What happens if you increment an iterator that is equal to the end iterator of an STL container

Question

What if I increment an iterator by 2 when it points onto the last element of a vector? In this question asking how to adjust the iterator to an STL container by 2 elements t

Answer 1

You could use the "distance" function between your iterator (it) and the iterator at vec.begin() and compare it with the vector's size (obtained by size()).

In that case your for loop would look like this:

for (vector::iterator it = vec.begin(); distance(vec.begin(), it) < vec.size(); ++it)
{
     // Possibly advance n times here.
}