Conversion examples

Shape s;Circle c;Shape* sp = &c; // OKCircle* cp = &s; // Ill-formedShape& s1 = c; // OKCircle& c1 = s; // Ill-formeds = c; // OKc = s; // Ill-formed

Shape s; Circle c; Shape* sp = &c; // OK Circle* cp = &s; // Ill-formed Shape& s1 = c; // OK Circle& c1 = s; // Ill-formed s = c; // OK c = s; // Ill-formed