class IFoo
{
public:
  virtual void MethodA() = 0;
}

class CFoo : public IFoo
{
public:
  virtual void MethodA();
}

class CAnotherFoo : public IFoo
{
public:
  virtual void MethodA();   
}
void SomeOtherClass::CreatingFoo()
{
  IFoo* pFoo = new CFoo();
  IFoo* pAnotherFoo = new CAnotherFoo();

  UsingFoo1(pFoo);
  UsingFoo2(pAnotherFoo);
}

void SomeOtherClass::UsingFoo1(IFoo* pFoo)
{
    pFoo->MethodA();
         ^- alt-g here would know that CFoo() is where I want to be and gives me it as the option in the popup list.
}

void SomeOtherClass::UsingFoo2(IFoo* pFoo)
{
    pFoo->MethodA();
         ^- alt-g here would know that CAnotherFoo() is where I want to be and gives me it as the option in the popup list.
}