struct Model {
bool full_tree;
virtual Model* clone() const =0;
virtual const char *name() const =0;
virtual ~Model() {}
};
struct R: virtual public Model {
virtual R* clone() const =0;
};
struct A: virtual public Model {
virtual A* clone() const=0;
};
struct RA: public R, public A {
virtual RA* clone() const=0;
};
static const char *string = "EQU";
struct EQU: public RA {
virtual EQU* clone() const {return new EQU(*this);}
const char *name() const {return string;}
};
int main() {
Model* M1 = new EQU();
Model* M2 = M1->clone();
Model* M3 = M2->clone();
if (M1->name () != string)
return 1;
if (M2->name () != string)
return 2;
if (M3->name () != string)
return 3;
return 0;
}