Cannot use Platform::Collections::Vector in WinRT method signature

Question

When I try to make a public method with a WinRT Vector, I get an error:

void setVector(Platform::Collections::Vector<Platform::String^>^);

error C3986: 'setVector': signature of member contains native type 'std::equal_to<_Ty>'

I can write my own template class which uses a Vector on the inside.

template <typename T> public ref class MyTemplateClass sealed
{
public:
	MyTemplateClass(void){myVector = ref new Platform::Collections::Vector<T>();}
	~MyTemplateClass(void){}
	T GetAt(unsigned int i){return myVector->GetAt(i);}
	void SetAt(unsigned int index, T item){myVector->SetAt(index, item);}
	void Append(T item){myVector->Append(item);}
private:
	Platform::Collections::Vector<T>^ myVector;
};

then use

void setVector(MyTemplateClass<Platform::String^>^);

But this seems rather silly, no?

One more observation. This:

template <typename X> public ref class MyOtherClass sealed
{
public:
	MyOtherClass(void){}
	~MyOtherClass(void){}
	void setVector(Platform::Collections::Vector<Platform::String^>^ vector);
};

compiles.  This:

public ref class MyOtherClass sealed
{
public:
	MyOtherClass(void){}
	~MyOtherClass(void){}
	void setVector(Platform::Collections::Vector<Platform::String^>^ vector);
};

gives the same C3986 error.  What's the real difference?  Both seem like a valid use.

Answer 1

Ah I think I found the answer.

Use Windows::Foundation::Collections::IVector when passing the reference.

http://msdn.microsoft.com/en-us/library/windows/apps/hh441569(v=vs.110).aspx (See "Collections and Arrays")

Answer 2

Thanks for sharing the solution.

Best regards,
Jesse

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Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 3

This is the reason. Fixed my problem.