template <class ForwardIterator, class UnaryPredicate>
ForwardIterator remove_if (ForwardIterator first, ForwardIterator last,
UnaryPredicate pred)
{
ForwardIterator result = first;
while (first!=last) {
if (!pred(*first)) {
*result = std::move(*first);
++result;
}
++first;
}
return result;
}
