Inheritance and method overloading

Question

Why C++ compiler gives this error? Why i can access lol() from B, but can not access rofl() [without parameters]. Where is the catch?

class A { public:    void lol(void) {}    void rofl(void) { return rofl(0);}    virtual void rofl(int x) {} };  class B : public A { public:    virtual void rofl(int x) {} };  int _tmain(int argc, _TCHAR* argv[]) {     A a;    a.lol();    a.rofl(1);    a.rofl();     B  b;    b.lol();    b.rofl(1);        b.rofl(); //ERROR -> B::rofl function does not take 0 arguments      return 0; } 

Answer 1

The B::rofl(int) 'hides' the A::rofl(). In order to have A's rofl overloads, you should declare B to be using A::rofl;.

class B : public A { public:      using A::rofl;     ... }; 

This is a wise move of C++: it warns you that you probably also need to override the A::rofl() method in B. Either you do that, or you explicitly declare that you use A's other overloads.