How do you declare an interface in C++?

Question

How do I setup a class that represents an interface? Is this just an abstract base class?

Answer 1

I'm still new in C++ development. I started with Visual Studio (VS).

Yet, no one seems to mentioned the __interface in VS (.NET). I am not very sure if this is a good way to declare an interface. But it seems to provide an additional enforcement (mentioned in the documents). Such that you don't have to explicitly specify the virtual TYPE Method() = 0;, since it will be automatically converted.

__interface IMyInterface {
   HRESULT CommitX();
   HRESULT get_X(BSTR* pbstrName);
};

However, I don't use it because I am concern about the cross platform compilation compatibility, since it only available under .NET.

If anyone do have anything interesting about it, please share. :-)

Thanks.