1 template <typename T> 2 class AutoPtr{ 3 public: 4     explicit AutoPtr(T* ptr)//拒绝隐式转换 5         :ptr(ptr){} 6     AutoPtr(AutoPtr<T>& that) 7         :ptr(that.release()){} 8     AutoPtr& operator=(AutoPtr<T>& that){ 9         if(&that != this)//证同10             ptr = that.release();//并不需要在 证同测试，因为 AutoPtr的两个构造函数决定了 他们不可能会相等。11         return *this;12     }13     ~AutoPtr(){14         if(ptr){15             delete ptr;16             ptr = NULL;17         }18     }19     T& operator* (){20         return *this->ptr;21     }22     T* operator->(){23         return &**this;24     }25 private:26     T* release(){27         T* p = ptr;28         ptr = NULL;29         return p;30     }31     T* ptr;32 };