Yes, you should #include <iterator>, but then the next problem is that std::vector does not have a push_front() member function.
EDIT:
But if you are trying to assign the first two elements of cat to the first two elements of vec then you do not need an iterator adapter at all. However, you must be certain that vec has at least as many elements as cat, which you are certain of in this case.
Originally Posted by Bjarne Stroustrup (2000-10-14)
