explicit front_insert_iterator(Container& x);
front_insert_iterator& operator=(const typename Container::value_type& value);
front_insert_iterator& operator=(typename Container::value_type&& value);
front_insert_iterator& operator*();
front_insert_iterator& operator++();
front_insert_iterator operator++(int);
template <class Container>
front_insert_iterator<Container> front_inserter(Container& x);