The dereference prefix operator * being applied to iterator returns the lvalue reference to the element pointed by the iterator. Therefore, algorithms such as std::copy or std::transform calls copying constructors of processed elements, for example:
However it’s possible to force algorithms to call moving constructors when it’s appropriate for performance reasons by using the special adapter called std::move_iterator provided by the standard library. This adapter class defines the dereference operator * in such a way that it returns the rvalue (rather than lvalue) reference to the element pointer by the iterator. The object of type std::move_iterator can be conveniently created by the function std::make_move_iterator that deduces the underlying type of the iterator object from it’s argument automatically, for example: