template模式

 1 #include <iostream>
 2 using namespace std;
 3 class AbstractClass {
 4 public:
 5     AbstractClass() {
 6     }
 7     virtual ~AbstractClass() {
 8     }
 9 // 这个函数中定义了算法的轮廓
10     void TemplateMethod();
11 protected:
12 // 纯虚函数,由派生类实现之
13     virtual void PrimitiveOperation1() = 0;
14     virtual void PrimitiveOperation2() = 0;
15 };
16 // 继承自AbstractClass,实现算法
17 class ConcreateClass: public AbstractClass {
18 public:
19     ConcreateClass() {
20     }
21     virtual ~ConcreateClass() {
22     }
23 protected:
24     virtual void PrimitiveOperation1();
25     virtual void PrimitiveOperation2();
26 };
27 
28 void AbstractClass::TemplateMethod() {
29     PrimitiveOperation1();
30     PrimitiveOperation2();
31 }
32 void ConcreateClass::PrimitiveOperation1() {
33     cout << "PrimitiveOperation1 by ConcreateClass\n";
34 }
35 void ConcreateClass::PrimitiveOperation2() {
36     cout << "PrimitiveOperation2 by ConcreateClass\n";
37 }
38 
39 int main() {
40     AbstractClass* pConcreateClass = new ConcreateClass;
41     pConcreateClass->TemplateMethod();
42     delete pConcreateClass;
43     return 0;
44 }