Factory pattern

[lhoussain]

can you explain me what means this architecture and how i can instanciate my object :

classe A {
friend class B;
friend class C;

virtual int function1()=0;
virtual int function2()=0;

}
class D{

virtual int function3(A *a , x, y)=0;

}
class B: public D{
A * a;

int function3(A* a, x, y);

}
class C: public D{
A * a;
int function3(A *a , x, y);

}

[mutexe]

You can create a B,C or D in the same way you'd normally create an object.

what does your thread title have to do with your question?

[lhoussain]

but i need to use A functions, and B,C functions too.

A *a ;

B b = new B();
b.function3(a, x, y);

C c = new C();
b.function3(a, x, y);

is this a correct implémentation ?