如何删除双向链表数据并将其返回？

template <class T>
class Node
{
public:
    T data;
    Node<T>* prev;
    Node<T>* next;

    // default constructor (parameterized)
    template <class T>
    Node(T value)
    {  
        data = value;
        prev = NULL;
        next = NULL;
    }
};
template <class T>
class Node
{
public:
    T d