C++的单例模式

1:  

       2: #ifndef __SINGLETON_H__

       3: #define __SINGLETON_H__

       4:  

       5: #include <memory>

       6:  

       7: template<class T>

       8: class SingleT

       9: {

      10: public:

      11:     static T * Instance()

      12:     {

      13:         if (!p)

      14:         {

      15:             p = new T;

      16:         }

      17:  

      18:         return p;

      19:     }

      20:  

      21:     static void Create()

      22:     {

      23:         if (!p)

      24:         {

      25:             p = new T;

      26:         }

      27:     }

      28:  

      29:     static void Destroy()

      30:     {

      31:         if (p)

      32:         {

      33:             delete p;

      34:             p = NULL;

      35:         }

      36:     }

      37:  

      38:     static T * Get()

      39:     {

      40:         return p;

      41:     }

      42:  

      43:     static void Reset()

      44:     {

      45:         Destroy();

      46:         Create();

      47:     }

      48:  

      49: protected:

      50:     static T * p;

      51: };

      52:  

      53: template <class T>

      54: T * SingleT<T>::p = NULL;

      55:  

      56: #endif

      57:

1:  

       2: #ifndef __SINGLETONTEST_H__

       3: #define __SINGLETONTEST_H__

       4:  

       5: #include "Singleton.h"

       6:  

       7: #include <iostream>

       8:  

       9: class SingletonTest : public SingleT<SingletonTest>

      10: {

      11: public:

      12:     SingletonTest(){};

      13:     ~SingletonTest(){};

      14:     

      15: public:

      16:     inline void test() {std::cout<<"test()"<<std::endl;}

      17: };

      18:  

      19: #endif