How to implement interfaces in C++?

Question

OOP

Are interfaces in C++ a class where only pure virtual functions?

Answer 1

Yes. An interface in C++ is an abstract class that contains only abstract methods.

Answer 2

class Interface
{
virtual void add_ref() = 0;
virtual void release() = 0;
virtual void get_interface(IID iid, void** pInterface) = 0;
};