Overriding C++ virtual methods with multiple signatures [duplicate]

Answer 1

In the derived class, add

using base::myMethod;

Answer 2

Your definition is hiding the definition from the base class. In order for that definition to be visible at your derived scope, you need using base::myMethod.

class derived : public base
{
public:
  using base::myMethod; // <--- here

#if SPECIALIZE_ONEARG
  virtual int myMethod( char a )         { return 3; }
#endif // SPECIALIZE_ONEARG

#if PASSTHRU_TWOARG
  virtual int myMethod( char a, int b )  { return base::myMethod( a, b ); }
#endif // PASSTHRU_TWOARG
};