Re: Link List

From:
Alan Johnson <awjcs@yahoo.com>
Newsgroups:
comp.lang.c++
Date:
Wed, 21 Feb 2007 22:37:07 -0800
Message-ID:
<iP2dnZY8HZeJp0DYnZ2dnUVZ_uygnZ2d@comcast.com>
Jack wrote:

Ok, so below is a little code I just wrote up. I am wondering when I
delete temp2, does it actually delete all the data that temp2 is
pointing to or not?

#include <iostream>

using namespace std;

struct myStruct {
    int Id;
    bool visited;
    myStruct *next;
};

int main (){
    myStruct *head = NULL;
    myStruct *temp2 = NULL;
    myStruct *temp = new myStruct;

    head = temp;
    cout << "Now creating the links\n";
    for (int i = 0; i < 10; i++){
        temp->Id = i;
        temp->visited = false;
        cout << temp->Id << " ";
        temp2 = temp;
        temp = new myStruct;
        temp2->next = temp;
    }
        //LETS SAY WE WANT TO DELETE ITEM NUMBER 6
    temp = head;
    cout << "\nNow deleting the link 6\n";
    while ( (temp->next != NULL) && (temp->Id !=5) ){
        cout << temp->Id << " ";
        temp = temp->next;
    }
    temp2 = temp->next;
    temp->next = temp->next->next;
    delete (temp2); //DOES THIS DELETE ALL THE DATA THAT
TEMP2 IS POINTING TO?

    cout << "\nNow reprinting... \n";
    temp = head;
    while(temp->next != NULL){
        cout << temp->Id << " ";
        temp = temp->next;
    }

    return 0;
}


Yes, delete first calls the objects destructor (which doesn't apply in
your example) then releases all the memory that was allocated by the
corresponding new.

--
Alan Johnson

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