智能指针（指向转移写法）

#include<iostream>using namespace std;template<class T>class auto_ptr{public:explicit auto_ptr(T* p = 0):pointee(p) {}   //默认参数的构造函数 auto_ptr(auto_ptr<T>& rhs): pointee(rhs.release()) {}  ~auto_ptr()  {   delete pointee;  }   auto_ptr<T>&  operator=(auto_ptr<T>& rhs)  {       if(this != &rhs)   {            reset(rhs.release());   }   return(*this);  }  T& operator*() const  {       return(*pointee);  }  T* operator->() const  {       return(pointee);  }  T* get() const  {       return(pointee);  }  T* release()  {      T* oldPointer = pointee;  pointee = 0;  return(oldPointer);  }  void reset(T *p = 0)  {  if(pointee != p)  {  delete pointee;      pointee = p;  }  }private:T* pointee;};struct pt{int x,y;    pt(int a,int b):x(a),y(b) {}};int main(){    auto_ptr<pt> p(new pt(4,5));    auto_ptr<int> p2(new int);p2 = p;cout << p->x << endl;    auto_ptr<pt> p1 = p;cout << p1->x << endl;return(0);}