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

Perhaps you should have something like this:

template 
Itr safe_advance(Itr i, Itr end, size_t delta)
{
    while(i != end && delta--)
        i++;
    return i;
}

You can overload this for when iterator_category is random_access_iterator to do something like the following:

return (delta > end - i)? end : i + delta;