CC++: C++ for Comandos II

declarations class Aabstract -- virtual void f() = 0 ; ; class Babstract: public virtual Aabstract -- virtual void f() = 0; ; class Cabstract: public virtual Aabstract -- virtual void f() = 0; ; Implementation Declaration class Aimplementation : public virtual Aabstract -- virtual void f () -- ; class Bimplementation : public virtual Babstract, public virtual Aimplementation -- virtual void f () -- ; class Cimplementation : public virtual Cabstract, public virtual Aimplementation -- virtual void f () -- ; Figure 1: In this figure note the public and virtual subclassing attributes, mean respectively that there is a subtype relationship and that the base class is included only once in the hierarchy. Note also the virtual void f() = 0; which is a pure virtual function, designates an abstract class in CC++ Using this design methodology and ensuring that implementation classes are only used in instance creation most of Comandos functionality of separate hierarchies can be achievable in C..