我有一个模板数组包含保存数据的单元格，在代码中描述：
template <class T>
class Array
{
private:
//the array is consist cellss that holds the data
template<class S>
class Cell
{
public:
//members:
S* m_data;
//methods:
//C'tor:(inline)
Cell(S* data=NULL): m_data(data){};
//D'tor:(inline)
~Cell(){delete m_data;};
//C.C'tor:(inlnie)
Cell(const Cell<S>& cell): m_data(cell.m_data){};
};
private:
//members of Array:
Cell<T>* m_head,*m_last;
unsigned int m_size;
public:
/*******************C'tors and D'tors************************/
//C'tor:(inline)
Array():m_head(NULL),m_last(NULL), m_size(0){};
//D'tor:
~Array(){delete[] m_head;};
//C.C'tor:
Array(const Array& array): m_head(array.m_head),m_last(array.m_last),m_size(array.m_size){};
/****************Adding********************/
//add an element to the end of the Array:
void add(const T added);
/*******************Returning and deleting***********************/
T& operator[](const unsigned int index)const {return *(m_head[index].m_data);};
//delete the last element:
void remove();
/*********************Size*****************************/
//returning the number of elements:(inline)
const unsigned int size()const{return m_size;};
//check if the Array is empty:
bool isEmpty()const {return (m_size==0);};
};
现在这是 add 的实现：（经过测试看起来它工作正常，但只是为了以防万一我也在这里写）
template <class T>void Array<T>::add(const T added)
{
//allocating memory for the new array:
Cell<T>* newarray=new Cell<T>[m_size+1];
//copy all the elements from the old array:
unsigned int i;
for (i=0; i<m_size;i++)
newarray[i].m_data=m_head[i].m_data;
//put the added in the last index:
T* newelement= new T(added);
newarray[i].m_data=newelement;
//change the ptrs:
m_head=newarray;
m_last=&newarray[m_size];
//increase the counter:
m_size++;
}
这是删除的实现：
template <class T>void Array<T>::remove()
{
//if there is only 1 element:
if(m_size==1)
{
delete[] m_head;
m_head=m_last=NULL;
}
//change the last the previus cell
else
{
delete m_last;
m_last=m_last-1;
}
//and decrease the counter:
m_size--;
}
现在什么时候做：
Array<int> a;
a.add(3);//work fine
a.add(4);//work fine
a.remove();//fail
delete m_last;即使 m_last 指向一个实际保存数据的单元格（m_last 指向一个单元格保存 4），我也从该行收到运行时错误。我在这里想念什么？为什么我不能删除指向数组中单元格的指针？
错误 VS2012 给我：_BLOCK_TYPE_IS_VAILED(pHead->nBlockUse)
另一件重要的事情我忘了说：调试时它根本没有进入 Cell 的 D'tor，它只是在去删除时才出来。