Exercise 9.06

What is wrong with the following program? How might you correct it?

list<int> lst1;
list<int>::iterator iter1 = lst1.begin(), iter2 = lst1.end();
while (iter1 < iter2) /* ... */

Solution

List iterators cannot make use of the < operator for comparison, and must instead use != or ==:

while (iter1 != iter2) /* ... */