1 /*利用享元模式买衬衫的程序案例
2 需求：1、库存无某种颜色衬衫时，需要对该颜色衬衫进行进货（列表中无该属性的对象时，新建立该属性对象，再调用）
3 2、库存中有该对象时，直接售卖不用进货（列表中有该属性的对象时，直接调用）
4 程序注解：库存使用map实现的
5 售卖等行为是用cout<<相应的话语模拟实现的
6 */
7 #include<iostream>
8 #include<string>
9 #include<map>
10 using namespace std;
11
12 //抽象享元类
13 class FlyWeight
14 {
15 public:
16 void sail()
17 {
18
19 };
20 };
21
22 //具体的享元类
23 class ConcreteFlyWeight:public FlyWeight
24 {
25 public:
26 ConcreteFlyWeight(string color)
27 {
28 shirtColor = color;
29 cout<<"新入库衬衫颜色"<<shirtColor<<endl;
30 };
31 void sail()
32 {
33 cout<<"卖掉衬衫颜色为"<<shirtColor<<endl<<endl;
34 };
35 private:
36 string shirtColor;
37 };
38
39 //工厂类
40 class Factory
41 {
42 public:
43 ConcreteFlyWeight* factory(string color)
44 {
45
46 map<string, ConcreteFlyWeight*>::iterator iter = SHIRT_MAP.find(color);
47 if (iter!= SHIRT_MAP.end())
48 {
49 cout<<"库存有货"<<endl;
50 ConcreteFlyWeight *it = SHIRT_MAP[color];
51 return it;
52 }
53 else
54 { cout<<"库存无货"<<endl;
55 ConcreteFlyWeight *m_Color=new ConcreteFlyWeight(color);
56 SHIRT_MAP.insert(map<string, ConcreteFlyWeight*>::value_type(color,m_Color));
57 ConcreteFlyWeight *it = SHIRT_MAP[color];
58 return it;
59 }
60
61 }
62 private:
63 map<string, ConcreteFlyWeight*>SHIRT_MAP;
64 };
65
66 //主函数
67 int main()
68 {
69 Factory m_factory;
70
71 cout<<"1号顾客买红色衬衫"<<endl;
72 ConcreteFlyWeight *m_ConcreteFlyWeight1=m_factory.factory("Red");
73 m_ConcreteFlyWeight1->sail();
74
75 cout<<"2号顾客买蓝色衬衫"<<endl;
76 ConcreteFlyWeight *m_ConcreteFlyWeight2=m_factory.factory("Blue");
77 m_ConcreteFlyWeight2->sail();
78
79 cout<<"3号顾客买红色衬衫"<<endl;
80 ConcreteFlyWeight *m_ConcreteFlyWeight3=m_factory.factory("Red");
81 m_ConcreteFlyWeight3->sail();
82
83 getchar();//停留输出界面，按任意键结束
84 return 0;
85 }
