#include <stdio.h>#include <iostream>#include <g2_PS.h>#include <g2.h>/* A very simple example to demonstrate g2 in a C++ environment */class Circle{public:  Circle(int d, double x, double y, double r)    : _d(d), _x(x), _y(y), _r(r)  {    g2_circle(d, x, y, r);    g2_flush(d);  }  void Fill()  {    g2_filled_circle(_d, _x, _y, _r);    g2_flush(_d);  }private:  int _d;  double _x, _y, _r;};int main(int argc, char *argv[]){    int d;    d=g2_open_PS("demo_cpp.ps", g2_A4, g2_PS_port);    Circle c(d, 150, 150, 25);    c.Fill();    Circle c2(d, 150, 175, 25);    g2_close(d);    std::cout << "demo_cpp.ps generated\n";    return 0;}