assign a member function to a function pointer

Question

If I have two classes like this :

class A
{
    public:
        int *(*fun)( const int &t );
        A( int *( *f )( const int &t ) ) : fun( f ) {}
};
         


        

Answer 1

this result in compiler error

Because f is a A's non-static member function returning int*, that accepts single const reference to int. That means, that its type is not:

int* (*)(const int &);

but:

int* (A::*)(const int&);

Also, your code signalizes very bad design - I think you need simple virtual function. But if you want to keep writing things this way, you may want to read: ISOCPP: Pointers to members.

Remember, that non-static member functions of type C always accepts additional implicit argument of type C* (or const C*, if function is declared with const qualifier), that points to instance of C this function was called on.