SVG_Polimorph

void Polymorph() {
    using namespace std;
        {
            Circle c;
            Object& obj = c;

            obj.Render(cout);
            cout << endl;
        } {
            Polyline p;
            Object& obj = p;

            obj.Render(cout);
            cout << endl;
        } {
            Text t;
            Object& obj = t;

            obj.Render(cout);
        }
    }

<circle cx="0" cy="0" r="1" />

<polyline points="" />

<text x="0" y="0" dx="0" dy="0" font-size="1"></text>