1 #include <iostream>
2 #include <string>
3
4 using namespace std;
5
6
7 class COperator
8 {
9 public:
10 virtual double GetResult()=0;
11
12 public:
13 COperator()
14 {
15 }
16 COperator(double number_a, double number_b): m_numberA(number_a), m_numberB(number_b)
17 {
18 }
19 double m_numberA;
20 double m_numberB;
21 };
22
23
24 class CSub: public COperator
25 {
26 public:
27 CSub()
28 {
29 }
30 CSub(double number_a, double number_b): COperator(number_a, number_b)
31 {
32 }
33 virtual double GetResult();
34 };
35
36 double CSub::GetResult()
37 {
38 return this->m_numberA - this->m_numberB;
39 }
40
41
42 class CAdd: public COperator
43 {
44 public:
45 CAdd()
46 {
47 }
48 CAdd(double number_a, double number_b): COperator(number_a, number_b)
49 {
50 }
51 virtual double GetResult();
52 };
53
54 double CAdd::GetResult()
55 {
56 return m_numberA + m_numberB;
57 }
58
59
60 class CFactory
61 {
62 public:
63 static COperator* CreateOperation(char sOpeType);
64 };
65
66 COperator* CFactory::CreateOperation(char sOpeType)
67 {
68 switch(sOpeType)
69 {
70 case '-':
71 return new CSub();
72 break;
73 case '+':
74 return new CAdd();
75 break;
76 default:
77 break;
78 }
79 }
80
81
82 int main(void)
83 {
84 COperator* oper = CFactory::CreateOperation('-');
85 oper->m_numberA = 10;
86 oper->m_numberB = 20;
87 cout<< "oper->m_numberA: "<< oper->m_numberA<< endl;
88 cout<< "oper->m_numberB: "<< oper->m_numberB<< endl;
89 cout<< oper->GetResult()<< endl;
90
91 return 0;
92 }
93 ////////////////////////
94 [root]$ ./2_simple_factory
95 oper->m_numberA: 10
96 oper->m_numberB: 20
97 -10
