Listing 2. Header and Source File for Circle Class
#ifndef __CIRCLE_H
#define __CIRCLE_H
#include "shape.hh"
class circle : public shape {
public:
void draw();
};
#endif // __CIRCLE_H
#include <iostream> #include "circle.hh"
void circle::draw(){
// simple ascii circle<\n>
cout << "\n";
cout << " ****\n";
cout << " * *\n";
cout << " * *\n";
cout << " * *\n";
cout << " * *\n";
cout << " * *\n";
cout << " ****\n";
cout << "\n";
}
extern "C" {
shape *maker(){
return new circle;
}
class proxy {
public:
proxy(){
// register the maker with the factory
factory["circle"] = maker;
}
};
// our one instance of the proxy
proxy p;
}
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