auto_ptr 源码

template <typename _Tp>class auto_ptr{private:_Tp *m_ptr;public:typedef _Tp elementType;// object life cycleexplicit auto_ptr(elementType *p) throw():m_ptr(p){}auto_ptr(auto_ptr &a) throw():m_ptr(a.release()){}template <typename _Tp1>auto_ptr(auto_ptr<_Tp1> &a) throw() : m_ptr(a.release()){}auto_ptr& operator= (auto_ptr& a) throw(){reset(a.release());return *this;}template <typename _Tp1>auto_ptr& operator=(auto_ptr<_Tp1> &a) throw(){reset(a.release());return *this;}~auto_ptr(){delete m_ptr;}// operator overrideelementType& operator*() const throw(){assert(m_ptr != 0);return *m_ptr;}elementType* operator->() const throw(){assert(m_ptr != 0);return m_ptr;}// helper elementType* get() const throw(){return m_ptr;}elementType* release() throw(){elementType *tmp = m_ptr;m_ptr = 0;return tmp;}void reset(elementType *p = 0) throw(){if (p != m_ptr){delete m_ptr;m_ptr = p;}}};