--- /dev/null
+// Multimap implementation -*- C++ -*-
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+// 2011, 2012 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation. Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996,1997
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation. Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ */
+
+/** @file bits/stl_multimap.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{map}
+ */
+
+#ifndef _STL_MULTIMAP_H
+#define _STL_MULTIMAP_H 1
+
+#include <bits/concept_check.h>
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#include <initializer_list>
+#endif
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
+
+ /**
+ * @brief A standard container made up of (key,value) pairs, which can be
+ * retrieved based on a key, in logarithmic time.
+ *
+ * @ingroup associative_containers
+ *
+ * Meets the requirements of a <a href="tables.html#65">container</a>, a
+ * <a href="tables.html#66">reversible container</a>, and an
+ * <a href="tables.html#69">associative container</a> (using equivalent
+ * keys). For a @c multimap<Key,T> the key_type is Key, the mapped_type
+ * is T, and the value_type is std::pair<const Key,T>.
+ *
+ * Multimaps support bidirectional iterators.
+ *
+ * The private tree data is declared exactly the same way for map and
+ * multimap; the distinction is made entirely in how the tree functions are
+ * called (*_unique versus *_equal, same as the standard).
+ */
+ template <typename _Key, typename _Tp,
+ typename _Compare = std::less<_Key>,
+ typename _Alloc = std::allocator<std::pair<const _Key, _Tp> > >
+ class multimap
+ {
+ public:
+ typedef _Key key_type;
+ typedef _Tp mapped_type;
+ typedef std::pair<const _Key, _Tp> value_type;
+ typedef _Compare key_compare;
+ typedef _Alloc allocator_type;
+
+ private:
+ // concept requirements
+ typedef typename _Alloc::value_type _Alloc_value_type;
+ __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
+ __glibcxx_class_requires4(_Compare, bool, _Key, _Key,
+ _BinaryFunctionConcept)
+ __glibcxx_class_requires2(value_type, _Alloc_value_type, _SameTypeConcept)
+
+ public:
+ class value_compare
+ : public std::binary_function<value_type, value_type, bool>
+ {
+ friend class multimap<_Key, _Tp, _Compare, _Alloc>;
+ protected:
+ _Compare comp;
+
+ value_compare(_Compare __c)
+ : comp(__c) { }
+
+ public:
+ bool operator()(const value_type& __x, const value_type& __y) const
+ { return comp(__x.first, __y.first); }
+ };
+
+ private:
+ /// This turns a red-black tree into a [multi]map.
+ typedef typename _Alloc::template rebind<value_type>::other
+ _Pair_alloc_type;
+
+ typedef _Rb_tree<key_type, value_type, _Select1st<value_type>,
+ key_compare, _Pair_alloc_type> _Rep_type;
+ /// The actual tree structure.
+ _Rep_type _M_t;
+
+ public:
+ // many of these are specified differently in ISO, but the following are
+ // "functionally equivalent"
+ typedef typename _Pair_alloc_type::pointer pointer;
+ typedef typename _Pair_alloc_type::const_pointer const_pointer;
+ typedef typename _Pair_alloc_type::reference reference;
+ typedef typename _Pair_alloc_type::const_reference const_reference;
+ typedef typename _Rep_type::iterator iterator;
+ typedef typename _Rep_type::const_iterator const_iterator;
+ typedef typename _Rep_type::size_type size_type;
+ typedef typename _Rep_type::difference_type difference_type;
+ typedef typename _Rep_type::reverse_iterator reverse_iterator;
+ typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
+
+ // [23.3.2] construct/copy/destroy
+ // (get_allocator() is also listed in this section)
+ /**
+ * @brief Default constructor creates no elements.
+ */
+ multimap()
+ : _M_t() { }
+
+ /**
+ * @brief Creates a %multimap with no elements.
+ * @param __comp A comparison object.
+ * @param __a An allocator object.
+ */
+ explicit
+ multimap(const _Compare& __comp,
+ const allocator_type& __a = allocator_type())
+ : _M_t(__comp, _Pair_alloc_type(__a)) { }
+
+ /**
+ * @brief %Multimap copy constructor.
+ * @param __x A %multimap of identical element and allocator types.
+ *
+ * The newly-created %multimap uses a copy of the allocation object
+ * used by @a __x.
+ */
+ multimap(const multimap& __x)
+ : _M_t(__x._M_t) { }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief %Multimap move constructor.
+ * @param __x A %multimap of identical element and allocator types.
+ *
+ * The newly-created %multimap contains the exact contents of @a __x.
+ * The contents of @a __x are a valid, but unspecified %multimap.
+ */
+ multimap(multimap&& __x)
+ noexcept(is_nothrow_copy_constructible<_Compare>::value)
+ : _M_t(std::move(__x._M_t)) { }
+
+ /**
+ * @brief Builds a %multimap from an initializer_list.
+ * @param __l An initializer_list.
+ * @param __comp A comparison functor.
+ * @param __a An allocator object.
+ *
+ * Create a %multimap consisting of copies of the elements from
+ * the initializer_list. This is linear in N if the list is already
+ * sorted, and NlogN otherwise (where N is @a __l.size()).
+ */
+ multimap(initializer_list<value_type> __l,
+ const _Compare& __comp = _Compare(),
+ const allocator_type& __a = allocator_type())
+ : _M_t(__comp, _Pair_alloc_type(__a))
+ { _M_t._M_insert_equal(__l.begin(), __l.end()); }
+#endif
+
+ /**
+ * @brief Builds a %multimap from a range.
+ * @param __first An input iterator.
+ * @param __last An input iterator.
+ *
+ * Create a %multimap consisting of copies of the elements from
+ * [__first,__last). This is linear in N if the range is already sorted,
+ * and NlogN otherwise (where N is distance(__first,__last)).
+ */
+ template<typename _InputIterator>
+ multimap(_InputIterator __first, _InputIterator __last)
+ : _M_t()
+ { _M_t._M_insert_equal(__first, __last); }
+
+ /**
+ * @brief Builds a %multimap from a range.
+ * @param __first An input iterator.
+ * @param __last An input iterator.
+ * @param __comp A comparison functor.
+ * @param __a An allocator object.
+ *
+ * Create a %multimap consisting of copies of the elements from
+ * [__first,__last). This is linear in N if the range is already sorted,
+ * and NlogN otherwise (where N is distance(__first,__last)).
+ */
+ template<typename _InputIterator>
+ multimap(_InputIterator __first, _InputIterator __last,
+ const _Compare& __comp,
+ const allocator_type& __a = allocator_type())
+ : _M_t(__comp, _Pair_alloc_type(__a))
+ { _M_t._M_insert_equal(__first, __last); }
+
+ // FIXME There is no dtor declared, but we should have something generated
+ // by Doxygen. I don't know what tags to add to this paragraph to make
+ // that happen:
+ /**
+ * The dtor only erases the elements, and note that if the elements
+ * themselves are pointers, the pointed-to memory is not touched in any
+ * way. Managing the pointer is the user's responsibility.
+ */
+
+ /**
+ * @brief %Multimap assignment operator.
+ * @param __x A %multimap of identical element and allocator types.
+ *
+ * All the elements of @a __x are copied, but unlike the copy
+ * constructor, the allocator object is not copied.
+ */
+ multimap&
+ operator=(const multimap& __x)
+ {
+ _M_t = __x._M_t;
+ return *this;
+ }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief %Multimap move assignment operator.
+ * @param __x A %multimap of identical element and allocator types.
+ *
+ * The contents of @a __x are moved into this multimap (without copying).
+ * @a __x is a valid, but unspecified multimap.
+ */
+ multimap&
+ operator=(multimap&& __x)
+ {
+ // NB: DR 1204.
+ // NB: DR 675.
+ this->clear();
+ this->swap(__x);
+ return *this;
+ }
+
+ /**
+ * @brief %Multimap list assignment operator.
+ * @param __l An initializer_list.
+ *
+ * This function fills a %multimap with copies of the elements
+ * in the initializer list @a __l.
+ *
+ * Note that the assignment completely changes the %multimap and
+ * that the resulting %multimap's size is the same as the number
+ * of elements assigned. Old data may be lost.
+ */
+ multimap&
+ operator=(initializer_list<value_type> __l)
+ {
+ this->clear();
+ this->insert(__l.begin(), __l.end());
+ return *this;
+ }
+#endif
+
+ /// Get a copy of the memory allocation object.
+ allocator_type
+ get_allocator() const _GLIBCXX_NOEXCEPT
+ { return allocator_type(_M_t.get_allocator()); }
+
+ // iterators
+ /**
+ * Returns a read/write iterator that points to the first pair in the
+ * %multimap. Iteration is done in ascending order according to the
+ * keys.
+ */
+ iterator
+ begin() _GLIBCXX_NOEXCEPT
+ { return _M_t.begin(); }
+
+ /**
+ * Returns a read-only (constant) iterator that points to the first pair
+ * in the %multimap. Iteration is done in ascending order according to
+ * the keys.
+ */
+ const_iterator
+ begin() const _GLIBCXX_NOEXCEPT
+ { return _M_t.begin(); }
+
+ /**
+ * Returns a read/write iterator that points one past the last pair in
+ * the %multimap. Iteration is done in ascending order according to the
+ * keys.
+ */
+ iterator
+ end() _GLIBCXX_NOEXCEPT
+ { return _M_t.end(); }
+
+ /**
+ * Returns a read-only (constant) iterator that points one past the last
+ * pair in the %multimap. Iteration is done in ascending order according
+ * to the keys.
+ */
+ const_iterator
+ end() const _GLIBCXX_NOEXCEPT
+ { return _M_t.end(); }
+
+ /**
+ * Returns a read/write reverse iterator that points to the last pair in
+ * the %multimap. Iteration is done in descending order according to the
+ * keys.
+ */
+ reverse_iterator
+ rbegin() _GLIBCXX_NOEXCEPT
+ { return _M_t.rbegin(); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points to the
+ * last pair in the %multimap. Iteration is done in descending order
+ * according to the keys.
+ */
+ const_reverse_iterator
+ rbegin() const _GLIBCXX_NOEXCEPT
+ { return _M_t.rbegin(); }
+
+ /**
+ * Returns a read/write reverse iterator that points to one before the
+ * first pair in the %multimap. Iteration is done in descending order
+ * according to the keys.
+ */
+ reverse_iterator
+ rend() _GLIBCXX_NOEXCEPT
+ { return _M_t.rend(); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points to one
+ * before the first pair in the %multimap. Iteration is done in
+ * descending order according to the keys.
+ */
+ const_reverse_iterator
+ rend() const _GLIBCXX_NOEXCEPT
+ { return _M_t.rend(); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * Returns a read-only (constant) iterator that points to the first pair
+ * in the %multimap. Iteration is done in ascending order according to
+ * the keys.
+ */
+ const_iterator
+ cbegin() const noexcept
+ { return _M_t.begin(); }
+
+ /**
+ * Returns a read-only (constant) iterator that points one past the last
+ * pair in the %multimap. Iteration is done in ascending order according
+ * to the keys.
+ */
+ const_iterator
+ cend() const noexcept
+ { return _M_t.end(); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points to the
+ * last pair in the %multimap. Iteration is done in descending order
+ * according to the keys.
+ */
+ const_reverse_iterator
+ crbegin() const noexcept
+ { return _M_t.rbegin(); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points to one
+ * before the first pair in the %multimap. Iteration is done in
+ * descending order according to the keys.
+ */
+ const_reverse_iterator
+ crend() const noexcept
+ { return _M_t.rend(); }
+#endif
+
+ // capacity
+ /** Returns true if the %multimap is empty. */
+ bool
+ empty() const _GLIBCXX_NOEXCEPT
+ { return _M_t.empty(); }
+
+ /** Returns the size of the %multimap. */
+ size_type
+ size() const _GLIBCXX_NOEXCEPT
+ { return _M_t.size(); }
+
+ /** Returns the maximum size of the %multimap. */
+ size_type
+ max_size() const _GLIBCXX_NOEXCEPT
+ { return _M_t.max_size(); }
+
+ // modifiers
+ /**
+ * @brief Inserts a std::pair into the %multimap.
+ * @param __x Pair to be inserted (see std::make_pair for easy creation
+ * of pairs).
+ * @return An iterator that points to the inserted (key,value) pair.
+ *
+ * This function inserts a (key, value) pair into the %multimap.
+ * Contrary to a std::map the %multimap does not rely on unique keys and
+ * thus multiple pairs with the same key can be inserted.
+ *
+ * Insertion requires logarithmic time.
+ */
+ iterator
+ insert(const value_type& __x)
+ { return _M_t._M_insert_equal(__x); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename _Pair, typename = typename
+ std::enable_if<std::is_constructible<value_type,
+ _Pair&&>::value>::type>
+ iterator
+ insert(_Pair&& __x)
+ { return _M_t._M_insert_equal(std::forward<_Pair>(__x)); }
+#endif
+
+ /**
+ * @brief Inserts a std::pair into the %multimap.
+ * @param __position An iterator that serves as a hint as to where the
+ * pair should be inserted.
+ * @param __x Pair to be inserted (see std::make_pair for easy creation
+ * of pairs).
+ * @return An iterator that points to the inserted (key,value) pair.
+ *
+ * This function inserts a (key, value) pair into the %multimap.
+ * Contrary to a std::map the %multimap does not rely on unique keys and
+ * thus multiple pairs with the same key can be inserted.
+ * Note that the first parameter is only a hint and can potentially
+ * improve the performance of the insertion process. A bad hint would
+ * cause no gains in efficiency.
+ *
+ * For more on @a hinting, see:
+ * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt07ch17.html
+ *
+ * Insertion requires logarithmic time (if the hint is not taken).
+ */
+ iterator
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ insert(const_iterator __position, const value_type& __x)
+#else
+ insert(iterator __position, const value_type& __x)
+#endif
+ { return _M_t._M_insert_equal_(__position, __x); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename _Pair, typename = typename
+ std::enable_if<std::is_constructible<value_type,
+ _Pair&&>::value>::type>
+ iterator
+ insert(const_iterator __position, _Pair&& __x)
+ { return _M_t._M_insert_equal_(__position,
+ std::forward<_Pair>(__x)); }
+#endif
+
+ /**
+ * @brief A template function that attempts to insert a range
+ * of elements.
+ * @param __first Iterator pointing to the start of the range to be
+ * inserted.
+ * @param __last Iterator pointing to the end of the range.
+ *
+ * Complexity similar to that of the range constructor.
+ */
+ template<typename _InputIterator>
+ void
+ insert(_InputIterator __first, _InputIterator __last)
+ { _M_t._M_insert_equal(__first, __last); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Attempts to insert a list of std::pairs into the %multimap.
+ * @param __l A std::initializer_list<value_type> of pairs to be
+ * inserted.
+ *
+ * Complexity similar to that of the range constructor.
+ */
+ void
+ insert(initializer_list<value_type> __l)
+ { this->insert(__l.begin(), __l.end()); }
+#endif
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 130. Associative erase should return an iterator.
+ /**
+ * @brief Erases an element from a %multimap.
+ * @param __position An iterator pointing to the element to be erased.
+ * @return An iterator pointing to the element immediately following
+ * @a position prior to the element being erased. If no such
+ * element exists, end() is returned.
+ *
+ * This function erases an element, pointed to by the given iterator,
+ * from a %multimap. Note that this function only erases the element,
+ * and that if the element is itself a pointer, the pointed-to memory is
+ * not touched in any way. Managing the pointer is the user's
+ * responsibility.
+ */
+ iterator
+ erase(const_iterator __position)
+ { return _M_t.erase(__position); }
+
+ // LWG 2059.
+ iterator
+ erase(iterator __position)
+ { return _M_t.erase(__position); }
+#else
+ /**
+ * @brief Erases an element from a %multimap.
+ * @param __position An iterator pointing to the element to be erased.
+ *
+ * This function erases an element, pointed to by the given iterator,
+ * from a %multimap. Note that this function only erases the element,
+ * and that if the element is itself a pointer, the pointed-to memory is
+ * not touched in any way. Managing the pointer is the user's
+ * responsibility.
+ */
+ void
+ erase(iterator __position)
+ { _M_t.erase(__position); }
+#endif
+
+ /**
+ * @brief Erases elements according to the provided key.
+ * @param __x Key of element to be erased.
+ * @return The number of elements erased.
+ *
+ * This function erases all elements located by the given key from a
+ * %multimap.
+ * Note that this function only erases the element, and that if
+ * the element is itself a pointer, the pointed-to memory is not touched
+ * in any way. Managing the pointer is the user's responsibility.
+ */
+ size_type
+ erase(const key_type& __x)
+ { return _M_t.erase(__x); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 130. Associative erase should return an iterator.
+ /**
+ * @brief Erases a [first,last) range of elements from a %multimap.
+ * @param __first Iterator pointing to the start of the range to be
+ * erased.
+ * @param __last Iterator pointing to the end of the range to be
+ * erased .
+ * @return The iterator @a __last.
+ *
+ * This function erases a sequence of elements from a %multimap.
+ * Note that this function only erases the elements, and that if
+ * the elements themselves are pointers, the pointed-to memory is not
+ * touched in any way. Managing the pointer is the user's
+ * responsibility.
+ */
+ iterator
+ erase(const_iterator __first, const_iterator __last)
+ { return _M_t.erase(__first, __last); }
+#else
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 130. Associative erase should return an iterator.
+ /**
+ * @brief Erases a [first,last) range of elements from a %multimap.
+ * @param __first Iterator pointing to the start of the range to be
+ * erased.
+ * @param __last Iterator pointing to the end of the range to
+ * be erased.
+ *
+ * This function erases a sequence of elements from a %multimap.
+ * Note that this function only erases the elements, and that if
+ * the elements themselves are pointers, the pointed-to memory is not
+ * touched in any way. Managing the pointer is the user's
+ * responsibility.
+ */
+ void
+ erase(iterator __first, iterator __last)
+ { _M_t.erase(__first, __last); }
+#endif
+
+ /**
+ * @brief Swaps data with another %multimap.
+ * @param __x A %multimap of the same element and allocator types.
+ *
+ * This exchanges the elements between two multimaps in constant time.
+ * (It is only swapping a pointer, an integer, and an instance of
+ * the @c Compare type (which itself is often stateless and empty), so it
+ * should be quite fast.)
+ * Note that the global std::swap() function is specialized such that
+ * std::swap(m1,m2) will feed to this function.
+ */
+ void
+ swap(multimap& __x)
+ { _M_t.swap(__x._M_t); }
+
+ /**
+ * Erases all elements in a %multimap. Note that this function only
+ * erases the elements, and that if the elements themselves are pointers,
+ * the pointed-to memory is not touched in any way. Managing the pointer
+ * is the user's responsibility.
+ */
+ void
+ clear() _GLIBCXX_NOEXCEPT
+ { _M_t.clear(); }
+
+ // observers
+ /**
+ * Returns the key comparison object out of which the %multimap
+ * was constructed.
+ */
+ key_compare
+ key_comp() const
+ { return _M_t.key_comp(); }
+
+ /**
+ * Returns a value comparison object, built from the key comparison
+ * object out of which the %multimap was constructed.
+ */
+ value_compare
+ value_comp() const
+ { return value_compare(_M_t.key_comp()); }
+
+ // multimap operations
+ /**
+ * @brief Tries to locate an element in a %multimap.
+ * @param __x Key of (key, value) pair to be located.
+ * @return Iterator pointing to sought-after element,
+ * or end() if not found.
+ *
+ * This function takes a key and tries to locate the element with which
+ * the key matches. If successful the function returns an iterator
+ * pointing to the sought after %pair. If unsuccessful it returns the
+ * past-the-end ( @c end() ) iterator.
+ */
+ iterator
+ find(const key_type& __x)
+ { return _M_t.find(__x); }
+
+ /**
+ * @brief Tries to locate an element in a %multimap.
+ * @param __x Key of (key, value) pair to be located.
+ * @return Read-only (constant) iterator pointing to sought-after
+ * element, or end() if not found.
+ *
+ * This function takes a key and tries to locate the element with which
+ * the key matches. If successful the function returns a constant
+ * iterator pointing to the sought after %pair. If unsuccessful it
+ * returns the past-the-end ( @c end() ) iterator.
+ */
+ const_iterator
+ find(const key_type& __x) const
+ { return _M_t.find(__x); }
+
+ /**
+ * @brief Finds the number of elements with given key.
+ * @param __x Key of (key, value) pairs to be located.
+ * @return Number of elements with specified key.
+ */
+ size_type
+ count(const key_type& __x) const
+ { return _M_t.count(__x); }
+
+ /**
+ * @brief Finds the beginning of a subsequence matching given key.
+ * @param __x Key of (key, value) pair to be located.
+ * @return Iterator pointing to first element equal to or greater
+ * than key, or end().
+ *
+ * This function returns the first element of a subsequence of elements
+ * that matches the given key. If unsuccessful it returns an iterator
+ * pointing to the first element that has a greater value than given key
+ * or end() if no such element exists.
+ */
+ iterator
+ lower_bound(const key_type& __x)
+ { return _M_t.lower_bound(__x); }
+
+ /**
+ * @brief Finds the beginning of a subsequence matching given key.
+ * @param __x Key of (key, value) pair to be located.
+ * @return Read-only (constant) iterator pointing to first element
+ * equal to or greater than key, or end().
+ *
+ * This function returns the first element of a subsequence of
+ * elements that matches the given key. If unsuccessful the
+ * iterator will point to the next greatest element or, if no
+ * such greater element exists, to end().
+ */
+ const_iterator
+ lower_bound(const key_type& __x) const
+ { return _M_t.lower_bound(__x); }
+
+ /**
+ * @brief Finds the end of a subsequence matching given key.
+ * @param __x Key of (key, value) pair to be located.
+ * @return Iterator pointing to the first element
+ * greater than key, or end().
+ */
+ iterator
+ upper_bound(const key_type& __x)
+ { return _M_t.upper_bound(__x); }
+
+ /**
+ * @brief Finds the end of a subsequence matching given key.
+ * @param __x Key of (key, value) pair to be located.
+ * @return Read-only (constant) iterator pointing to first iterator
+ * greater than key, or end().
+ */
+ const_iterator
+ upper_bound(const key_type& __x) const
+ { return _M_t.upper_bound(__x); }
+
+ /**
+ * @brief Finds a subsequence matching given key.
+ * @param __x Key of (key, value) pairs to be located.
+ * @return Pair of iterators that possibly points to the subsequence
+ * matching given key.
+ *
+ * This function is equivalent to
+ * @code
+ * std::make_pair(c.lower_bound(val),
+ * c.upper_bound(val))
+ * @endcode
+ * (but is faster than making the calls separately).
+ */
+ std::pair<iterator, iterator>
+ equal_range(const key_type& __x)
+ { return _M_t.equal_range(__x); }
+
+ /**
+ * @brief Finds a subsequence matching given key.
+ * @param __x Key of (key, value) pairs to be located.
+ * @return Pair of read-only (constant) iterators that possibly points
+ * to the subsequence matching given key.
+ *
+ * This function is equivalent to
+ * @code
+ * std::make_pair(c.lower_bound(val),
+ * c.upper_bound(val))
+ * @endcode
+ * (but is faster than making the calls separately).
+ */
+ std::pair<const_iterator, const_iterator>
+ equal_range(const key_type& __x) const
+ { return _M_t.equal_range(__x); }
+
+ template<typename _K1, typename _T1, typename _C1, typename _A1>
+ friend bool
+ operator==(const multimap<_K1, _T1, _C1, _A1>&,
+ const multimap<_K1, _T1, _C1, _A1>&);
+
+ template<typename _K1, typename _T1, typename _C1, typename _A1>
+ friend bool
+ operator<(const multimap<_K1, _T1, _C1, _A1>&,
+ const multimap<_K1, _T1, _C1, _A1>&);
+ };
+
+ /**
+ * @brief Multimap equality comparison.
+ * @param __x A %multimap.
+ * @param __y A %multimap of the same type as @a __x.
+ * @return True iff the size and elements of the maps are equal.
+ *
+ * This is an equivalence relation. It is linear in the size of the
+ * multimaps. Multimaps are considered equivalent if their sizes are equal,
+ * and if corresponding elements compare equal.
+ */
+ template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
+ inline bool
+ operator==(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
+ const multimap<_Key, _Tp, _Compare, _Alloc>& __y)
+ { return __x._M_t == __y._M_t; }
+
+ /**
+ * @brief Multimap ordering relation.
+ * @param __x A %multimap.
+ * @param __y A %multimap of the same type as @a __x.
+ * @return True iff @a x is lexicographically less than @a y.
+ *
+ * This is a total ordering relation. It is linear in the size of the
+ * multimaps. The elements must be comparable with @c <.
+ *
+ * See std::lexicographical_compare() for how the determination is made.
+ */
+ template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
+ inline bool
+ operator<(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
+ const multimap<_Key, _Tp, _Compare, _Alloc>& __y)
+ { return __x._M_t < __y._M_t; }
+
+ /// Based on operator==
+ template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
+ inline bool
+ operator!=(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
+ const multimap<_Key, _Tp, _Compare, _Alloc>& __y)
+ { return !(__x == __y); }
+
+ /// Based on operator<
+ template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
+ inline bool
+ operator>(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
+ const multimap<_Key, _Tp, _Compare, _Alloc>& __y)
+ { return __y < __x; }
+
+ /// Based on operator<
+ template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
+ inline bool
+ operator<=(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
+ const multimap<_Key, _Tp, _Compare, _Alloc>& __y)
+ { return !(__y < __x); }
+
+ /// Based on operator<
+ template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
+ inline bool
+ operator>=(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
+ const multimap<_Key, _Tp, _Compare, _Alloc>& __y)
+ { return !(__x < __y); }
+
+ /// See std::multimap::swap().
+ template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
+ inline void
+ swap(multimap<_Key, _Tp, _Compare, _Alloc>& __x,
+ multimap<_Key, _Tp, _Compare, _Alloc>& __y)
+ { __x.swap(__y); }
+
+_GLIBCXX_END_NAMESPACE_CONTAINER
+} // namespace std
+
+#endif /* _STL_MULTIMAP_H */
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