23 Iterators library [iterators]

23.5 Iterator adaptors [predef.iterators]

23.5.2 Insert iterators [insert.iterators]

23.5.2.1 Class template back_­insert_­iterator [back.insert.iterator]

namespace std {
  template<class Container>
  class back_insert_iterator {
  protected:
    Container* container = nullptr;

  public:
    using iterator_category = output_iterator_tag;
    using value_type        = void;
    using difference_type   = ptrdiff_t;
    using pointer           = void;
    using reference         = void;
    using container_type    = Container;

    constexpr back_insert_iterator() noexcept = default;
    constexpr explicit back_insert_iterator(Container& x);
    constexpr back_insert_iterator& operator=(const typename Container::value_type& value);
    constexpr back_insert_iterator& operator=(typename Container::value_type&& value);

    constexpr back_insert_iterator& operator*();
    constexpr back_insert_iterator& operator++();
    constexpr back_insert_iterator  operator++(int);
  };
}

23.5.2.1.1 Operations [back.insert.iter.ops]

constexpr explicit back_insert_iterator(Container& x);
Effects: Initializes container with addressof(x).
constexpr back_insert_iterator& operator=(const typename Container::value_type& value);
Effects: As if by: container->push_­back(value);
Returns: *this.
constexpr back_insert_iterator& operator=(typename Container::value_type&& value);
Effects: As if by: container->push_­back(std::move(value));
Returns: *this.
constexpr back_insert_iterator& operator*();
Returns: *this.
constexpr back_insert_iterator& operator++(); constexpr back_insert_iterator operator++(int);
Returns: *this.

23.5.2.1.2 back_­inserter [back.inserter]

template<class Container> constexpr back_insert_iterator<Container> back_inserter(Container& x);
Returns: back_­insert_­iterator<Container>(x).