Abstract Factory(抽象工廠模式)_before
# include <iostream>
using namespace std;
#define MOTIF
class Widget {
public:
virtual void draw() = 0;
};
class MotifButton : public Widget {
public:
void draw() { cout << "MotifButton\n"; }
};
class MotifMenu : public Widget {
public:
void draw() { cout << "MotifMenu\n"; }
};
class WindowsButton : public Widget {
public:
void draw() { cout << "WindowsButton\n"; }
};
class WindowsMenu : public Widget {
public:
void draw() { cout << "WindowsMenu\n"; }
};
void display_window_one() {
#ifdef MOTIF
Widget* w[] = { new MotifButton,
new MotifMenu };
#else // WINDOWS
Widget* w[] = { new WindowsButton,
new WindowsMenu };
#endif
w[0]->draw(); w[1]->draw();
}
void display_window_two() {
#ifdef MOTIF
Widget* w[] = { new MotifMenu,
new MotifButton };
#else // WINDOWS
Widget* w[] = { new WindowsMenu,
new WindowsButton };
#endif
w[0]->draw(); w[1]->draw();
}
int main( void ) {
#ifdef MOTIF
Widget* w = new MotifButton;
#else // WINDOWS
Widget* w = new WindowsButton;
#endif
w->draw();
display_window_one();
display_window_two();
system("PAUSE");
}