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