23种设计模式之抽象工厂模式（创建型，2 AbstractFactory，c++实现）

#include <stdlib.h>#include <stdio.h>#include <iostream>
using namespace std;
class Fruit {public:
virtual void sayName() = 0;};
class SouthBanana :public Fruit {public:void sayName() {cout << "I am south banana" << endl;}};
class NorthBanana :public Fruit {public:void sayName() {cout << "I am north banana" << endl;}};
class SouthApple :public Fruit {public:void sayName() {cout << "I am south apple" << endl;}};
class NorthApple :public Fruit {public:void sayName() {cout << "I am north apple" << endl;}};
class AbstractFactory {public:virtual Fruit *createBanana() = 0;virtual Fruit *createApple() = 0;};
class SouthFactory :public AbstractFactory {public:Fruit *createBanana() {return new SouthBanana;}
Fruit *createApple() {return new SouthApple;}};
class NorthFactory :public AbstractFactory {public:Fruit *createBanana() {return new NorthBanana;}
Fruit *createApple() {return new NorthApple;}};
void main() {AbstractFactory *f = NULL;Fruit *fruit = NULL;
f = new SouthFactory;fruit = f->createBanana();fruit->sayName();delete fruit;fruit = f->createApple();fruit->sayName();delete fruit;delete f;
f = new NorthFactory;fruit = f->createBanana();fruit->sayName();delete fruit;fruit = f->createApple();fruit->sayName();delete fruit;delete f;}