Implementing interface by templates

Question

I have this interface:

struct I
{
    virtual void f(int) = 0;
    virtual void f(float) = 0;
};

May I implemnt I using something similar to next class?

struct C : public I
{
    template<typename T>
    void f(T);
};

Answer 1

No, you can't do that. The template method overloads the original two methods (ie it's a different method with the same name). C still has two pure virtual functions.

Answer 2

As properly pointed out by NPE, you can't do this directly. However, you still can avoid code duplication by delegation:

struct C : public I
{
    void f(int x) { f_internal(x); }
    void f(float x) { f_internal(x); }

private:
    template<typename T>
    void f_internal(T x) { do stuff with x; }
};