C/C++ Doubly Linked List

Contributed by William_Wilson June 25, 2006  
Tagged: C programming

The implementation of a doubly linked list, remove prev pointer for a singly linked list


struct Node{
public:
Member* info; //type is arbitrary, to the linked list implementation
Node* next; //used to point to next node
Node* prev; //used to point to previous node

Node():prev(NULL),next(NULL) {} //default constructor
Node(Node* n):prev(n),next(NULL) {} //prev known constructor
Node(Node* n, Node* m):prev(n),next(m) {} //prev and next known constructor
~Node() { delete info; delete next; } //destructor
};


this list would be held by a pointer:

Node* head;
head = &(new Node(&head);//create Node which knows prev(head) and next is NULL


then each node is attatched with a similar fasion.

To search such a list use a while loop:

Node* n = head;
while(n->next){
//loop code
n = n->next;
}


Questions/Comments: william_a_wilson@hotmail.com
William. § (marvin_gohan)