Singleton 单例模板

 // singleton.h

 #ifndef SINGLETON_H

 #define SINGLETON_H

 // 单例基类模板

 template <class T>

 class Singleton

 {

 public:

     static T& give_me()

     {

         static T s_inst;

         return s_inst;

     }

 private:

     // 禁止实现拷贝构造与拷贝赋值函数

     explicit Singleton(const Singleton<T> &rhs);

     Singleton<T>& operator = (const Singleton<T> &rhs);

 protected:

     explicit Singleton()    {}

     virtual ~Singleton()    {}

 };

 #endif // SINGLETON_H

 #ifndef TEST_MANAGER_H

 #define TEST_MANAGER_H

 #include "singleton.h"

 class TestManager : public Singleton<TestManager>

 {

     friend class Singleton<TestManager>;

 private:

     explicit TestManager();

     virtual ~TestManager();

 public:

     void func();

 };

 #endif // TEST_MANAGER_H