Question

I have an std::vector, and I want a separate std::vector containing only the last n elements of the original vector. Besides a loop over the entire vector inserting one-by-one, is there a cleaner way of doing this?

Answer 1

int n = 5;
std::vector<int> x = ...;
std::vector<int> y(x.end() - n, x.end());

Of course, this will crash and burn if x.size() < n

To elaborate a little, std::vector (like most of the standard library containers) has a constructor which takes a pair of iterators. It fills the vector with all the items from the first iterator up to the second.