1 #ifndef _SINGLETON_H_
 2 #define _SINGLETON_H_
 3 
 4 class Singleton
 5 {
 6 private:
 7     static Singleton* pInstance;//静态成员，保存对象的唯一实例
 8     Singleton();//私有化构造函数，使其无法在类外实例化
 9 public:
10     static Singleton* Instance();
11     //void Destroy();
12     static void Destroy();
13 };
14 
15 #endif

 1 #include "Singleton.h"
 2 #include <iostream>
 3 
 4 using namespace std;
 5 
 6 Singleton* Singleton::pInstance = NULL;
 7 
 8 Singleton::Singleton()
 9 {
10     cout<< "Singleton..." << endl;
11 }
12 
13 Singleton* Singleton::Instance()
14 {
15     if(NULL == pInstance)
16     {
17         pInstance = new Singleton();
18     }
19     return pInstance;
20 }
21 
22 void Singleton::Destroy()
23 {
24     delete pInstance;
25     pInstance = NULL;
26     cout<< "Destroy..." << endl;
27 }

 1 #include "Singleton.h"
 2 #include <iostream>
 3 
 4 using namespace std;
 5 
 6 int main()
 7 {
 8     Singleton* ps = Singleton::Instance();//通过全局访问点获取实例
 9     Singleton::Destroy();
10     return 0;
11 }