Why did error C3986 "signature of member contains native type" occur on public function?

Question

I added this bit of code to the BlankPage project's BlankPage.xaml.h:

	public ref class BlankPage sealed
	{
	public:
		BlankPage();

		// blankpage.xaml.h(21): error C3986: 'notAllowed': signature of member contains native type 'std::vector<T>'
		 template<typename Numeric> static     Numeric notAllowed(  const std::vector<Numeric> & data ); // 
	

	protected:
		virtual void OnNavigatedTo(Windows::UI::Xaml::Navigation::NavigationEventArgs^ e) override;

	template<typename Numeric> static     Numeric minmaxError(  const std::vector<Numeric> & data );


	};

My question: Why does notAllowed give a compiler error, and yet minmaxError compiles ok?

The only difference I see is that one is public, and the other is protected.

Where can I read about these limitations?

Answer 1

The public surface area of your WinRT type can only contain WinRT compatible types.

This is certainly implied in the "Declaration" section:

http://msdn.microsoft.com/en-us/library/windows/apps/hh699870(v=vs.110).aspx

Herb Sutter also explicitly states this in his build talk

http://channel9.msdn.com/Events/BUILD/BUILD2011/TOOL-532T

Answer 2

Thank you.  Somehow I missed this talk.