Compiler errors using winrt::make<>

[schlzber]

When I use the apropriate call to winrt::make<> in the constructor of my class I get compiler errors (translated from German):

musiclibrary.cpp(10): error C2672: "winrt::make": no matching overloaded function found musiclibrary.cpp(10): error C2974: "winrt::make": invalid template argument for "D", Type expected. 1>c:\program files (x86)\windows kits\10\include\10.0.17713.0\cppwinrt\winrt\base.h(8501): note: See declaration of "winrt::make"

The line in my code is this:

m_Artists = winrt::make<single_threaded_observable_vector<Windows::Foundation::IInspectable>>();

And m_Artists is defined like this: public: IVector<IInspectable> Artists(); private: IVector<IInspectable> m_Artists;

and in IDL:

    Windows.Foundation.Collections.IVector<IInspectable> Artists{ get; };

Any ideas what I'm missing?

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Document Details

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• ID: f06f7371-d17a-c3aa-c0f9-795c213c7cdc
• Version Independent ID: 551a7594-9637-4eca-2400-b14a6541ab76
• Content: XAML items controls; bind to a C++/WinRT collection - UWP app developer
• Content Source: windows-apps-src/cpp-and-winrt-apis/binding-collection.md
• Product: windows
• GitHub Login: @stevewhims
• Microsoft Alias: stwhi

[stevewhims]

Hi, @schlzber, thanks for opening this issue: it looks like I need to improve this topic. winrt::make is expecting D to be a type; and the compiler error you're seeing can happen when you supply an identifier or a function as D, instead of a type. Are you using the released version of the SDK (which is 17134), or are you using a later Insider version of the SDK (version 17661 or later)? If you're using 17661 or later, and you're not using the single_threaded_observable_vector class that's provided with the topic, then you'll be using winrt::single_threaded_observable_vector, which is a function. If that's the case then that's consistent with the compiler error. I haven't properly updated the topic to show how to use winrt::single_threaded_observable_vector, because it's still in Preview and hasn't yet been released. But there's info about it in this video: https://www.youtube.com/watch?v=nOFNc2uTmGs&feature=youtu.be&t=1h5m46s.

For folks using the released SDK (version 17134), one thing I forgot to add to the topic is that you need to #include "single_threaded_observable_vector.h" in BookstoreViewModel.h.

I'll go ahead and make these fixes to the topic asap. Please let me know if you're still blocked with the info above.

-Steve

[schlzber]

Hello Steve,

thanks for you explanation. I was using the 17713 Preview SDK. I switched back to the 17134 SDK and included the header and now it works. Thanks. :-)

Daniel

[stevewhims]

Great, thanks, Daniel!