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/* Template version of figure hierarchy */
#include <iostream>
#include <cstdlib>
#include <typeinfo>
using namespace std;

template <class T> class figure {
protected:
    T x, y;
public:
    figure(T i, T j) {
        x = i;
        y = j;
    }
    virtual T area() = 0;
};

template <class T>  class triangle : public figure<T> {
public:
    triangle(T i, T j) : figure<T>(i, j) {}
    T area() {
        return figure<T>::x * 0.5 * figure<T>::y;
    }
};

template <class T> class rectangle : public figure<T> {
public:
    rectangle(T i, T j) : figure<T>(i, j) {}
    T area() {
        return figure<T>::x * figure<T>::y;
    }
};

template <class T> class circle : public figure<T> {
public:
    circle(T i, T j = 0) : figure<T>(i, j) {}
    T area() {
        return 3.14 * figure<T>::x * figure<T>::x;
    }
};

/* Fabric of objects of class figure */
figure<double> *generator() {
    switch (rand() % 3) {
    case 0: return new circle<double>(10.0);
    case 1: return new triangle<double>(10.1, 5.3);
    case 2: return new rectangle<double>(4.3, 5.7);
    }
    return 0;
}

int main() {
    figure<double> *p; /* pointer to the base class */
    int i;
    int t = 0, r = 0, c = 0;

    /* generating and counting objects */
    for (i = 0; i < 10; i++) {
        p = generator(); /* generating object */
        cout << "Object has type " << typeid(*p).name();
        cout << ". ";

        /* keeping this object in mind */
        if (typeid(*p) == typeid(triangle<double>)) t++;
        if (typeid(*p) == typeid(rectangle<double>)) r++;
        if (typeid(*p) == typeid(circle<double>)) c++;

        /* Output square of the figure */
        cout << "The square of the figure is" << p->area() << endl;
    }

    cout << endl;
    cout << "There was generated next objects:\n";
    cout << "  triangles: " << t << endl;
    cout << "  rectangles: " << t << endl;
    cout << "  circles: " << c << endl;

    return 0;
}