inheriting of winrt::implements

[ifgotmoney]

Hello community,

in my WinUI3 project (C++/WinRT), in order to use winrt::weak_ref<> & get_weak() for events. I defined a base class as below:
class IDrawable: public winrt::implements<IDrawable, winrt::Windows::Foundation::IInspectable>
and a "derived" class as below:
class FlowLine : public winrt::implements<FlowLine,IDrawable,winrt::Windows::Foundation::IInspectable>

this pattern works fine for me with C++17 in Visual Studio Community 2022, however, when I try to change to C++20, the same code can not be compiled,
'to_abi': no matching overloaded function found

any thoughts?

[DarranRowe]

Look at how the generated code defines these things. However, as more of a hint, a runtime class never defines a dependence on or implements IInspectable directly. So your FlowLine definition should be:
class FlowLine : public winrt::implements<FlowLine,IDrawable>