c++ pointers to operators

Question

I want to write a pointer in c++ (or in c++0x), that will points to a operator of a class lets say A or B. Is there any method to do it?

Of course there is a syntax like

Answer 1

No, you can't do this. The class type is a part of the type of the operator member function.

The type of A::operator()() is different from the type of B::operator()(). The former is of type int (A::*)() while the latter is of type int (B::*)(). Those types are entirely unrelated.

The closest you can get is by using something like the C++0x polymorphic function wrapper function (found in C++0x, C++ TR1, and Boost) and by using bind to bind the member function pointer to a class instance:

std::function<int()> _p;

A a;
_p = std::bind(&A::operator(), a);
std::cout << _p();

B b;
_p = std::bind(&B::operator(), b);
std::cout << _p();