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## Class template multiset

boost::container::multiset

## Synopsis

    // In header: <boost/container/set.hpp>

    template<typename Key, typename Compare = std::less<Key>,
             typename Allocator = std::allocator<Key> >
    class multiset {
    public:
      // types
      typedef Key                                                                key_type;
      typedef Key                                                                value_type;
      typedef Compare                                                            key_compare;
      typedef Compare                                                            value_compare;
      typedef ::boost::container::allocator_traits< Allocator >::pointer         pointer;
      typedef ::boost::container::allocator_traits< Allocator >::const_pointer   const_pointer;
      typedef ::boost::container::allocator_traits< Allocator >::reference       reference;
      typedef ::boost::container::allocator_traits< Allocator >::const_reference const_reference;
      typedef ::boost::container::allocator_traits< Allocator >::size_type       size_type;
      typedef ::boost::container::allocator_traits< Allocator >::difference_type difference_type;
      typedef Allocator                                                          allocator_type;

      // construct/copy/destruct
      multiset();
      explicit multiset(const Compare &,
                        const allocator_type & = allocator_type());
      template<typename InputIterator>
        multiset(InputIterator, InputIterator, const Compare & = Compare(),
                 const allocator_type & = allocator_type());
      template<typename InputIterator>
        multiset(ordered_range_t, InputIterator, InputIterator,
                 const Compare & = Compare(),
                 const allocator_type & = allocator_type());
      multiset(const multiset &);
      multiset(BOOST_RV_REF(multiset));
      multiset(const multiset &, const allocator_type &);
      multiset(BOOST_RV_REF(multiset), const allocator_type &);
      multiset& operator=(BOOST_COPY_ASSIGN_REF(multiset));
      multiset& operator=(BOOST_RV_REF(multiset));

      // public member functions
      typedef BOOST_CONTAINER_IMPDEF(tree_t::stored_allocator_type);
      typedef BOOST_CONTAINER_IMPDEF(tree_t::iterator);
      typedef BOOST_CONTAINER_IMPDEF(tree_t::const_iterator) const;
      typedef BOOST_CONTAINER_IMPDEF(tree_t::reverse_iterator);
      typedef BOOST_CONTAINER_IMPDEF(tree_t::const_reverse_iterator) const;
      allocator_type get_allocator() const;
      stored_allocator_type & get_stored_allocator();
      const stored_allocator_type & get_stored_allocator() const;
      iterator begin();
      const_iterator begin() const;
      iterator end();
      const_iterator end() const;
      reverse_iterator rbegin();
      const_reverse_iterator rbegin() const;
      reverse_iterator rend();
      const_reverse_iterator rend() const;
      const_iterator cbegin() const;
      const_iterator cend() const;
      const_reverse_iterator crbegin() const;
      const_reverse_iterator crend() const;
      bool empty() const;
      size_type size() const;
      size_type max_size() const;
      template<class... Args> iterator emplace(Args &&...);
      template<class... Args> iterator emplace_hint(const_iterator, Args &&...);
      iterator insert(const value_type &);
      iterator insert(value_type &&);
       BOOST_MOVE_CONVERSION_AWARE_CATCH(insert, value_type, iterator, this->);
      iterator insert(const_iterator, value_type &&);
       BOOST_MOVE_CONVERSION_AWARE_CATCH_1ARG(insert, value_type, iterator,
                                              this->, const_iterator);
      iterator equal_range(const key_type &);
      std::pair< const_iterator, const_iterator >
      equal_range(const key_type &) const;

      // public data members
      const value_type & x;
    };

## Description

A multiset is a kind of associative container that supports equivalent keys (possibly contains multiple copies of the same key value) and provides for fast retrieval of the keys themselves. Class multiset supports bidirectional iterators.

A multiset satisfies all of the requirements of a container and of a reversible container, and of an associative container). multiset also provides most operations described for duplicate keys.

### `multiset` public construct/copy/destruct

1.     multiset();

   Effects: Constructs an empty multiset using the specified comparison object and allocator.

   Complexity: Constant.

2.     explicit multiset(const Compare & comp,
                         const allocator_type & a = allocator_type());

   Effects: Constructs an empty multiset using the specified comparison object and allocator.

   Complexity: Constant.

3.     template<typename InputIterator>
         multiset(InputIterator first, InputIterator last,
                  const Compare & comp = Compare(),
                  const allocator_type & a = allocator_type());

   Effects: Constructs an empty multiset using the specified comparison object and allocator, and inserts elements from the range [first ,last ).

   Complexity: Linear in N if the range [first ,last ) is already sorted using comp and otherwise N logN, where N is last - first.

4.     template<typename InputIterator>
         multiset(ordered_range_t ordered_range_, InputIterator first,
                  InputIterator last, const Compare & comp = Compare(),
                  const allocator_type & a = allocator_type());

   Effects: Constructs an empty multiset using the specified comparison object and allocator, and inserts elements from the ordered range [first ,last ). This function is more efficient than the normal range creation for ordered ranges.

   Requires: [first ,last) must be ordered according to the predicate.

   Complexity: Linear in N.

5.     multiset(const multiset & x);

   Effects: Copy constructs a multiset.

   Complexity: Linear in x.size().

6.     multiset(BOOST_RV_REF(multiset) x);

   Effects: Move constructs a multiset. Constructs *this using x's resources.

   Complexity: Constant.

   Postcondition: x is emptied.

7.     multiset(const multiset & x, const allocator_type & a);

   Effects: Copy constructs a multiset using the specified allocator.

   Complexity: Linear in x.size().

8.     multiset(BOOST_RV_REF(multiset) x, const allocator_type & a);

   Effects: Move constructs a multiset using the specified allocator. Constructs *this using x's resources.

   Complexity: Constant if a == x.get_allocator(), linear otherwise.

   Postcondition: x is emptied.

9.     multiset& operator=(BOOST_COPY_ASSIGN_REF(multiset) x);

   Effects: Makes *this a copy of x.

   Complexity: Linear in x.size().

10.     multiset& operator=(BOOST_RV_REF(multiset) x);

    Effects: this->swap(x.get()).

    Complexity: Constant.

### `multiset` public member functions

1.     typedef BOOST_CONTAINER_IMPDEF(tree_t::stored_allocator_type);

2.     typedef BOOST_CONTAINER_IMPDEF(tree_t::iterator);

3.     typedef BOOST_CONTAINER_IMPDEF(tree_t::const_iterator) const;

4.     typedef BOOST_CONTAINER_IMPDEF(tree_t::reverse_iterator);

5.     typedef BOOST_CONTAINER_IMPDEF(tree_t::const_reverse_iterator) const;

6.     allocator_type get_allocator() const;

   Effects: Returns a copy of the Allocator that was passed to the object's constructor.

   Complexity: Constant.

7.     stored_allocator_type & get_stored_allocator();

   Effects: Returns a reference to the internal allocator.

   Throws: Nothing

   Complexity: Constant.

   Note: Non-standard extension.

8.     const stored_allocator_type & get_stored_allocator() const;

   Effects: Returns a reference to the internal allocator.

   Throws: Nothing

   Complexity: Constant.

   Note: Non-standard extension.

9.     iterator begin();

   Effects: Returns an iterator to the first element contained in the container.

   Throws: Nothing.

   Complexity: Constant.

10.     const_iterator begin() const;

    Effects: Returns a const_iterator to the first element contained in the container.

    Throws: Nothing.

    Complexity: Constant.

11.     iterator end();

    Effects: Returns an iterator to the end of the container.

    Throws: Nothing.

    Complexity: Constant.

12.     const_iterator end() const;

    Effects: Returns a const_iterator to the end of the container.

    Throws: Nothing.

    Complexity: Constant.

13.     reverse_iterator rbegin();

    Effects: Returns a reverse_iterator pointing to the beginning of the reversed container.

    Throws: Nothing.

    Complexity: Constant.

14.     const_reverse_iterator rbegin() const;

    Effects: Returns a const_reverse_iterator pointing to the beginning of the reversed container.

    Throws: Nothing.

    Complexity: Constant.

15.     reverse_iterator rend();

    Effects: Returns a reverse_iterator pointing to the end of the reversed container.

    Throws: Nothing.

    Complexity: Constant.

16.     const_reverse_iterator rend() const;

    Effects: Returns a const_reverse_iterator pointing to the end of the reversed container.

    Throws: Nothing.

    Complexity: Constant.

17.     const_iterator cbegin() const;

    Effects: Returns a const_iterator to the first element contained in the container.

    Throws: Nothing.

    Complexity: Constant.

18.     const_iterator cend() const;

    Effects: Returns a const_iterator to the end of the container.

    Throws: Nothing.

    Complexity: Constant.

19.     const_reverse_iterator crbegin() const;

    Effects: Returns a const_reverse_iterator pointing to the beginning of the reversed container.

    Throws: Nothing.

    Complexity: Constant.

20.     const_reverse_iterator crend() const;

    Effects: Returns a const_reverse_iterator pointing to the end of the reversed container.

    Throws: Nothing.

    Complexity: Constant.

21.     bool empty() const;

    Effects: Returns true if the container contains no elements.

    Throws: Nothing.

    Complexity: Constant.

22.     size_type size() const;

    Effects: Returns the number of the elements contained in the container.

    Throws: Nothing.

    Complexity: Constant.

23.     size_type max_size() const;

    Effects: Returns the largest possible size of the container.

    Throws: Nothing.

    Complexity: Constant.

24.     template<class... Args> iterator emplace(Args &&... args);

    Effects: Inserts an object of type Key constructed with std::forward<Args>(args)... and returns the iterator pointing to the newly inserted element.

    Complexity: Logarithmic.

25.     template<class... Args>
          iterator emplace_hint(const_iterator hint, Args &&... args);

    Effects: Inserts an object of type Key constructed with std::forward<Args>(args)...

    Returns: An iterator pointing to the element with key equivalent to the key of x.

    Complexity: Logarithmic in general, but amortized constant if t is inserted right before p.

26.     iterator insert(const value_type & x);

    Effects: Inserts x and returns the iterator pointing to the newly inserted element.

    Complexity: Logarithmic.

27.     iterator insert(value_type && x);

    Effects: Inserts a copy of x in the container.

    Returns: An iterator pointing to the element with key equivalent to the key of x.

    Complexity: Logarithmic in general, but amortized constant if t is inserted right before p.

28.      BOOST_MOVE_CONVERSION_AWARE_CATCH(insert, value_type, iterator,
                                           this-> priv_insert);

    Effects: Inserts a copy of x in the container. p is a hint pointing to where the insert should start to search.

    Returns: An iterator pointing to the element with key equivalent to the key of x.

    Complexity: Logarithmic in general, but amortized constant if t is inserted right before p.

29.     iterator insert(const_iterator position, value_type && x);

    Effects: Inserts a value move constructed from x in the container. p is a hint pointing to where the insert should start to search.

    Returns: An iterator pointing to the element with key equivalent to the key of x.

    Complexity: Logarithmic in general, but amortized constant if t is inserted right before p.

30.      BOOST_MOVE_CONVERSION_AWARE_CATCH_1ARG(insert, value_type, iterator,
                                                this-> priv_insert, const_iterator);

    Requires: first, last are not iterators into *this.

    Effects: inserts each element from the range [first,last) .

    Complexity: At most N log(size()+N) (N is the distance from first to last)

31.     iterator equal_range(const key_type & x);

32.     std::pair< const_iterator, const_iterator >
        equal_range(const key_type & x) const;

    Effects: Equivalent to std::make_pair(this->lower_bound(k), this->upper_bound(k)).

    Complexity: Logarithmic