C++類模板實現數據結構——棧

以下是本人用C++類模板實現的一種數據結構——棧。希望對別人有所幫助，也希望有人給出意見！畢竟我也是很少用模板這東西，新手一個。
#ifndef _STACK_H_INCLUDED
#define _STACK_H_INCLUDED

template<typename T>
class _stack
{
public:
_stack(size_t _capacity = 1):capacity(_capacity),pArry(new T[_capacity]),length(0),pTop(pArry){}
~_stack(){delete []pArry;}
void ClearStack()
{
                       length = 0;
                       pTop = pArry;
                }

bool IsEmpty()const {return length == 0;}
size_t GetSize()const {return length;}
void Push(T& e);
T Pop()
{
   --length;
            return *(--pTop);
}
T& GetTop()const;
void vist()const;
private:
size_t capacity;
T *pArry;
size_t length;
T *pTop;
};

template<typename T>
T& _stack<T>::GetTop()const
{
if(!IsEmpty())
return *(pTop - 1);
else
return *pTop;
}

template<typename T>
void _stack<T>::Push(T &e)
{
++length;
if(length < capacity)
{
*pTop = e;
++pTop;
}
else
{
T *ptmp(new T[2*capacity]);
T *const phead(ptmp);
T *pT(pArry);
for(int i = 0; i < length; ++i)
{
*ptmp = *pT;
++ptmp;
++pT;
}
capacity *= 2;
delete []pArry;
*(++ptmp) = e;
pTop = ++ptmp;
pArry = phead;
}
}
template<typename T>
void _stack<T>::vist()const
{
T *ptmp(pTop);
while(ptmp != pArry)
{
std::cout<<*(--ptmp)<<" ";
}
}

#endif // _STACK_H_INCLUDED