首先编写SmartPointer.h

#ifndef SMARTPOINTER_H#define SMARTPOINTER_Hnamespace MyLib {template
     
      class SmartPointer{protected:    T* m_pointer;public:    SmartPointer(T* p=NULL){        m_pointer = p;    }    //指针生命周期结束，主动释放空间    ~SmartPointer(){        delete m_pointer;    }    //直接赋值    SmartPointer(const SmartPointer
      
       & obj){        m_pointer =obj.m_pointer;        //同一片堆空间只能由一个指针使用        const_cast
       
        
         &>(obj).m_pointer = NULL;    }    //=赋值    SmartPointer
         
          & operator=(const SmartPointer
          
           & obj){ if(this != &obj){ delete m_pointer; m_pointer =obj.m_pointer; //同一片堆空间只能由一个指针使用 const_cast
           
            
             &>(obj).m_pointer = NULL; } return *this; } T* operator->(){ return m_pointer; } T& operator *(){ return *m_pointer; } bool isNull(){ return m_pointer == NULL; } T* get(){ return m_pointer; }};}#endif // SMARTPOINTER_H
            
           
          
         
        
       
      
     

2.  测试代码：

#include 
     
      #include 
      
       using namespace std;using namespace MyLib;class Test{public:    Test() {        cout<<"Test()"<
       
         sp = new Test();    return 0;}
       
      
     

 

运行，实现简单的智能指针功能