Hey Guys, My first post here...i'm just starting out with C++ and am stuck on a project. any advice will be appreciated...here's the code : Code: Bag::Bag(const Bag &aBag): size(aBag.size()) { if(aBag.head == NULL) head=NULL; else { head = new Node; assert(head != NULL); head->value = aBag.head->value; head->prev = NULL;//////////IS THIS CORREECT??? Node *newptr = head; for (Node *origPtr = aBag.head->next;origPtr != NULL; origPtr = origPtr->next) { newPtr->next = new Node; assert(newPtr->next != NULL); newPtr = newPtr->next; newPtr->value = origPtr->value; newPtr->prev = origPtr->prev; //////// IS THIS THE RIGHT WAY??? } newPtr->next = NULL; } } where.... struct Node { ItemType value; Node *next; Node *prev; }; Node *head; and Bag is obviously the class......i'm trying to make a copy constructor here for the doubly linked list but not sure of exactly how to link the PREV POINTER to the PREVIOUS node when a new node's copied.....can u help me out pls..thanks... ALSO IF SOME1 COULD OUTLINE AN ASSIGNMENT OPERATOR FOR THE SAME CLASS,I'D BE GREATFUL...THANKS AND TAKE CARE!
It depends on what you need to do be doing with the copy constructor but as a general solution you should even be copying the prev and next from the source node.
but isn't that what i'm already doing with newPtr->prev = origPtr->prev...?? i don't knw if it should be that or "newPtr->prev= head;" As for the copy constructor, this is the requirement we got : Copy constructor When a brand new Bag is created as a copy of an existing Bag, enough new nodes must be allocated to hold a duplicate of the original list. Thanks for the help
