來自于《大話設計模式》
建造者模式（Builder）：將一個復雜對象的構建與它的表示分離，使得同樣的構建過程可以創建不同的表示。
UML 類圖：
代碼實現 C++：
1 #include <iostream>
2 #include <string>
3 #include <list>
4 using namespace std;
5
6 class Product
7 {
8 private:
9 list<string> parts;
10 public:
11 void Add(string s)
12 {
13 parts.push_back(s);
14 }
15 void Show()
16 {
17 for (list<string>::const_iterator cit = parts.begin(); cit != parts.end(); ++cit)
18 {
19 cout << *cit << endl;
20 }
21 }
22 };
23
24 class Builder
25 {
26 public:
27 Builder() {}
28 virtual ~Builder() {}
29 virtual void BuildPartA() = 0;
30 virtual void BuildPartB() = 0;
31 virtual Product* GetResult() = 0;
32 };
33
34 class ConcreteBuilder1 : public Builder
35 {
36 private:
37 Product* p;
38 public:
39 ConcreteBuilder1() : p(new Product) {}
40 virtual ~ConcreteBuilder1()
41 {
42 delete p;
43 }
44 virtual void BuildPartA()
45 {
46 p->Add("部件 A - 1");
47 }
48 virtual void BuildPartB()
49 {
50 p->Add("部件 B - 1");
51 }
52 virtual Product* GetResult()
53 {
54 return p;
55 }
56 };
57
58 class ConcreteBuilder2 : public Builder
59 {
60 private:
61 Product* p;
62 public:
63 ConcreteBuilder2() : p(new Product) {}
64 virtual ~ConcreteBuilder2()
65 {
66 delete p;
67 }
68 virtual void BuildPartA()
69 {
70 p->Add("部件 A - 2");
71 }
72 virtual void BuildPartB()
73 {
74 p->Add("部件 B - 2");
75 }
76 virtual Product* GetResult()
77 {
78 return p;
79 }
80 };
81
82 class Director
83 {
84 public:
85 void Construct(Builder& b)
86 {
87 b.BuildPartA();
88 b.BuildPartB();
89 }
90 };
91
92 int main()
93 {
94 Director d;
95 ConcreteBuilder1 b1;
96 ConcreteBuilder2 b2;
97
98 d.Construct(b1);
99 Product* p1 = b1.GetResult();
100 p1->Show();
101
102 d.Construct(b2);
103 Product* p2 = b2.GetResult();
104 p2->Show();
105
106 return 0;
107 }
posted on 2011-04-26 18:00
unixfy 閱讀(244)
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