Can I define parametrized type or method in MIDL 3.0

Question

Hi,

I am working on WinRT/C++ project and I am wondering if there is a way to define parametrized method in MIDL runtime class.

I would like to have something simillar to the following. I simplified the code as much as possible but it should explain the point.

class ServiceFactory {

template <typename T>
T getService<T>(const hstring& serviceName);

}

ServiceFactory sf;
....

ServiceX x = sf.getService<ServiceX>("X");

In MIDL file I would expect to be able to define something like this

runtimeclass ServiceFactory {

 <type T> T getService<T>();

}

Answer 1

I am wondering if there is a way to define parametrized method in MIDL runtime class

Please refer github readme Type System Specification - Methods. Methods may not be parameterized. And this Type System Specification - Runtime Classes said Runtime classes cannot be parameterized.

Only interfaces and delegates may be parameterized. There is no syntax for defining a custom parameterized interface or delegate. All you can do is specialize an existing parameterized interface or delegate.