Re: Erasing from middle of a list problem
Angus <anguscomber@gmail.com> wrote:
If I want to erase all list items with a value of say 3 as below:
std::list<int> mylist;
mylist.push_back(3);
mylist.push_back(4);
mylist.push_back(5);
mylist.push_back(6);
for(std::list<int>::iterator it = mylist.begin(); it !=
mylist.end(); ++it) {
if(*it == 3) {
std::cout << "deleting 3" << std::endl;
mylist.erase(it);
}
}
I get an access violation in the loop iteration after an erase. What
is the recommended way to deal with this? ie iterate through a
container removing elements which meet a criterion? remove?
The answers to date missed something important.
mylist.remove( 3 );
will do exactly what you want.
The 'remove' and 'remove_if' algorithms are highly inefficient if used
on a list, there is no reason to reseat values in nodes when dealing
with a linked list.
Writing the loop yourself is wasteful in this case.
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