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## Class template flat_multiset

boost::container::flat_multiset

## Synopsis

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

    template<typename Key, typename Compare = std::less<Key>,
             typename Allocator = std::allocator<Key> >
    class flat_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
      explicit flat_multiset();
      explicit flat_multiset(const Compare &,
                             const allocator_type & = allocator_type());
      template<typename InputIterator>
        flat_multiset(InputIterator, InputIterator, const Compare & = Compare(),
                      const allocator_type & = allocator_type());
      template<typename InputIterator>
        flat_multiset(ordered_range_t, InputIterator, InputIterator,
                      const Compare & = Compare(),
                      const allocator_type & = allocator_type());
      flat_multiset(const flat_multiset &);
      flat_multiset(BOOST_RV_REF(flat_multiset));
      flat_multiset(const flat_multiset &, const allocator_type &);
      flat_multiset(BOOST_RV_REF(flat_multiset), const allocator_type &);
      flat_multiset& operator=(BOOST_COPY_ASSIGN_REF(flat_multiset));
      flat_multiset& operator=(BOOST_RV_REF(flat_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;
      const_iterator cbegin() const;
      iterator end();
      const_iterator end() const;
      const_iterator cend() const;
      reverse_iterator rbegin();
      const_reverse_iterator rbegin() const;
      const_reverse_iterator crbegin() const;
      reverse_iterator rend();
      const_reverse_iterator rend() const;
      const_reverse_iterator crend() const;
      bool empty() const;
      size_type size() const;
      size_type max_size() const;
      size_type capacity() const;
      void reserve(size_type);
      void shrink_to_fit();
      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);
      const_iterator equal_range(const key_type &) const;
      std::pair< iterator, iterator > equal_range(const key_type &);

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

## Description

flat_multiset is a Sorted Associative Container that stores objects of type Key. flat_multiset is a Simple Associative Container, meaning that its value type, as well as its key type, is Key. flat_Multiset can store multiple copies of the same key value.

flat_multiset is similar to std::multiset but it's implemented like an ordered vector. This means that inserting a new element into a flat_multiset invalidates previous iterators and references

Erasing an element of a flat_multiset invalidates iterators and references pointing to elements that come after (their keys are equal or bigger) the erased element.

### `flat_multiset` public construct/copy/destruct

1.     explicit flat_multiset();

   Effects: Default constructs an empty `flat_multiset`.

   Complexity: Constant.

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

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

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

   Effects: Constructs an empty `flat_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.

   Note: Non-standard extension.

5.     flat_multiset(const flat_multiset & x);

   Effects: Copy constructs a `flat_multiset`.

   Complexity: Linear in x.size().

6.     flat_multiset(BOOST_RV_REF(flat_multiset) mx);

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

   Complexity: Constant.

   Postcondition: x is emptied.

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

   Effects: Copy constructs a `flat_multiset` using the specified allocator.

   Complexity: Linear in x.size().

8.     flat_multiset(BOOST_RV_REF(flat_multiset) mx, const allocator_type & a);

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

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

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

   Effects: Makes *this a copy of x.

   Complexity: Linear in x.size().

10.     flat_multiset& operator=(BOOST_RV_REF(flat_multiset) mx);

    Effects: Makes *this a copy of x.

    Complexity: Linear in x.size().

### `flat_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.     const_iterator cbegin() const;

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

    Throws: Nothing.

    Complexity: Constant.

12.     iterator end();

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

    Throws: Nothing.

    Complexity: Constant.

13.     const_iterator end() const;

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

    Throws: Nothing.

    Complexity: Constant.

14.     const_iterator cend() const;

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

    Throws: Nothing.

    Complexity: Constant.

15.     reverse_iterator rbegin();

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

    Throws: Nothing.

    Complexity: Constant.

16.     const_reverse_iterator rbegin() const;

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

    Throws: Nothing.

    Complexity: Constant.

17.     const_reverse_iterator crbegin() const;

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

    Throws: Nothing.

    Complexity: Constant.

18.     reverse_iterator rend();

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

    Throws: Nothing.

    Complexity: Constant.

19.     const_reverse_iterator rend() const;

    Effects: Returns a const_reverse_iterator pointing to the end 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.     size_type capacity() const;

    Effects: Number of elements for which memory has been allocated. capacity() is always greater than or equal to size().

    Throws: Nothing.

    Complexity: Constant.

25.     void reserve(size_type cnt);

    Effects: If n is less than or equal to capacity(), this call has no effect. Otherwise, it is a request for allocation of additional memory. If the request is successful, then capacity() is greater than or equal to n; otherwise, capacity() is unchanged. In either case, size() is unchanged.

    Throws: If memory allocation allocation throws or Key's copy constructor throws.

    Note: If capacity() is less than "cnt", iterators and references to to values might be invalidated.

26.     void shrink_to_fit();

    Effects: Tries to deallocate the excess of memory created

    Throws: If memory allocation throws, or Key's copy constructor throws.

    Complexity: Linear to size().

27.     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 search time plus linear insertion to the elements with bigger keys than x.

    Note: If an element is inserted it might invalidate elements.

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

    Effects: Inserts an object of type Key constructed with std::forward<Args>(args)... 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 search time (constant if x is inserted right before p) plus insertion linear to the elements with bigger keys than x.

    Note: If an element is inserted it might invalidate elements.

29.     iterator insert(const value_type & x);

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

    Complexity: Logarithmic search time plus linear insertion to the elements with bigger keys than x.

    Note: If an element is inserted it might invalidate elements.

30.     iterator insert(value_type && x);

    Effects: Inserts a new value_type move constructed from x and returns the iterator pointing to the newly inserted element.

    Complexity: Logarithmic search time plus linear insertion to the elements with bigger keys than x.

    Note: If an element is inserted it might invalidate elements.

31.      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 search time (constant if x is inserted right before p) plus insertion linear to the elements with bigger keys than x.

    Note: If an element is inserted it might invalidate elements.

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

    Effects: Inserts a new 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 search time (constant if x is inserted right before p) plus insertion linear to the elements with bigger keys than x.

    Note: If an element is inserted it might invalidate elements.

33.      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) search time plus N*size() insertion time.

    Note: If an element is inserted it might invalidate elements.

34.     const_iterator equal_range(const key_type & x) const;

35.     std::pair< iterator, iterator > equal_range(const key_type & x);

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

    Complexity: Logarithmic