智能指针类的实现

#include <iostream>using namespace std;template <typename T>class SmartPointer{public:SmartPointer(T *p=0):poin(p),use(new size_t(1)){}SmartPointer(const SmartPointer &p){if(this!=&p){poin = p.poin;use  = p.use;++(*use);}}SmartPointer& operator=(const SmartPointer &tmp){if(poin==tmp.poin)return *this;++*tmp.use;if(--*use==0){cout<<"析构函数被调用了"<<endl;delete poin;delete use;}poin = tmp.poin;use  = tmp.use;return *this;}T& operator*(){cout<<"get in"<<endl;return *poin;}~SmartPointer(){if(--(*use)==0){cout<<"析构函数调用"<<endl;delete poin;delete use;}}    void Print(){cout<<*use<<"    "<<*poin<<endl;}private:T *poin;size_t *use;};int main(){SmartPointer<int> a(new int(4));a.Print();SmartPointer<int> c;c=a;cout<<"a........."<<endl;a.Print();cout<<"c........."<<endl;c.Print();return 0;}