not technically supported yet, we still can create a winrt component with WRL(pure C++ and non C++/CX) and still can get some benefits from using cppwinrt within WRL component.

For example, I created a WinRT sample component with WRL and exports IAsyncAction async methods from it. Inside the method, I utilized the cppwinrt provided coroutine method which easily can produce IAsync operations. See the following:

https://github.com/heejune/wrl-cppwinrt-sample/blob/async-support/SampleLib.Shared/DemoCore.cpp

There’s a DemoCore::GetCppwinrtDataasync method defined as this:

It just (detached and) returns the object which also returned from GetAsyncOp private method. GetAsyncOp is a coroutine function which also creates an instance of winrt::Windows::Foundation::IAsyncOperation. And that’s the winrt implementation of IAsyncOperation.

You can download the source project and test it from https://github.com/heejune/wrl-cppwinrt-sample/tree/async-support

Thanks,

Heejune