delete dynamically allocated memory in a list?

[akywy]

Two questions about the following code sample:

--- code begins ---
//class IPv4 is defined elsewhere

list<IPv4> ip_list;

for (int i=1; i<=9; i++) {
char addr[128];
sprintf(addr, "%d.%d.%d.% d", i,i,i,i);

//IPv4 new_ip(addr);
//ip_list.push_ba ck(new_ip);
ptr = new IPv4(addr);
ip_list.push_ba ck(*ptr);
}

...

list<IPv4>::ite rator k;
k = ip_list.begin() ;
while (k!=pp_list.end ()) {
delete &pp_list.front( );
pp_list.pop_fro nt();
k = pp_list.begin() ;
}

--- code ends ---
When I try to free the memory using delete, the program run into error saying "double free or corruption". I don't know why. How am I supposed to delete the dynamically allocated memory in a list?

By the way, if I use the two statement that are currently commented in the first for loop instead of the two statements below them, I don't need to worry about freeing the memory, right?

Thanks!

[D_C]

Why do you have two lists, ip_list and pp_list? Also, you delete the pointer to the first list element, then instruct the program to remove the first list element whose pointer you just deleted? Why?