Hi. I would like to know the best way to initialize a constructor in a virtual base base. For example, ------------------------------------------------------------ // Base class class Base() { public: A(int i = 0); virtual void printA() const = 0; }; // Derived classes class X() : public virtual Base { public: X(char a, int j); virtual void printA(); }; X::X(char a, int j) { char temp = a; A::A(j); } class Y() : public virtual Base { public: Y(long x, int k); virtual void printA(); }; Y::Y(long x, int k) { long temp = x; A::A(k); } // Next level down in hierarchy class Z(); public X, public Y { public: Z(...?...); // What data do I need here to construct X, Y, and Base? void printA() const; ... }; Z::Z(...?...) { // Do you contruct class X, Y, or Base first? } // Implementation Z example(...?...); // You need to construct Base first. ---------------------------------------------------------- I know the question is very basic to polymorphic C++ programming. Nonetheless, it is something that want really want to understand.

Okay. Thanks.

Can you elaborate on as to what you mean about this statement?

d) You should use an initialiser list, not initialise your parameters within the constructor body.

I still would like to know how to initialize a virtual base class.

Thanks,
Kuphryn

Ohhhhhh. Yeah. The sample I type had some errors.

Thanks,
Kuphryn