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authorpeter <peter@FreeBSD.org>2008-06-01 00:03:21 +0000
committerpeter <peter@FreeBSD.org>2008-06-01 00:03:21 +0000
commita2be5f0c15218b0177d73b17d9bcb7589965d685 (patch)
treec9f0cd9c22378356a1716d32e13e70bc90f98b9c /libstdc++/include/bits/stl_algo.h
parent9e0f3cc19c9df1594c9cc36cfd8fddc83c52ad12 (diff)
downloadFreeBSD-src-a2be5f0c15218b0177d73b17d9bcb7589965d685.zip
FreeBSD-src-a2be5f0c15218b0177d73b17d9bcb7589965d685.tar.gz
Reorganize the gcc vendor import work area. This flattens out a bunch
of unnecessary path components that are relics of cvs2svn. (These are directory moves)
Diffstat (limited to 'libstdc++/include/bits/stl_algo.h')
-rw-r--r--libstdc++/include/bits/stl_algo.h5504
1 files changed, 5504 insertions, 0 deletions
diff --git a/libstdc++/include/bits/stl_algo.h b/libstdc++/include/bits/stl_algo.h
new file mode 100644
index 0000000..cf3cd71
--- /dev/null
+++ b/libstdc++/include/bits/stl_algo.h
@@ -0,0 +1,5504 @@
+// Algorithm implementation -*- C++ -*-
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
+// 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 2, 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING. If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction. Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License. This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+/*
+ *
+ * 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
+ * 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 stl_algo.h
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
+#ifndef _ALGO_H
+#define _ALGO_H 1
+
+#include <bits/stl_heap.h>
+#include <bits/stl_tempbuf.h> // for _Temporary_buffer
+#include <debug/debug.h>
+
+// See concept_check.h for the __glibcxx_*_requires macros.
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+ /**
+ * @brief Find the median of three values.
+ * @param a A value.
+ * @param b A value.
+ * @param c A value.
+ * @return One of @p a, @p b or @p c.
+ *
+ * If @c {l,m,n} is some convolution of @p {a,b,c} such that @c l<=m<=n
+ * then the value returned will be @c m.
+ * This is an SGI extension.
+ * @ingroup SGIextensions
+ */
+ template<typename _Tp>
+ inline const _Tp&
+ __median(const _Tp& __a, const _Tp& __b, const _Tp& __c)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
+ if (__a < __b)
+ if (__b < __c)
+ return __b;
+ else if (__a < __c)
+ return __c;
+ else
+ return __a;
+ else if (__a < __c)
+ return __a;
+ else if (__b < __c)
+ return __c;
+ else
+ return __b;
+ }
+
+ /**
+ * @brief Find the median of three values using a predicate for comparison.
+ * @param a A value.
+ * @param b A value.
+ * @param c A value.
+ * @param comp A binary predicate.
+ * @return One of @p a, @p b or @p c.
+ *
+ * If @c {l,m,n} is some convolution of @p {a,b,c} such that @p comp(l,m)
+ * and @p comp(m,n) are both true then the value returned will be @c m.
+ * This is an SGI extension.
+ * @ingroup SGIextensions
+ */
+ template<typename _Tp, typename _Compare>
+ inline const _Tp&
+ __median(const _Tp& __a, const _Tp& __b, const _Tp& __c, _Compare __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BinaryFunctionConcept<_Compare,bool,_Tp,_Tp>)
+ if (__comp(__a, __b))
+ if (__comp(__b, __c))
+ return __b;
+ else if (__comp(__a, __c))
+ return __c;
+ else
+ return __a;
+ else if (__comp(__a, __c))
+ return __a;
+ else if (__comp(__b, __c))
+ return __c;
+ else
+ return __b;
+ }
+
+ /**
+ * @brief Apply a function to every element of a sequence.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param f A unary function object.
+ * @return @p f.
+ *
+ * Applies the function object @p f to each element in the range
+ * @p [first,last). @p f must not modify the order of the sequence.
+ * If @p f has a return value it is ignored.
+ */
+ template<typename _InputIterator, typename _Function>
+ _Function
+ for_each(_InputIterator __first, _InputIterator __last, _Function __f)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_requires_valid_range(__first, __last);
+ for ( ; __first != __last; ++__first)
+ __f(*__first);
+ return __f;
+ }
+
+ /**
+ * @if maint
+ * This is an overload used by find() for the Input Iterator case.
+ * @endif
+ */
+ template<typename _InputIterator, typename _Tp>
+ inline _InputIterator
+ __find(_InputIterator __first, _InputIterator __last,
+ const _Tp& __val, input_iterator_tag)
+ {
+ while (__first != __last && !(*__first == __val))
+ ++__first;
+ return __first;
+ }
+
+ /**
+ * @if maint
+ * This is an overload used by find_if() for the Input Iterator case.
+ * @endif
+ */
+ template<typename _InputIterator, typename _Predicate>
+ inline _InputIterator
+ __find_if(_InputIterator __first, _InputIterator __last,
+ _Predicate __pred, input_iterator_tag)
+ {
+ while (__first != __last && !__pred(*__first))
+ ++__first;
+ return __first;
+ }
+
+ /**
+ * @if maint
+ * This is an overload used by find() for the RAI case.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Tp>
+ _RandomAccessIterator
+ __find(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ const _Tp& __val, random_access_iterator_tag)
+ {
+ typename iterator_traits<_RandomAccessIterator>::difference_type
+ __trip_count = (__last - __first) >> 2;
+
+ for ( ; __trip_count > 0 ; --__trip_count)
+ {
+ if (*__first == __val)
+ return __first;
+ ++__first;
+
+ if (*__first == __val)
+ return __first;
+ ++__first;
+
+ if (*__first == __val)
+ return __first;
+ ++__first;
+
+ if (*__first == __val)
+ return __first;
+ ++__first;
+ }
+
+ switch (__last - __first)
+ {
+ case 3:
+ if (*__first == __val)
+ return __first;
+ ++__first;
+ case 2:
+ if (*__first == __val)
+ return __first;
+ ++__first;
+ case 1:
+ if (*__first == __val)
+ return __first;
+ ++__first;
+ case 0:
+ default:
+ return __last;
+ }
+ }
+
+ /**
+ * @if maint
+ * This is an overload used by find_if() for the RAI case.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Predicate>
+ _RandomAccessIterator
+ __find_if(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _Predicate __pred, random_access_iterator_tag)
+ {
+ typename iterator_traits<_RandomAccessIterator>::difference_type
+ __trip_count = (__last - __first) >> 2;
+
+ for ( ; __trip_count > 0 ; --__trip_count)
+ {
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+ }
+
+ switch (__last - __first)
+ {
+ case 3:
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+ case 2:
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+ case 1:
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+ case 0:
+ default:
+ return __last;
+ }
+ }
+
+ /**
+ * @if maint
+ * This is an overload of find() for streambuf iterators.
+ * @endif
+ */
+ template<typename _CharT>
+ typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+ istreambuf_iterator<_CharT> >::__type
+ find(istreambuf_iterator<_CharT>, istreambuf_iterator<_CharT>,
+ const _CharT&);
+
+ /**
+ * @brief Find the first occurrence of a value in a sequence.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param val The value to find.
+ * @return The first iterator @c i in the range @p [first,last)
+ * such that @c *i == @p val, or @p last if no such iterator exists.
+ */
+ template<typename _InputIterator, typename _Tp>
+ inline _InputIterator
+ find(_InputIterator __first, _InputIterator __last,
+ const _Tp& __val)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+ return std::__find(__first, __last, __val,
+ std::__iterator_category(__first));
+ }
+
+ /**
+ * @brief Find the first element in a sequence for which a predicate is true.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param pred A predicate.
+ * @return The first iterator @c i in the range @p [first,last)
+ * such that @p pred(*i) is true, or @p last if no such iterator exists.
+ */
+ template<typename _InputIterator, typename _Predicate>
+ inline _InputIterator
+ find_if(_InputIterator __first, _InputIterator __last,
+ _Predicate __pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+ return std::__find_if(__first, __last, __pred,
+ std::__iterator_category(__first));
+ }
+
+ /**
+ * @brief Find two adjacent values in a sequence that are equal.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @return The first iterator @c i such that @c i and @c i+1 are both
+ * valid iterators in @p [first,last) and such that @c *i == @c *(i+1),
+ * or @p last if no such iterator exists.
+ */
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ adjacent_find(_ForwardIterator __first, _ForwardIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_EqualityComparableConcept<
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+ if (__first == __last)
+ return __last;
+ _ForwardIterator __next = __first;
+ while(++__next != __last)
+ {
+ if (*__first == *__next)
+ return __first;
+ __first = __next;
+ }
+ return __last;
+ }
+
+ /**
+ * @brief Find two adjacent values in a sequence using a predicate.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param binary_pred A binary predicate.
+ * @return The first iterator @c i such that @c i and @c i+1 are both
+ * valid iterators in @p [first,last) and such that
+ * @p binary_pred(*i,*(i+1)) is true, or @p last if no such iterator
+ * exists.
+ */
+ template<typename _ForwardIterator, typename _BinaryPredicate>
+ _ForwardIterator
+ adjacent_find(_ForwardIterator __first, _ForwardIterator __last,
+ _BinaryPredicate __binary_pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+ if (__first == __last)
+ return __last;
+ _ForwardIterator __next = __first;
+ while(++__next != __last)
+ {
+ if (__binary_pred(*__first, *__next))
+ return __first;
+ __first = __next;
+ }
+ return __last;
+ }
+
+ /**
+ * @brief Count the number of copies of a value in a sequence.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param value The value to be counted.
+ * @return The number of iterators @c i in the range @p [first,last)
+ * for which @c *i == @p value
+ */
+ template<typename _InputIterator, typename _Tp>
+ typename iterator_traits<_InputIterator>::difference_type
+ count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+ typename iterator_traits<_InputIterator>::difference_type __n = 0;
+ for ( ; __first != __last; ++__first)
+ if (*__first == __value)
+ ++__n;
+ return __n;
+ }
+
+ /**
+ * @brief Count the elements of a sequence for which a predicate is true.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param pred A predicate.
+ * @return The number of iterators @c i in the range @p [first,last)
+ * for which @p pred(*i) is true.
+ */
+ template<typename _InputIterator, typename _Predicate>
+ typename iterator_traits<_InputIterator>::difference_type
+ count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+ typename iterator_traits<_InputIterator>::difference_type __n = 0;
+ for ( ; __first != __last; ++__first)
+ if (__pred(*__first))
+ ++__n;
+ return __n;
+ }
+
+ /**
+ * @brief Search a sequence for a matching sub-sequence.
+ * @param first1 A forward iterator.
+ * @param last1 A forward iterator.
+ * @param first2 A forward iterator.
+ * @param last2 A forward iterator.
+ * @return The first iterator @c i in the range
+ * @p [first1,last1-(last2-first2)) such that @c *(i+N) == @p *(first2+N)
+ * for each @c N in the range @p [0,last2-first2), or @p last1 if no
+ * such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for a sub-sequence that compares
+ * equal value-by-value with the sequence given by @p [first2,last2) and
+ * returns an iterator to the first element of the sub-sequence, or
+ * @p last1 if the sub-sequence is not found.
+ *
+ * Because the sub-sequence must lie completely within the range
+ * @p [first1,last1) it must start at a position less than
+ * @p last1-(last2-first2) where @p last2-first2 is the length of the
+ * sub-sequence.
+ * This means that the returned iterator @c i will be in the range
+ * @p [first1,last1-(last2-first2))
+ */
+ template<typename _ForwardIterator1, typename _ForwardIterator2>
+ _ForwardIterator1
+ search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_ForwardIterator1>::value_type,
+ typename iterator_traits<_ForwardIterator2>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+ // Test for empty ranges
+ if (__first1 == __last1 || __first2 == __last2)
+ return __first1;
+
+ // Test for a pattern of length 1.
+ _ForwardIterator2 __tmp(__first2);
+ ++__tmp;
+ if (__tmp == __last2)
+ return std::find(__first1, __last1, *__first2);
+
+ // General case.
+ _ForwardIterator2 __p1, __p;
+ __p1 = __first2; ++__p1;
+ _ForwardIterator1 __current = __first1;
+
+ while (__first1 != __last1)
+ {
+ __first1 = std::find(__first1, __last1, *__first2);
+ if (__first1 == __last1)
+ return __last1;
+
+ __p = __p1;
+ __current = __first1;
+ if (++__current == __last1)
+ return __last1;
+
+ while (*__current == *__p)
+ {
+ if (++__p == __last2)
+ return __first1;
+ if (++__current == __last1)
+ return __last1;
+ }
+ ++__first1;
+ }
+ return __first1;
+ }
+
+ /**
+ * @brief Search a sequence for a matching sub-sequence using a predicate.
+ * @param first1 A forward iterator.
+ * @param last1 A forward iterator.
+ * @param first2 A forward iterator.
+ * @param last2 A forward iterator.
+ * @param predicate A binary predicate.
+ * @return The first iterator @c i in the range
+ * @p [first1,last1-(last2-first2)) such that
+ * @p predicate(*(i+N),*(first2+N)) is true for each @c N in the range
+ * @p [0,last2-first2), or @p last1 if no such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for a sub-sequence that compares
+ * equal value-by-value with the sequence given by @p [first2,last2),
+ * using @p predicate to determine equality, and returns an iterator
+ * to the first element of the sub-sequence, or @p last1 if no such
+ * iterator exists.
+ *
+ * @see search(_ForwardIter1, _ForwardIter1, _ForwardIter2, _ForwardIter2)
+ */
+ template<typename _ForwardIterator1, typename _ForwardIterator2,
+ typename _BinaryPredicate>
+ _ForwardIterator1
+ search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ _BinaryPredicate __predicate)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator1>::value_type,
+ typename iterator_traits<_ForwardIterator2>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+
+ // Test for empty ranges
+ if (__first1 == __last1 || __first2 == __last2)
+ return __first1;
+
+ // Test for a pattern of length 1.
+ _ForwardIterator2 __tmp(__first2);
+ ++__tmp;
+ if (__tmp == __last2)
+ {
+ while (__first1 != __last1 && !__predicate(*__first1, *__first2))
+ ++__first1;
+ return __first1;
+ }
+
+ // General case.
+ _ForwardIterator2 __p1, __p;
+ __p1 = __first2; ++__p1;
+ _ForwardIterator1 __current = __first1;
+
+ while (__first1 != __last1)
+ {
+ while (__first1 != __last1)
+ {
+ if (__predicate(*__first1, *__first2))
+ break;
+ ++__first1;
+ }
+ while (__first1 != __last1 && !__predicate(*__first1, *__first2))
+ ++__first1;
+ if (__first1 == __last1)
+ return __last1;
+
+ __p = __p1;
+ __current = __first1;
+ if (++__current == __last1)
+ return __last1;
+
+ while (__predicate(*__current, *__p))
+ {
+ if (++__p == __last2)
+ return __first1;
+ if (++__current == __last1)
+ return __last1;
+ }
+ ++__first1;
+ }
+ return __first1;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified
+ * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&)
+ * overloaded for forward iterators.
+ * @endif
+ */
+ template<typename _ForwardIterator, typename _Integer, typename _Tp>
+ _ForwardIterator
+ __search_n(_ForwardIterator __first, _ForwardIterator __last,
+ _Integer __count, const _Tp& __val,
+ std::forward_iterator_tag)
+ {
+ __first = std::find(__first, __last, __val);
+ while (__first != __last)
+ {
+ typename iterator_traits<_ForwardIterator>::difference_type
+ __n = __count;
+ _ForwardIterator __i = __first;
+ ++__i;
+ while (__i != __last && __n != 1 && *__i == __val)
+ {
+ ++__i;
+ --__n;
+ }
+ if (__n == 1)
+ return __first;
+ if (__i == __last)
+ return __last;
+ __first = std::find(++__i, __last, __val);
+ }
+ return __last;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified
+ * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&)
+ * overloaded for random access iterators.
+ * @endif
+ */
+ template<typename _RandomAccessIter, typename _Integer, typename _Tp>
+ _RandomAccessIter
+ __search_n(_RandomAccessIter __first, _RandomAccessIter __last,
+ _Integer __count, const _Tp& __val,
+ std::random_access_iterator_tag)
+ {
+
+ typedef typename std::iterator_traits<_RandomAccessIter>::difference_type
+ _DistanceType;
+
+ _DistanceType __tailSize = __last - __first;
+ const _DistanceType __pattSize = __count;
+
+ if (__tailSize < __pattSize)
+ return __last;
+
+ const _DistanceType __skipOffset = __pattSize - 1;
+ _RandomAccessIter __lookAhead = __first + __skipOffset;
+ __tailSize -= __pattSize;
+
+ while (1) // the main loop...
+ {
+ // __lookAhead here is always pointing to the last element of next
+ // possible match.
+ while (!(*__lookAhead == __val)) // the skip loop...
+ {
+ if (__tailSize < __pattSize)
+ return __last; // Failure
+ __lookAhead += __pattSize;
+ __tailSize -= __pattSize;
+ }
+ _DistanceType __remainder = __skipOffset;
+ for (_RandomAccessIter __backTrack = __lookAhead - 1;
+ *__backTrack == __val; --__backTrack)
+ {
+ if (--__remainder == 0)
+ return (__lookAhead - __skipOffset); // Success
+ }
+ if (__remainder > __tailSize)
+ return __last; // Failure
+ __lookAhead += __remainder;
+ __tailSize -= __remainder;
+ }
+ }
+
+ /**
+ * @brief Search a sequence for a number of consecutive values.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param count The number of consecutive values.
+ * @param val The value to find.
+ * @return The first iterator @c i in the range @p [first,last-count)
+ * such that @c *(i+N) == @p val for each @c N in the range @p [0,count),
+ * or @p last if no such iterator exists.
+ *
+ * Searches the range @p [first,last) for @p count consecutive elements
+ * equal to @p val.
+ */
+ template<typename _ForwardIterator, typename _Integer, typename _Tp>
+ _ForwardIterator
+ search_n(_ForwardIterator __first, _ForwardIterator __last,
+ _Integer __count, const _Tp& __val)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__count <= 0)
+ return __first;
+ if (__count == 1)
+ return std::find(__first, __last, __val);
+ return std::__search_n(__first, __last, __count, __val,
+ std::__iterator_category(__first));
+ }
+
+ /**
+ * @if maint
+ * This is an uglified
+ * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&,
+ * _BinaryPredicate)
+ * overloaded for forward iterators.
+ * @endif
+ */
+ template<typename _ForwardIterator, typename _Integer, typename _Tp,
+ typename _BinaryPredicate>
+ _ForwardIterator
+ __search_n(_ForwardIterator __first, _ForwardIterator __last,
+ _Integer __count, const _Tp& __val,
+ _BinaryPredicate __binary_pred, std::forward_iterator_tag)
+ {
+ while (__first != __last && !__binary_pred(*__first, __val))
+ ++__first;
+
+ while (__first != __last)
+ {
+ typename iterator_traits<_ForwardIterator>::difference_type
+ __n = __count;
+ _ForwardIterator __i = __first;
+ ++__i;
+ while (__i != __last && __n != 1 && __binary_pred(*__i, __val))
+ {
+ ++__i;
+ --__n;
+ }
+ if (__n == 1)
+ return __first;
+ if (__i == __last)
+ return __last;
+ __first = ++__i;
+ while (__first != __last && !__binary_pred(*__first, __val))
+ ++__first;
+ }
+ return __last;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified
+ * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&,
+ * _BinaryPredicate)
+ * overloaded for random access iterators.
+ * @endif
+ */
+ template<typename _RandomAccessIter, typename _Integer, typename _Tp,
+ typename _BinaryPredicate>
+ _RandomAccessIter
+ __search_n(_RandomAccessIter __first, _RandomAccessIter __last,
+ _Integer __count, const _Tp& __val,
+ _BinaryPredicate __binary_pred, std::random_access_iterator_tag)
+ {
+
+ typedef typename std::iterator_traits<_RandomAccessIter>::difference_type
+ _DistanceType;
+
+ _DistanceType __tailSize = __last - __first;
+ const _DistanceType __pattSize = __count;
+
+ if (__tailSize < __pattSize)
+ return __last;
+
+ const _DistanceType __skipOffset = __pattSize - 1;
+ _RandomAccessIter __lookAhead = __first + __skipOffset;
+ __tailSize -= __pattSize;
+
+ while (1) // the main loop...
+ {
+ // __lookAhead here is always pointing to the last element of next
+ // possible match.
+ while (!__binary_pred(*__lookAhead, __val)) // the skip loop...
+ {
+ if (__tailSize < __pattSize)
+ return __last; // Failure
+ __lookAhead += __pattSize;
+ __tailSize -= __pattSize;
+ }
+ _DistanceType __remainder = __skipOffset;
+ for (_RandomAccessIter __backTrack = __lookAhead - 1;
+ __binary_pred(*__backTrack, __val); --__backTrack)
+ {
+ if (--__remainder == 0)
+ return (__lookAhead - __skipOffset); // Success
+ }
+ if (__remainder > __tailSize)
+ return __last; // Failure
+ __lookAhead += __remainder;
+ __tailSize -= __remainder;
+ }
+ }
+
+ /**
+ * @brief Search a sequence for a number of consecutive values using a
+ * predicate.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param count The number of consecutive values.
+ * @param val The value to find.
+ * @param binary_pred A binary predicate.
+ * @return The first iterator @c i in the range @p [first,last-count)
+ * such that @p binary_pred(*(i+N),val) is true for each @c N in the
+ * range @p [0,count), or @p last if no such iterator exists.
+ *
+ * Searches the range @p [first,last) for @p count consecutive elements
+ * for which the predicate returns true.
+ */
+ template<typename _ForwardIterator, typename _Integer, typename _Tp,
+ typename _BinaryPredicate>
+ _ForwardIterator
+ search_n(_ForwardIterator __first, _ForwardIterator __last,
+ _Integer __count, const _Tp& __val,
+ _BinaryPredicate __binary_pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__count <= 0)
+ return __first;
+ if (__count == 1)
+ {
+ while (__first != __last && !__binary_pred(*__first, __val))
+ ++__first;
+ return __first;
+ }
+ return std::__search_n(__first, __last, __count, __val, __binary_pred,
+ std::__iterator_category(__first));
+ }
+
+ /**
+ * @brief Swap the elements of two sequences.
+ * @param first1 A forward iterator.
+ * @param last1 A forward iterator.
+ * @param first2 A forward iterator.
+ * @return An iterator equal to @p first2+(last1-first1).
+ *
+ * Swaps each element in the range @p [first1,last1) with the
+ * corresponding element in the range @p [first2,(last1-first1)).
+ * The ranges must not overlap.
+ */
+ template<typename _ForwardIterator1, typename _ForwardIterator2>
+ _ForwardIterator2
+ swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator1>)
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator2>)
+ __glibcxx_function_requires(_ConvertibleConcept<
+ typename iterator_traits<_ForwardIterator1>::value_type,
+ typename iterator_traits<_ForwardIterator2>::value_type>)
+ __glibcxx_function_requires(_ConvertibleConcept<
+ typename iterator_traits<_ForwardIterator2>::value_type,
+ typename iterator_traits<_ForwardIterator1>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+
+ for ( ; __first1 != __last1; ++__first1, ++__first2)
+ std::iter_swap(__first1, __first2);
+ return __first2;
+ }
+
+ /**
+ * @brief Perform an operation on a sequence.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param unary_op A unary operator.
+ * @return An output iterator equal to @p result+(last-first).
+ *
+ * Applies the operator to each element in the input range and assigns
+ * the results to successive elements of the output sequence.
+ * Evaluates @p *(result+N)=unary_op(*(first+N)) for each @c N in the
+ * range @p [0,last-first).
+ *
+ * @p unary_op must not alter its argument.
+ */
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _UnaryOperation>
+ _OutputIterator
+ transform(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _UnaryOperation __unary_op)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ // "the type returned by a _UnaryOperation"
+ __typeof__(__unary_op(*__first))>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for ( ; __first != __last; ++__first, ++__result)
+ *__result = __unary_op(*__first);
+ return __result;
+ }
+
+ /**
+ * @brief Perform an operation on corresponding elements of two sequences.
+ * @param first1 An input iterator.
+ * @param last1 An input iterator.
+ * @param first2 An input iterator.
+ * @param result An output iterator.
+ * @param binary_op A binary operator.
+ * @return An output iterator equal to @p result+(last-first).
+ *
+ * Applies the operator to the corresponding elements in the two
+ * input ranges and assigns the results to successive elements of the
+ * output sequence.
+ * Evaluates @p *(result+N)=binary_op(*(first1+N),*(first2+N)) for each
+ * @c N in the range @p [0,last1-first1).
+ *
+ * @p binary_op must not alter either of its arguments.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _BinaryOperation>
+ _OutputIterator
+ transform(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _OutputIterator __result,
+ _BinaryOperation __binary_op)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ // "the type returned by a _BinaryOperation"
+ __typeof__(__binary_op(*__first1,*__first2))>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+
+ for ( ; __first1 != __last1; ++__first1, ++__first2, ++__result)
+ *__result = __binary_op(*__first1, *__first2);
+ return __result;
+ }
+
+ /**
+ * @brief Replace each occurrence of one value in a sequence with another
+ * value.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param old_value The value to be replaced.
+ * @param new_value The replacement value.
+ * @return replace() returns no value.
+ *
+ * For each iterator @c i in the range @p [first,last) if @c *i ==
+ * @p old_value then the assignment @c *i = @p new_value is performed.
+ */
+ template<typename _ForwardIterator, typename _Tp>
+ void
+ replace(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __old_value, const _Tp& __new_value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_function_requires(_ConvertibleConcept<_Tp,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for ( ; __first != __last; ++__first)
+ if (*__first == __old_value)
+ *__first = __new_value;
+ }
+
+ /**
+ * @brief Replace each value in a sequence for which a predicate returns
+ * true with another value.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param pred A predicate.
+ * @param new_value The replacement value.
+ * @return replace_if() returns no value.
+ *
+ * For each iterator @c i in the range @p [first,last) if @p pred(*i)
+ * is true then the assignment @c *i = @p new_value is performed.
+ */
+ template<typename _ForwardIterator, typename _Predicate, typename _Tp>
+ void
+ replace_if(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred, const _Tp& __new_value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_ConvertibleConcept<_Tp,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for ( ; __first != __last; ++__first)
+ if (__pred(*__first))
+ *__first = __new_value;
+ }
+
+ /**
+ * @brief Copy a sequence, replacing each element of one value with another
+ * value.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param old_value The value to be replaced.
+ * @param new_value The replacement value.
+ * @return The end of the output sequence, @p result+(last-first).
+ *
+ * Copies each element in the input range @p [first,last) to the
+ * output range @p [result,result+(last-first)) replacing elements
+ * equal to @p old_value with @p new_value.
+ */
+ template<typename _InputIterator, typename _OutputIterator, typename _Tp>
+ _OutputIterator
+ replace_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result,
+ const _Tp& __old_value, const _Tp& __new_value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for ( ; __first != __last; ++__first, ++__result)
+ if (*__first == __old_value)
+ *__result = __new_value;
+ else
+ *__result = *__first;
+ return __result;
+ }
+
+ /**
+ * @brief Copy a sequence, replacing each value for which a predicate
+ * returns true with another value.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param pred A predicate.
+ * @param new_value The replacement value.
+ * @return The end of the output sequence, @p result+(last-first).
+ *
+ * Copies each element in the range @p [first,last) to the range
+ * @p [result,result+(last-first)) replacing elements for which
+ * @p pred returns true with @p new_value.
+ */
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _Predicate, typename _Tp>
+ _OutputIterator
+ replace_copy_if(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result,
+ _Predicate __pred, const _Tp& __new_value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for ( ; __first != __last; ++__first, ++__result)
+ if (__pred(*__first))
+ *__result = __new_value;
+ else
+ *__result = *__first;
+ return __result;
+ }
+
+ /**
+ * @brief Assign the result of a function object to each value in a
+ * sequence.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param gen A function object taking no arguments.
+ * @return generate() returns no value.
+ *
+ * Performs the assignment @c *i = @p gen() for each @c i in the range
+ * @p [first,last).
+ */
+ template<typename _ForwardIterator, typename _Generator>
+ void
+ generate(_ForwardIterator __first, _ForwardIterator __last,
+ _Generator __gen)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_GeneratorConcept<_Generator,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for ( ; __first != __last; ++__first)
+ *__first = __gen();
+ }
+
+ /**
+ * @brief Assign the result of a function object to each value in a
+ * sequence.
+ * @param first A forward iterator.
+ * @param n The length of the sequence.
+ * @param gen A function object taking no arguments.
+ * @return The end of the sequence, @p first+n
+ *
+ * Performs the assignment @c *i = @p gen() for each @c i in the range
+ * @p [first,first+n).
+ */
+ template<typename _OutputIterator, typename _Size, typename _Generator>
+ _OutputIterator
+ generate_n(_OutputIterator __first, _Size __n, _Generator __gen)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ // "the type returned by a _Generator"
+ __typeof__(__gen())>)
+
+ for ( ; __n > 0; --__n, ++__first)
+ *__first = __gen();
+ return __first;
+ }
+
+ /**
+ * @brief Copy a sequence, removing elements of a given value.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param value The value to be removed.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Copies each element in the range @p [first,last) not equal to @p value
+ * to the range beginning at @p result.
+ * remove_copy() is stable, so the relative order of elements that are
+ * copied is unchanged.
+ */
+ template<typename _InputIterator, typename _OutputIterator, typename _Tp>
+ _OutputIterator
+ remove_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, const _Tp& __value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for ( ; __first != __last; ++__first)
+ if (!(*__first == __value))
+ {
+ *__result = *__first;
+ ++__result;
+ }
+ return __result;
+ }
+
+ /**
+ * @brief Copy a sequence, removing elements for which a predicate is true.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param pred A predicate.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Copies each element in the range @p [first,last) for which
+ * @p pred returns true to the range beginning at @p result.
+ *
+ * remove_copy_if() is stable, so the relative order of elements that are
+ * copied is unchanged.
+ */
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _Predicate>
+ _OutputIterator
+ remove_copy_if(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _Predicate __pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for ( ; __first != __last; ++__first)
+ if (!__pred(*__first))
+ {
+ *__result = *__first;
+ ++__result;
+ }
+ return __result;
+ }
+
+ /**
+ * @brief Remove elements from a sequence.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param value The value to be removed.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * All elements equal to @p value are removed from the range
+ * @p [first,last).
+ *
+ * remove() is stable, so the relative order of elements that are
+ * not removed is unchanged.
+ *
+ * Elements between the end of the resulting sequence and @p last
+ * are still present, but their value is unspecified.
+ */
+ template<typename _ForwardIterator, typename _Tp>
+ _ForwardIterator
+ remove(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ __first = std::find(__first, __last, __value);
+ _ForwardIterator __i = __first;
+ return __first == __last ? __first
+ : std::remove_copy(++__i, __last,
+ __first, __value);
+ }
+
+ /**
+ * @brief Remove elements from a sequence using a predicate.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param pred A predicate.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * All elements for which @p pred returns true are removed from the range
+ * @p [first,last).
+ *
+ * remove_if() is stable, so the relative order of elements that are
+ * not removed is unchanged.
+ *
+ * Elements between the end of the resulting sequence and @p last
+ * are still present, but their value is unspecified.
+ */
+ template<typename _ForwardIterator, typename _Predicate>
+ _ForwardIterator
+ remove_if(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ __first = std::find_if(__first, __last, __pred);
+ _ForwardIterator __i = __first;
+ return __first == __last ? __first
+ : std::remove_copy_if(++__i, __last,
+ __first, __pred);
+ }
+
+ /**
+ * @if maint
+ * This is an uglified unique_copy(_InputIterator, _InputIterator,
+ * _OutputIterator)
+ * overloaded for forward iterators and output iterator as result.
+ * @endif
+ */
+ template<typename _ForwardIterator, typename _OutputIterator>
+ _OutputIterator
+ __unique_copy(_ForwardIterator __first, _ForwardIterator __last,
+ _OutputIterator __result,
+ forward_iterator_tag, output_iterator_tag)
+ {
+ // concept requirements -- taken care of in dispatching function
+ _ForwardIterator __next = __first;
+ *__result = *__first;
+ while (++__next != __last)
+ if (!(*__first == *__next))
+ {
+ __first = __next;
+ *++__result = *__first;
+ }
+ return ++__result;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified unique_copy(_InputIterator, _InputIterator,
+ * _OutputIterator)
+ * overloaded for input iterators and output iterator as result.
+ * @endif
+ */
+ template<typename _InputIterator, typename _OutputIterator>
+ _OutputIterator
+ __unique_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result,
+ input_iterator_tag, output_iterator_tag)
+ {
+ // concept requirements -- taken care of in dispatching function
+ typename iterator_traits<_InputIterator>::value_type __value = *__first;
+ *__result = __value;
+ while (++__first != __last)
+ if (!(__value == *__first))
+ {
+ __value = *__first;
+ *++__result = __value;
+ }
+ return ++__result;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified unique_copy(_InputIterator, _InputIterator,
+ * _OutputIterator)
+ * overloaded for input iterators and forward iterator as result.
+ * @endif
+ */
+ template<typename _InputIterator, typename _ForwardIterator>
+ _ForwardIterator
+ __unique_copy(_InputIterator __first, _InputIterator __last,
+ _ForwardIterator __result,
+ input_iterator_tag, forward_iterator_tag)
+ {
+ // concept requirements -- taken care of in dispatching function
+ *__result = *__first;
+ while (++__first != __last)
+ if (!(*__result == *__first))
+ *++__result = *__first;
+ return ++__result;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified
+ * unique_copy(_InputIterator, _InputIterator, _OutputIterator,
+ * _BinaryPredicate)
+ * overloaded for forward iterators and output iterator as result.
+ * @endif
+ */
+ template<typename _ForwardIterator, typename _OutputIterator,
+ typename _BinaryPredicate>
+ _OutputIterator
+ __unique_copy(_ForwardIterator __first, _ForwardIterator __last,
+ _OutputIterator __result, _BinaryPredicate __binary_pred,
+ forward_iterator_tag, output_iterator_tag)
+ {
+ // concept requirements -- iterators already checked
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+
+ _ForwardIterator __next = __first;
+ *__result = *__first;
+ while (++__next != __last)
+ if (!__binary_pred(*__first, *__next))
+ {
+ __first = __next;
+ *++__result = *__first;
+ }
+ return ++__result;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified
+ * unique_copy(_InputIterator, _InputIterator, _OutputIterator,
+ * _BinaryPredicate)
+ * overloaded for input iterators and output iterator as result.
+ * @endif
+ */
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _BinaryPredicate>
+ _OutputIterator
+ __unique_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _BinaryPredicate __binary_pred,
+ input_iterator_tag, output_iterator_tag)
+ {
+ // concept requirements -- iterators already checked
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_InputIterator>::value_type,
+ typename iterator_traits<_InputIterator>::value_type>)
+
+ typename iterator_traits<_InputIterator>::value_type __value = *__first;
+ *__result = __value;
+ while (++__first != __last)
+ if (!__binary_pred(__value, *__first))
+ {
+ __value = *__first;
+ *++__result = __value;
+ }
+ return ++__result;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified
+ * unique_copy(_InputIterator, _InputIterator, _OutputIterator,
+ * _BinaryPredicate)
+ * overloaded for input iterators and forward iterator as result.
+ * @endif
+ */
+ template<typename _InputIterator, typename _ForwardIterator,
+ typename _BinaryPredicate>
+ _ForwardIterator
+ __unique_copy(_InputIterator __first, _InputIterator __last,
+ _ForwardIterator __result, _BinaryPredicate __binary_pred,
+ input_iterator_tag, forward_iterator_tag)
+ {
+ // concept requirements -- iterators already checked
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_InputIterator>::value_type>)
+
+ *__result = *__first;
+ while (++__first != __last)
+ if (!__binary_pred(*__result, *__first))
+ *++__result = *__first;
+ return ++__result;
+ }
+
+ /**
+ * @brief Copy a sequence, removing consecutive duplicate values.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Copies each element in the range @p [first,last) to the range
+ * beginning at @p result, except that only the first element is copied
+ * from groups of consecutive elements that compare equal.
+ * unique_copy() is stable, so the relative order of elements that are
+ * copied is unchanged.
+ *
+ * @if maint
+ * _GLIBCXX_RESOLVE_LIB_DEFECTS
+ * DR 241. Does unique_copy() require CopyConstructible and Assignable?
+ *
+ * _GLIBCXX_RESOLVE_LIB_DEFECTS
+ * DR 538. 241 again: Does unique_copy() require CopyConstructible and
+ * Assignable?
+ * @endif
+ */
+ template<typename _InputIterator, typename _OutputIterator>
+ inline _OutputIterator
+ unique_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_EqualityComparableConcept<
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __result;
+ return std::__unique_copy(__first, __last, __result,
+ std::__iterator_category(__first),
+ std::__iterator_category(__result));
+ }
+
+ /**
+ * @brief Copy a sequence, removing consecutive values using a predicate.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param binary_pred A binary predicate.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Copies each element in the range @p [first,last) to the range
+ * beginning at @p result, except that only the first element is copied
+ * from groups of consecutive elements for which @p binary_pred returns
+ * true.
+ * unique_copy() is stable, so the relative order of elements that are
+ * copied is unchanged.
+ *
+ * @if maint
+ * _GLIBCXX_RESOLVE_LIB_DEFECTS
+ * DR 241. Does unique_copy() require CopyConstructible and Assignable?
+ * @endif
+ */
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _BinaryPredicate>
+ inline _OutputIterator
+ unique_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result,
+ _BinaryPredicate __binary_pred)
+ {
+ // concept requirements -- predicates checked later
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __result;
+ return std::__unique_copy(__first, __last, __result, __binary_pred,
+ std::__iterator_category(__first),
+ std::__iterator_category(__result));
+ }
+
+ /**
+ * @brief Remove consecutive duplicate values from a sequence.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Removes all but the first element from each group of consecutive
+ * values that compare equal.
+ * unique() is stable, so the relative order of elements that are
+ * not removed is unchanged.
+ * Elements between the end of the resulting sequence and @p last
+ * are still present, but their value is unspecified.
+ */
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ unique(_ForwardIterator __first, _ForwardIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_EqualityComparableConcept<
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ // Skip the beginning, if already unique.
+ __first = std::adjacent_find(__first, __last);
+ if (__first == __last)
+ return __last;
+
+ // Do the real copy work.
+ _ForwardIterator __dest = __first;
+ ++__first;
+ while (++__first != __last)
+ if (!(*__dest == *__first))
+ *++__dest = *__first;
+ return ++__dest;
+ }
+
+ /**
+ * @brief Remove consecutive values from a sequence using a predicate.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param binary_pred A binary predicate.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Removes all but the first element from each group of consecutive
+ * values for which @p binary_pred returns true.
+ * unique() is stable, so the relative order of elements that are
+ * not removed is unchanged.
+ * Elements between the end of the resulting sequence and @p last
+ * are still present, but their value is unspecified.
+ */
+ template<typename _ForwardIterator, typename _BinaryPredicate>
+ _ForwardIterator
+ unique(_ForwardIterator __first, _ForwardIterator __last,
+ _BinaryPredicate __binary_pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ // Skip the beginning, if already unique.
+ __first = std::adjacent_find(__first, __last, __binary_pred);
+ if (__first == __last)
+ return __last;
+
+ // Do the real copy work.
+ _ForwardIterator __dest = __first;
+ ++__first;
+ while (++__first != __last)
+ if (!__binary_pred(*__dest, *__first))
+ *++__dest = *__first;
+ return ++__dest;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified reverse(_BidirectionalIterator,
+ * _BidirectionalIterator)
+ * overloaded for bidirectional iterators.
+ * @endif
+ */
+ template<typename _BidirectionalIterator>
+ void
+ __reverse(_BidirectionalIterator __first, _BidirectionalIterator __last,
+ bidirectional_iterator_tag)
+ {
+ while (true)
+ if (__first == __last || __first == --__last)
+ return;
+ else
+ {
+ std::iter_swap(__first, __last);
+ ++__first;
+ }
+ }
+
+ /**
+ * @if maint
+ * This is an uglified reverse(_BidirectionalIterator,
+ * _BidirectionalIterator)
+ * overloaded for random access iterators.
+ * @endif
+ */
+ template<typename _RandomAccessIterator>
+ void
+ __reverse(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ random_access_iterator_tag)
+ {
+ if (__first == __last)
+ return;
+ --__last;
+ while (__first < __last)
+ {
+ std::iter_swap(__first, __last);
+ ++__first;
+ --__last;
+ }
+ }
+
+ /**
+ * @brief Reverse a sequence.
+ * @param first A bidirectional iterator.
+ * @param last A bidirectional iterator.
+ * @return reverse() returns no value.
+ *
+ * Reverses the order of the elements in the range @p [first,last),
+ * so that the first element becomes the last etc.
+ * For every @c i such that @p 0<=i<=(last-first)/2), @p reverse()
+ * swaps @p *(first+i) and @p *(last-(i+1))
+ */
+ template<typename _BidirectionalIterator>
+ inline void
+ reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_requires_valid_range(__first, __last);
+ std::__reverse(__first, __last, std::__iterator_category(__first));
+ }
+
+ /**
+ * @brief Copy a sequence, reversing its elements.
+ * @param first A bidirectional iterator.
+ * @param last A bidirectional iterator.
+ * @param result An output iterator.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Copies the elements in the range @p [first,last) to the range
+ * @p [result,result+(last-first)) such that the order of the
+ * elements is reversed.
+ * For every @c i such that @p 0<=i<=(last-first), @p reverse_copy()
+ * performs the assignment @p *(result+(last-first)-i) = *(first+i).
+ * The ranges @p [first,last) and @p [result,result+(last-first))
+ * must not overlap.
+ */
+ template<typename _BidirectionalIterator, typename _OutputIterator>
+ _OutputIterator
+ reverse_copy(_BidirectionalIterator __first, _BidirectionalIterator __last,
+ _OutputIterator __result)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ while (__first != __last)
+ {
+ --__last;
+ *__result = *__last;
+ ++__result;
+ }
+ return __result;
+ }
+
+
+ /**
+ * @if maint
+ * This is a helper function for the rotate algorithm specialized on RAIs.
+ * It returns the greatest common divisor of two integer values.
+ * @endif
+ */
+ template<typename _EuclideanRingElement>
+ _EuclideanRingElement
+ __gcd(_EuclideanRingElement __m, _EuclideanRingElement __n)
+ {
+ while (__n != 0)
+ {
+ _EuclideanRingElement __t = __m % __n;
+ __m = __n;
+ __n = __t;
+ }
+ return __m;
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the rotate algorithm.
+ * @endif
+ */
+ template<typename _ForwardIterator>
+ void
+ __rotate(_ForwardIterator __first,
+ _ForwardIterator __middle,
+ _ForwardIterator __last,
+ forward_iterator_tag)
+ {
+ if (__first == __middle || __last == __middle)
+ return;
+
+ _ForwardIterator __first2 = __middle;
+ do
+ {
+ swap(*__first, *__first2);
+ ++__first;
+ ++__first2;
+ if (__first == __middle)
+ __middle = __first2;
+ }
+ while (__first2 != __last);
+
+ __first2 = __middle;
+
+ while (__first2 != __last)
+ {
+ swap(*__first, *__first2);
+ ++__first;
+ ++__first2;
+ if (__first == __middle)
+ __middle = __first2;
+ else if (__first2 == __last)
+ __first2 = __middle;
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the rotate algorithm.
+ * @endif
+ */
+ template<typename _BidirectionalIterator>
+ void
+ __rotate(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ bidirectional_iterator_tag)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+
+ if (__first == __middle || __last == __middle)
+ return;
+
+ std::__reverse(__first, __middle, bidirectional_iterator_tag());
+ std::__reverse(__middle, __last, bidirectional_iterator_tag());
+
+ while (__first != __middle && __middle != __last)
+ {
+ swap(*__first, *--__last);
+ ++__first;
+ }
+
+ if (__first == __middle)
+ std::__reverse(__middle, __last, bidirectional_iterator_tag());
+ else
+ std::__reverse(__first, __middle, bidirectional_iterator_tag());
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the rotate algorithm.
+ * @endif
+ */
+ template<typename _RandomAccessIterator>
+ void
+ __rotate(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last,
+ random_access_iterator_tag)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+
+ if (__first == __middle || __last == __middle)
+ return;
+
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _Distance;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ const _Distance __n = __last - __first;
+ const _Distance __k = __middle - __first;
+ const _Distance __l = __n - __k;
+
+ if (__k == __l)
+ {
+ std::swap_ranges(__first, __middle, __middle);
+ return;
+ }
+
+ const _Distance __d = __gcd(__n, __k);
+
+ for (_Distance __i = 0; __i < __d; __i++)
+ {
+ _ValueType __tmp = *__first;
+ _RandomAccessIterator __p = __first;
+
+ if (__k < __l)
+ {
+ for (_Distance __j = 0; __j < __l / __d; __j++)
+ {
+ if (__p > __first + __l)
+ {
+ *__p = *(__p - __l);
+ __p -= __l;
+ }
+
+ *__p = *(__p + __k);
+ __p += __k;
+ }
+ }
+ else
+ {
+ for (_Distance __j = 0; __j < __k / __d - 1; __j ++)
+ {
+ if (__p < __last - __k)
+ {
+ *__p = *(__p + __k);
+ __p += __k;
+ }
+ *__p = * (__p - __l);
+ __p -= __l;
+ }
+ }
+
+ *__p = __tmp;
+ ++__first;
+ }
+ }
+
+ /**
+ * @brief Rotate the elements of a sequence.
+ * @param first A forward iterator.
+ * @param middle A forward iterator.
+ * @param last A forward iterator.
+ * @return Nothing.
+ *
+ * Rotates the elements of the range @p [first,last) by @p (middle-first)
+ * positions so that the element at @p middle is moved to @p first, the
+ * element at @p middle+1 is moved to @first+1 and so on for each element
+ * in the range @p [first,last).
+ *
+ * This effectively swaps the ranges @p [first,middle) and
+ * @p [middle,last).
+ *
+ * Performs @p *(first+(n+(last-middle))%(last-first))=*(first+n) for
+ * each @p n in the range @p [0,last-first).
+ */
+ template<typename _ForwardIterator>
+ inline void
+ rotate(_ForwardIterator __first, _ForwardIterator __middle,
+ _ForwardIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_requires_valid_range(__first, __middle);
+ __glibcxx_requires_valid_range(__middle, __last);
+
+ typedef typename iterator_traits<_ForwardIterator>::iterator_category
+ _IterType;
+ std::__rotate(__first, __middle, __last, _IterType());
+ }
+
+ /**
+ * @brief Copy a sequence, rotating its elements.
+ * @param first A forward iterator.
+ * @param middle A forward iterator.
+ * @param last A forward iterator.
+ * @param result An output iterator.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Copies the elements of the range @p [first,last) to the range
+ * beginning at @result, rotating the copied elements by @p (middle-first)
+ * positions so that the element at @p middle is moved to @p result, the
+ * element at @p middle+1 is moved to @result+1 and so on for each element
+ * in the range @p [first,last).
+ *
+ * Performs @p *(result+(n+(last-middle))%(last-first))=*(first+n) for
+ * each @p n in the range @p [0,last-first).
+ */
+ template<typename _ForwardIterator, typename _OutputIterator>
+ _OutputIterator
+ rotate_copy(_ForwardIterator __first, _ForwardIterator __middle,
+ _ForwardIterator __last, _OutputIterator __result)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __middle);
+ __glibcxx_requires_valid_range(__middle, __last);
+
+ return std::copy(__first, __middle,
+ std::copy(__middle, __last, __result));
+ }
+
+ /**
+ * @brief Randomly shuffle the elements of a sequence.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @return Nothing.
+ *
+ * Reorder the elements in the range @p [first,last) using a random
+ * distribution, so that every possible ordering of the sequence is
+ * equally likely.
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first != __last)
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
+ std::iter_swap(__i, __first + (std::rand() % ((__i - __first) + 1)));
+ }
+
+ /**
+ * @brief Shuffle the elements of a sequence using a random number
+ * generator.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param rand The RNG functor or function.
+ * @return Nothing.
+ *
+ * Reorders the elements in the range @p [first,last) using @p rand to
+ * provide a random distribution. Calling @p rand(N) for a positive
+ * integer @p N should return a randomly chosen integer from the
+ * range [0,N).
+ */
+ template<typename _RandomAccessIterator, typename _RandomNumberGenerator>
+ void
+ random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _RandomNumberGenerator& __rand)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return;
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
+ std::iter_swap(__i, __first + __rand((__i - __first) + 1));
+ }
+
+
+ /**
+ * @if maint
+ * This is a helper function...
+ * @endif
+ */
+ template<typename _ForwardIterator, typename _Predicate>
+ _ForwardIterator
+ __partition(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred,
+ forward_iterator_tag)
+ {
+ if (__first == __last)
+ return __first;
+
+ while (__pred(*__first))
+ if (++__first == __last)
+ return __first;
+
+ _ForwardIterator __next = __first;
+
+ while (++__next != __last)
+ if (__pred(*__next))
+ {
+ swap(*__first, *__next);
+ ++__first;
+ }
+
+ return __first;
+ }
+
+ /**
+ * @if maint
+ * This is a helper function...
+ * @endif
+ */
+ template<typename _BidirectionalIterator, typename _Predicate>
+ _BidirectionalIterator
+ __partition(_BidirectionalIterator __first, _BidirectionalIterator __last,
+ _Predicate __pred,
+ bidirectional_iterator_tag)
+ {
+ while (true)
+ {
+ while (true)
+ if (__first == __last)
+ return __first;
+ else if (__pred(*__first))
+ ++__first;
+ else
+ break;
+ --__last;
+ while (true)
+ if (__first == __last)
+ return __first;
+ else if (!__pred(*__last))
+ --__last;
+ else
+ break;
+ std::iter_swap(__first, __last);
+ ++__first;
+ }
+ }
+
+ /**
+ * @brief Move elements for which a predicate is true to the beginning
+ * of a sequence.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param pred A predicate functor.
+ * @return An iterator @p middle such that @p pred(i) is true for each
+ * iterator @p i in the range @p [first,middle) and false for each @p i
+ * in the range @p [middle,last).
+ *
+ * @p pred must not modify its operand. @p partition() does not preserve
+ * the relative ordering of elements in each group, use
+ * @p stable_partition() if this is needed.
+ */
+ template<typename _ForwardIterator, typename _Predicate>
+ inline _ForwardIterator
+ partition(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ return std::__partition(__first, __last, __pred,
+ std::__iterator_category(__first));
+ }
+
+
+ /**
+ * @if maint
+ * This is a helper function...
+ * @endif
+ */
+ template<typename _ForwardIterator, typename _Predicate, typename _Distance>
+ _ForwardIterator
+ __inplace_stable_partition(_ForwardIterator __first,
+ _ForwardIterator __last,
+ _Predicate __pred, _Distance __len)
+ {
+ if (__len == 1)
+ return __pred(*__first) ? __last : __first;
+ _ForwardIterator __middle = __first;
+ std::advance(__middle, __len / 2);
+ _ForwardIterator __begin = std::__inplace_stable_partition(__first,
+ __middle,
+ __pred,
+ __len / 2);
+ _ForwardIterator __end = std::__inplace_stable_partition(__middle, __last,
+ __pred,
+ __len
+ - __len / 2);
+ std::rotate(__begin, __middle, __end);
+ std::advance(__begin, std::distance(__middle, __end));
+ return __begin;
+ }
+
+ /**
+ * @if maint
+ * This is a helper function...
+ * @endif
+ */
+ template<typename _ForwardIterator, typename _Pointer, typename _Predicate,
+ typename _Distance>
+ _ForwardIterator
+ __stable_partition_adaptive(_ForwardIterator __first,
+ _ForwardIterator __last,
+ _Predicate __pred, _Distance __len,
+ _Pointer __buffer,
+ _Distance __buffer_size)
+ {
+ if (__len <= __buffer_size)
+ {
+ _ForwardIterator __result1 = __first;
+ _Pointer __result2 = __buffer;
+ for ( ; __first != __last ; ++__first)
+ if (__pred(*__first))
+ {
+ *__result1 = *__first;
+ ++__result1;
+ }
+ else
+ {
+ *__result2 = *__first;
+ ++__result2;
+ }
+ std::copy(__buffer, __result2, __result1);
+ return __result1;
+ }
+ else
+ {
+ _ForwardIterator __middle = __first;
+ std::advance(__middle, __len / 2);
+ _ForwardIterator __begin =
+ std::__stable_partition_adaptive(__first, __middle, __pred,
+ __len / 2, __buffer,
+ __buffer_size);
+ _ForwardIterator __end =
+ std::__stable_partition_adaptive(__middle, __last, __pred,
+ __len - __len / 2,
+ __buffer, __buffer_size);
+ std::rotate(__begin, __middle, __end);
+ std::advance(__begin, std::distance(__middle, __end));
+ return __begin;
+ }
+ }
+
+ /**
+ * @brief Move elements for which a predicate is true to the beginning
+ * of a sequence, preserving relative ordering.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param pred A predicate functor.
+ * @return An iterator @p middle such that @p pred(i) is true for each
+ * iterator @p i in the range @p [first,middle) and false for each @p i
+ * in the range @p [middle,last).
+ *
+ * Performs the same function as @p partition() with the additional
+ * guarantee that the relative ordering of elements in each group is
+ * preserved, so any two elements @p x and @p y in the range
+ * @p [first,last) such that @p pred(x)==pred(y) will have the same
+ * relative ordering after calling @p stable_partition().
+ */
+ template<typename _ForwardIterator, typename _Predicate>
+ _ForwardIterator
+ stable_partition(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __first;
+ else
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ _Temporary_buffer<_ForwardIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.size() > 0)
+ return
+ std::__stable_partition_adaptive(__first, __last, __pred,
+ _DistanceType(__buf.requested_size()),
+ __buf.begin(), __buf.size());
+ else
+ return
+ std::__inplace_stable_partition(__first, __last, __pred,
+ _DistanceType(__buf.requested_size()));
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function...
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Tp>
+ _RandomAccessIterator
+ __unguarded_partition(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Tp __pivot)
+ {
+ while (true)
+ {
+ while (*__first < __pivot)
+ ++__first;
+ --__last;
+ while (__pivot < *__last)
+ --__last;
+ if (!(__first < __last))
+ return __first;
+ std::iter_swap(__first, __last);
+ ++__first;
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function...
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
+ _RandomAccessIterator
+ __unguarded_partition(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Tp __pivot, _Compare __comp)
+ {
+ while (true)
+ {
+ while (__comp(*__first, __pivot))
+ ++__first;
+ --__last;
+ while (__comp(__pivot, *__last))
+ --__last;
+ if (!(__first < __last))
+ return __first;
+ std::iter_swap(__first, __last);
+ ++__first;
+ }
+ }
+
+ /**
+ * @if maint
+ * @doctodo
+ * This controls some aspect of the sort routines.
+ * @endif
+ */
+ enum { _S_threshold = 16 };
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Tp>
+ void
+ __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val)
+ {
+ _RandomAccessIterator __next = __last;
+ --__next;
+ while (__val < *__next)
+ {
+ *__last = *__next;
+ __last = __next;
+ --__next;
+ }
+ *__last = __val;
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
+ void
+ __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val,
+ _Compare __comp)
+ {
+ _RandomAccessIterator __next = __last;
+ --__next;
+ while (__comp(__val, *__next))
+ {
+ *__last = *__next;
+ __last = __next;
+ --__next;
+ }
+ *__last = __val;
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator>
+ void
+ __insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
+ {
+ if (__first == __last)
+ return;
+
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
+ {
+ typename iterator_traits<_RandomAccessIterator>::value_type
+ __val = *__i;
+ if (__val < *__first)
+ {
+ std::copy_backward(__first, __i, __i + 1);
+ *__first = __val;
+ }
+ else
+ std::__unguarded_linear_insert(__i, __val);
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ void
+ __insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ if (__first == __last) return;
+
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
+ {
+ typename iterator_traits<_RandomAccessIterator>::value_type
+ __val = *__i;
+ if (__comp(__val, *__first))
+ {
+ std::copy_backward(__first, __i, __i + 1);
+ *__first = __val;
+ }
+ else
+ std::__unguarded_linear_insert(__i, __val, __comp);
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ __unguarded_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
+ std::__unguarded_linear_insert(__i, _ValueType(*__i));
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ __unguarded_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
+ std::__unguarded_linear_insert(__i, _ValueType(*__i), __comp);
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator>
+ void
+ __final_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
+ {
+ if (__last - __first > int(_S_threshold))
+ {
+ std::__insertion_sort(__first, __first + int(_S_threshold));
+ std::__unguarded_insertion_sort(__first + int(_S_threshold), __last);
+ }
+ else
+ std::__insertion_sort(__first, __last);
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ void
+ __final_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ if (__last - __first > int(_S_threshold))
+ {
+ std::__insertion_sort(__first, __first + int(_S_threshold), __comp);
+ std::__unguarded_insertion_sort(__first + int(_S_threshold), __last,
+ __comp);
+ }
+ else
+ std::__insertion_sort(__first, __last, __comp);
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routines.
+ * @endif
+ */
+ template<typename _RandomAccessIterator>
+ void
+ __heap_select(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ std::make_heap(__first, __middle);
+ for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
+ if (*__i < *__first)
+ std::__pop_heap(__first, __middle, __i, _ValueType(*__i));
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routines.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ void
+ __heap_select(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ std::make_heap(__first, __middle, __comp);
+ for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
+ if (__comp(*__i, *__first))
+ std::__pop_heap(__first, __middle, __i, _ValueType(*__i), __comp);
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routines.
+ * @endif
+ */
+ template<typename _Size>
+ inline _Size
+ __lg(_Size __n)
+ {
+ _Size __k;
+ for (__k = 0; __n != 1; __n >>= 1)
+ ++__k;
+ return __k;
+ }
+
+ /**
+ * @brief Sort the smallest elements of a sequence.
+ * @param first An iterator.
+ * @param middle Another iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Sorts the smallest @p (middle-first) elements in the range
+ * @p [first,last) and moves them to the range @p [first,middle). The
+ * order of the remaining elements in the range @p [middle,last) is
+ * undefined.
+ * After the sort if @p i and @j are iterators in the range
+ * @p [first,middle) such that @i precedes @j and @k is an iterator in
+ * the range @p [middle,last) then @p *j<*i and @p *k<*i are both false.
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ partial_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __middle);
+ __glibcxx_requires_valid_range(__middle, __last);
+
+ std::__heap_select(__first, __middle, __last);
+ std::sort_heap(__first, __middle);
+ }
+
+ /**
+ * @brief Sort the smallest elements of a sequence using a predicate
+ * for comparison.
+ * @param first An iterator.
+ * @param middle Another iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
+ *
+ * Sorts the smallest @p (middle-first) elements in the range
+ * @p [first,last) and moves them to the range @p [first,middle). The
+ * order of the remaining elements in the range @p [middle,last) is
+ * undefined.
+ * After the sort if @p i and @j are iterators in the range
+ * @p [first,middle) such that @i precedes @j and @k is an iterator in
+ * the range @p [middle,last) then @p *comp(j,*i) and @p comp(*k,*i)
+ * are both false.
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ partial_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _ValueType>)
+ __glibcxx_requires_valid_range(__first, __middle);
+ __glibcxx_requires_valid_range(__middle, __last);
+
+ std::__heap_select(__first, __middle, __last, __comp);
+ std::sort_heap(__first, __middle, __comp);
+ }
+
+ /**
+ * @brief Copy the smallest elements of a sequence.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param result_first A random-access iterator.
+ * @param result_last Another random-access iterator.
+ * @return An iterator indicating the end of the resulting sequence.
+ *
+ * Copies and sorts the smallest N values from the range @p [first,last)
+ * to the range beginning at @p result_first, where the number of
+ * elements to be copied, @p N, is the smaller of @p (last-first) and
+ * @p (result_last-result_first).
+ * After the sort if @p i and @j are iterators in the range
+ * @p [result_first,result_first+N) such that @i precedes @j then
+ * @p *j<*i is false.
+ * The value returned is @p result_first+N.
+ */
+ template<typename _InputIterator, typename _RandomAccessIterator>
+ _RandomAccessIterator
+ partial_sort_copy(_InputIterator __first, _InputIterator __last,
+ _RandomAccessIterator __result_first,
+ _RandomAccessIterator __result_last)
+ {
+ typedef typename iterator_traits<_InputIterator>::value_type
+ _InputValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _OutputValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_ConvertibleConcept<_InputValueType,
+ _OutputValueType>)
+ __glibcxx_function_requires(_LessThanOpConcept<_InputValueType,
+ _OutputValueType>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_OutputValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+ __glibcxx_requires_valid_range(__result_first, __result_last);
+
+ if (__result_first == __result_last)
+ return __result_last;
+ _RandomAccessIterator __result_real_last = __result_first;
+ while(__first != __last && __result_real_last != __result_last)
+ {
+ *__result_real_last = *__first;
+ ++__result_real_last;
+ ++__first;
+ }
+ std::make_heap(__result_first, __result_real_last);
+ while (__first != __last)
+ {
+ if (*__first < *__result_first)
+ std::__adjust_heap(__result_first, _DistanceType(0),
+ _DistanceType(__result_real_last
+ - __result_first),
+ _InputValueType(*__first));
+ ++__first;
+ }
+ std::sort_heap(__result_first, __result_real_last);
+ return __result_real_last;
+ }
+
+ /**
+ * @brief Copy the smallest elements of a sequence using a predicate for
+ * comparison.
+ * @param first An input iterator.
+ * @param last Another input iterator.
+ * @param result_first A random-access iterator.
+ * @param result_last Another random-access iterator.
+ * @param comp A comparison functor.
+ * @return An iterator indicating the end of the resulting sequence.
+ *
+ * Copies and sorts the smallest N values from the range @p [first,last)
+ * to the range beginning at @p result_first, where the number of
+ * elements to be copied, @p N, is the smaller of @p (last-first) and
+ * @p (result_last-result_first).
+ * After the sort if @p i and @j are iterators in the range
+ * @p [result_first,result_first+N) such that @i precedes @j then
+ * @p comp(*j,*i) is false.
+ * The value returned is @p result_first+N.
+ */
+ template<typename _InputIterator, typename _RandomAccessIterator, typename _Compare>
+ _RandomAccessIterator
+ partial_sort_copy(_InputIterator __first, _InputIterator __last,
+ _RandomAccessIterator __result_first,
+ _RandomAccessIterator __result_last,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator>::value_type
+ _InputValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _OutputValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_ConvertibleConcept<_InputValueType,
+ _OutputValueType>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _InputValueType, _OutputValueType>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _OutputValueType, _OutputValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+ __glibcxx_requires_valid_range(__result_first, __result_last);
+
+ if (__result_first == __result_last)
+ return __result_last;
+ _RandomAccessIterator __result_real_last = __result_first;
+ while(__first != __last && __result_real_last != __result_last)
+ {
+ *__result_real_last = *__first;
+ ++__result_real_last;
+ ++__first;
+ }
+ std::make_heap(__result_first, __result_real_last, __comp);
+ while (__first != __last)
+ {
+ if (__comp(*__first, *__result_first))
+ std::__adjust_heap(__result_first, _DistanceType(0),
+ _DistanceType(__result_real_last
+ - __result_first),
+ _InputValueType(*__first),
+ __comp);
+ ++__first;
+ }
+ std::sort_heap(__result_first, __result_real_last, __comp);
+ return __result_real_last;
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Size>
+ void
+ __introsort_loop(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Size __depth_limit)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ while (__last - __first > int(_S_threshold))
+ {
+ if (__depth_limit == 0)
+ {
+ std::partial_sort(__first, __last, __last);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition(__first, __last,
+ _ValueType(std::__median(*__first,
+ *(__first
+ + (__last
+ - __first)
+ / 2),
+ *(__last
+ - 1))));
+ std::__introsort_loop(__cut, __last, __depth_limit);
+ __last = __cut;
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Size, typename _Compare>
+ void
+ __introsort_loop(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Size __depth_limit, _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ while (__last - __first > int(_S_threshold))
+ {
+ if (__depth_limit == 0)
+ {
+ std::partial_sort(__first, __last, __last, __comp);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition(__first, __last,
+ _ValueType(std::__median(*__first,
+ *(__first
+ + (__last
+ - __first)
+ / 2),
+ *(__last - 1),
+ __comp)),
+ __comp);
+ std::__introsort_loop(__cut, __last, __depth_limit, __comp);
+ __last = __cut;
+ }
+ }
+
+ /**
+ * @brief Sort the elements of a sequence.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p *(i+1)<*i is false for each iterator @p i in the range
+ * @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is not preserved, use
+ * @p stable_sort() if this is needed.
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first != __last)
+ {
+ std::__introsort_loop(__first, __last,
+ std::__lg(__last - __first) * 2);
+ std::__final_insertion_sort(__first, __last);
+ }
+ }
+
+ /**
+ * @brief Sort the elements of a sequence using a predicate for comparison.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
+ *
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p comp(*(i+1),*i) is false for every iterator @p i in the
+ * range @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is not preserved, use
+ * @p stable_sort() if this is needed.
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _ValueType,
+ _ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first != __last)
+ {
+ std::__introsort_loop(__first, __last,
+ std::__lg(__last - __first) * 2, __comp);
+ std::__final_insertion_sort(__first, __last, __comp);
+ }
+ }
+
+ /**
+ * @brief Finds the first position in which @a val could be inserted
+ * without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @return An iterator pointing to the first element "not less than" @a val,
+ * or end() if every element is less than @a val.
+ * @ingroup binarysearch
+ */
+ template<typename _ForwardIterator, typename _Tp>
+ _ForwardIterator
+ lower_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>)
+ __glibcxx_requires_partitioned(__first, __last, __val);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (*__middle < __val)
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ else
+ __len = __half;
+ }
+ return __first;
+ }
+
+ /**
+ * @brief Finds the first position in which @a val could be inserted
+ * without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @param comp A functor to use for comparisons.
+ * @return An iterator pointing to the first element "not less than" @a val,
+ * or end() if every element is less than @a val.
+ * @ingroup binarysearch
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
+ */
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ _ForwardIterator
+ lower_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val, _Compare __comp)
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _Tp>)
+ __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__comp(*__middle, __val))
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ else
+ __len = __half;
+ }
+ return __first;
+ }
+
+ /**
+ * @brief Finds the last position in which @a val could be inserted
+ * without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @return An iterator pointing to the first element greater than @a val,
+ * or end() if no elements are greater than @a val.
+ * @ingroup binarysearch
+ */
+ template<typename _ForwardIterator, typename _Tp>
+ _ForwardIterator
+ upper_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
+ __glibcxx_requires_partitioned(__first, __last, __val);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__val < *__middle)
+ __len = __half;
+ else
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ }
+ return __first;
+ }
+
+ /**
+ * @brief Finds the last position in which @a val could be inserted
+ * without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @param comp A functor to use for comparisons.
+ * @return An iterator pointing to the first element greater than @a val,
+ * or end() if no elements are greater than @a val.
+ * @ingroup binarysearch
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
+ */
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ _ForwardIterator
+ upper_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val, _Compare __comp)
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _Tp, _ValueType>)
+ __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__comp(__val, *__middle))
+ __len = __half;
+ else
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ }
+ return __first;
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator, typename _Distance>
+ void
+ __merge_without_buffer(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2)
+ {
+ if (__len1 == 0 || __len2 == 0)
+ return;
+ if (__len1 + __len2 == 2)
+ {
+ if (*__middle < *__first)
+ std::iter_swap(__first, __middle);
+ return;
+ }
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last, *__first_cut);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle, *__second_cut);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ std::rotate(__first_cut, __middle, __second_cut);
+ _BidirectionalIterator __new_middle = __first_cut;
+ std::advance(__new_middle, std::distance(__middle, __second_cut));
+ std::__merge_without_buffer(__first, __first_cut, __new_middle,
+ __len11, __len22);
+ std::__merge_without_buffer(__new_middle, __second_cut, __last,
+ __len1 - __len11, __len2 - __len22);
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator, typename _Distance,
+ typename _Compare>
+ void
+ __merge_without_buffer(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2,
+ _Compare __comp)
+ {
+ if (__len1 == 0 || __len2 == 0)
+ return;
+ if (__len1 + __len2 == 2)
+ {
+ if (__comp(*__middle, *__first))
+ std::iter_swap(__first, __middle);
+ return;
+ }
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last, *__first_cut,
+ __comp);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle, *__second_cut,
+ __comp);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ std::rotate(__first_cut, __middle, __second_cut);
+ _BidirectionalIterator __new_middle = __first_cut;
+ std::advance(__new_middle, std::distance(__middle, __second_cut));
+ std::__merge_without_buffer(__first, __first_cut, __new_middle,
+ __len11, __len22, __comp);
+ std::__merge_without_buffer(__new_middle, __second_cut, __last,
+ __len1 - __len11, __len2 - __len22, __comp);
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the stable sorting routines.
+ * @endif
+ */
+ template<typename _RandomAccessIterator>
+ void
+ __inplace_stable_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
+ {
+ if (__last - __first < 15)
+ {
+ std::__insertion_sort(__first, __last);
+ return;
+ }
+ _RandomAccessIterator __middle = __first + (__last - __first) / 2;
+ std::__inplace_stable_sort(__first, __middle);
+ std::__inplace_stable_sort(__middle, __last);
+ std::__merge_without_buffer(__first, __middle, __last,
+ __middle - __first,
+ __last - __middle);
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the stable sorting routines.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ void
+ __inplace_stable_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ if (__last - __first < 15)
+ {
+ std::__insertion_sort(__first, __last, __comp);
+ return;
+ }
+ _RandomAccessIterator __middle = __first + (__last - __first) / 2;
+ std::__inplace_stable_sort(__first, __middle, __comp);
+ std::__inplace_stable_sort(__middle, __last, __comp);
+ std::__merge_without_buffer(__first, __middle, __last,
+ __middle - __first,
+ __last - __middle,
+ __comp);
+ }
+
+ /**
+ * @brief Merges two sorted ranges.
+ * @param first1 An iterator.
+ * @param first2 Another iterator.
+ * @param last1 Another iterator.
+ * @param last2 Another iterator.
+ * @param result An iterator pointing to the end of the merged range.
+ * @return An iterator pointing to the first element "not less than" @a val.
+ *
+ * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
+ * [result, result + (last1-first1) + (last2-first2)). Both input ranges
+ * must be sorted, and the output range must not overlap with either of
+ * the input ranges. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ merge(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted(__first1, __last1);
+ __glibcxx_requires_sorted(__first2, __last2);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ {
+ if (*__first2 < *__first1)
+ {
+ *__result = *__first2;
+ ++__first2;
+ }
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ ++__result;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
+ }
+
+ /**
+ * @brief Merges two sorted ranges.
+ * @param first1 An iterator.
+ * @param first2 Another iterator.
+ * @param last1 Another iterator.
+ * @param last2 Another iterator.
+ * @param result An iterator pointing to the end of the merged range.
+ * @param comp A functor to use for comparisons.
+ * @return An iterator pointing to the first element "not less than" @a val.
+ *
+ * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
+ * [result, result + (last1-first1) + (last2-first2)). Both input ranges
+ * must be sorted, and the output range must not overlap with either of
+ * the input ranges. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ merge(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result, _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
+ __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ {
+ if (__comp(*__first2, *__first1))
+ {
+ *__result = *__first2;
+ ++__first2;
+ }
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ ++__result;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
+ }
+
+ template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
+ typename _Distance>
+ void
+ __merge_sort_loop(_RandomAccessIterator1 __first,
+ _RandomAccessIterator1 __last,
+ _RandomAccessIterator2 __result,
+ _Distance __step_size)
+ {
+ const _Distance __two_step = 2 * __step_size;
+
+ while (__last - __first >= __two_step)
+ {
+ __result = std::merge(__first, __first + __step_size,
+ __first + __step_size, __first + __two_step,
+ __result);
+ __first += __two_step;
+ }
+
+ __step_size = std::min(_Distance(__last - __first), __step_size);
+ std::merge(__first, __first + __step_size, __first + __step_size, __last,
+ __result);
+ }
+
+ template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
+ typename _Distance, typename _Compare>
+ void
+ __merge_sort_loop(_RandomAccessIterator1 __first,
+ _RandomAccessIterator1 __last,
+ _RandomAccessIterator2 __result, _Distance __step_size,
+ _Compare __comp)
+ {
+ const _Distance __two_step = 2 * __step_size;
+
+ while (__last - __first >= __two_step)
+ {
+ __result = std::merge(__first, __first + __step_size,
+ __first + __step_size, __first + __two_step,
+ __result,
+ __comp);
+ __first += __two_step;
+ }
+ __step_size = std::min(_Distance(__last - __first), __step_size);
+
+ std::merge(__first, __first + __step_size,
+ __first + __step_size, __last,
+ __result,
+ __comp);
+ }
+
+ enum { _S_chunk_size = 7 };
+
+ template<typename _RandomAccessIterator, typename _Distance>
+ void
+ __chunk_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Distance __chunk_size)
+ {
+ while (__last - __first >= __chunk_size)
+ {
+ std::__insertion_sort(__first, __first + __chunk_size);
+ __first += __chunk_size;
+ }
+ std::__insertion_sort(__first, __last);
+ }
+
+ template<typename _RandomAccessIterator, typename _Distance, typename _Compare>
+ void
+ __chunk_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Distance __chunk_size, _Compare __comp)
+ {
+ while (__last - __first >= __chunk_size)
+ {
+ std::__insertion_sort(__first, __first + __chunk_size, __comp);
+ __first += __chunk_size;
+ }
+ std::__insertion_sort(__first, __last, __comp);
+ }
+
+ template<typename _RandomAccessIterator, typename _Pointer>
+ void
+ __merge_sort_with_buffer(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _Distance;
+
+ const _Distance __len = __last - __first;
+ const _Pointer __buffer_last = __buffer + __len;
+
+ _Distance __step_size = _S_chunk_size;
+ std::__chunk_insertion_sort(__first, __last, __step_size);
+
+ while (__step_size < __len)
+ {
+ std::__merge_sort_loop(__first, __last, __buffer, __step_size);
+ __step_size *= 2;
+ std::__merge_sort_loop(__buffer, __buffer_last, __first, __step_size);
+ __step_size *= 2;
+ }
+ }
+
+ template<typename _RandomAccessIterator, typename _Pointer, typename _Compare>
+ void
+ __merge_sort_with_buffer(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _Distance;
+
+ const _Distance __len = __last - __first;
+ const _Pointer __buffer_last = __buffer + __len;
+
+ _Distance __step_size = _S_chunk_size;
+ std::__chunk_insertion_sort(__first, __last, __step_size, __comp);
+
+ while (__step_size < __len)
+ {
+ std::__merge_sort_loop(__first, __last, __buffer,
+ __step_size, __comp);
+ __step_size *= 2;
+ std::__merge_sort_loop(__buffer, __buffer_last, __first,
+ __step_size, __comp);
+ __step_size *= 2;
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
+ typename _BidirectionalIterator3>
+ _BidirectionalIterator3
+ __merge_backward(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ _BidirectionalIterator3 __result)
+ {
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, __last2, __result);
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, __last1, __result);
+ --__last1;
+ --__last2;
+ while (true)
+ {
+ if (*__last2 < *__last1)
+ {
+ *--__result = *__last1;
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, ++__last2, __result);
+ --__last1;
+ }
+ else
+ {
+ *--__result = *__last2;
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, ++__last1, __result);
+ --__last2;
+ }
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
+ typename _BidirectionalIterator3, typename _Compare>
+ _BidirectionalIterator3
+ __merge_backward(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ _BidirectionalIterator3 __result,
+ _Compare __comp)
+ {
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, __last2, __result);
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, __last1, __result);
+ --__last1;
+ --__last2;
+ while (true)
+ {
+ if (__comp(*__last2, *__last1))
+ {
+ *--__result = *__last1;
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, ++__last2, __result);
+ --__last1;
+ }
+ else
+ {
+ *--__result = *__last2;
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, ++__last1, __result);
+ --__last2;
+ }
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
+ typename _Distance>
+ _BidirectionalIterator1
+ __rotate_adaptive(_BidirectionalIterator1 __first,
+ _BidirectionalIterator1 __middle,
+ _BidirectionalIterator1 __last,
+ _Distance __len1, _Distance __len2,
+ _BidirectionalIterator2 __buffer,
+ _Distance __buffer_size)
+ {
+ _BidirectionalIterator2 __buffer_end;
+ if (__len1 > __len2 && __len2 <= __buffer_size)
+ {
+ __buffer_end = std::copy(__middle, __last, __buffer);
+ std::copy_backward(__first, __middle, __last);
+ return std::copy(__buffer, __buffer_end, __first);
+ }
+ else if (__len1 <= __buffer_size)
+ {
+ __buffer_end = std::copy(__first, __middle, __buffer);
+ std::copy(__middle, __last, __first);
+ return std::copy_backward(__buffer, __buffer_end, __last);
+ }
+ else
+ {
+ std::rotate(__first, __middle, __last);
+ std::advance(__first, std::distance(__middle, __last));
+ return __first;
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator, typename _Distance,
+ typename _Pointer>
+ void
+ __merge_adaptive(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2,
+ _Pointer __buffer, _Distance __buffer_size)
+ {
+ if (__len1 <= __len2 && __len1 <= __buffer_size)
+ {
+ _Pointer __buffer_end = std::copy(__first, __middle, __buffer);
+ std::merge(__buffer, __buffer_end, __middle, __last, __first);
+ }
+ else if (__len2 <= __buffer_size)
+ {
+ _Pointer __buffer_end = std::copy(__middle, __last, __buffer);
+ std::__merge_backward(__first, __middle, __buffer,
+ __buffer_end, __last);
+ }
+ else
+ {
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last,
+ *__first_cut);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle,
+ *__second_cut);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ _BidirectionalIterator __new_middle =
+ std::__rotate_adaptive(__first_cut, __middle, __second_cut,
+ __len1 - __len11, __len22, __buffer,
+ __buffer_size);
+ std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
+ __len22, __buffer, __buffer_size);
+ std::__merge_adaptive(__new_middle, __second_cut, __last,
+ __len1 - __len11,
+ __len2 - __len22, __buffer, __buffer_size);
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator, typename _Distance, typename _Pointer,
+ typename _Compare>
+ void
+ __merge_adaptive(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2,
+ _Pointer __buffer, _Distance __buffer_size,
+ _Compare __comp)
+ {
+ if (__len1 <= __len2 && __len1 <= __buffer_size)
+ {
+ _Pointer __buffer_end = std::copy(__first, __middle, __buffer);
+ std::merge(__buffer, __buffer_end, __middle, __last, __first, __comp);
+ }
+ else if (__len2 <= __buffer_size)
+ {
+ _Pointer __buffer_end = std::copy(__middle, __last, __buffer);
+ std::__merge_backward(__first, __middle, __buffer, __buffer_end,
+ __last, __comp);
+ }
+ else
+ {
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last, *__first_cut,
+ __comp);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle, *__second_cut,
+ __comp);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ _BidirectionalIterator __new_middle =
+ std::__rotate_adaptive(__first_cut, __middle, __second_cut,
+ __len1 - __len11, __len22, __buffer,
+ __buffer_size);
+ std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
+ __len22, __buffer, __buffer_size, __comp);
+ std::__merge_adaptive(__new_middle, __second_cut, __last,
+ __len1 - __len11,
+ __len2 - __len22, __buffer,
+ __buffer_size, __comp);
+ }
+ }
+
+ /**
+ * @brief Merges two sorted ranges in place.
+ * @param first An iterator.
+ * @param middle Another iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Merges two sorted and consecutive ranges, [first,middle) and
+ * [middle,last), and puts the result in [first,last). The output will
+ * be sorted. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ *
+ * If enough additional memory is available, this takes (last-first)-1
+ * comparisons. Otherwise an NlogN algorithm is used, where N is
+ * distance(first,last).
+ */
+ template<typename _BidirectionalIterator>
+ void
+ inplace_merge(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last)
+ {
+ typedef typename iterator_traits<_BidirectionalIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_BidirectionalIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_sorted(__first, __middle);
+ __glibcxx_requires_sorted(__middle, __last);
+
+ if (__first == __middle || __middle == __last)
+ return;
+
+ _DistanceType __len1 = std::distance(__first, __middle);
+ _DistanceType __len2 = std::distance(__middle, __last);
+
+ _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__merge_without_buffer(__first, __middle, __last, __len1, __len2);
+ else
+ std::__merge_adaptive(__first, __middle, __last, __len1, __len2,
+ __buf.begin(), _DistanceType(__buf.size()));
+ }
+
+ /**
+ * @brief Merges two sorted ranges in place.
+ * @param first An iterator.
+ * @param middle Another iterator.
+ * @param last Another iterator.
+ * @param comp A functor to use for comparisons.
+ * @return Nothing.
+ *
+ * Merges two sorted and consecutive ranges, [first,middle) and
+ * [middle,last), and puts the result in [first,last). The output will
+ * be sorted. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ *
+ * If enough additional memory is available, this takes (last-first)-1
+ * comparisons. Otherwise an NlogN algorithm is used, where N is
+ * distance(first,last).
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
+ */
+ template<typename _BidirectionalIterator, typename _Compare>
+ void
+ inplace_merge(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_BidirectionalIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_BidirectionalIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _ValueType>)
+ __glibcxx_requires_sorted_pred(__first, __middle, __comp);
+ __glibcxx_requires_sorted_pred(__middle, __last, __comp);
+
+ if (__first == __middle || __middle == __last)
+ return;
+
+ const _DistanceType __len1 = std::distance(__first, __middle);
+ const _DistanceType __len2 = std::distance(__middle, __last);
+
+ _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__merge_without_buffer(__first, __middle, __last, __len1,
+ __len2, __comp);
+ else
+ std::__merge_adaptive(__first, __middle, __last, __len1, __len2,
+ __buf.begin(), _DistanceType(__buf.size()),
+ __comp);
+ }
+
+ template<typename _RandomAccessIterator, typename _Pointer,
+ typename _Distance>
+ void
+ __stable_sort_adaptive(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Distance __buffer_size)
+ {
+ const _Distance __len = (__last - __first + 1) / 2;
+ const _RandomAccessIterator __middle = __first + __len;
+ if (__len > __buffer_size)
+ {
+ std::__stable_sort_adaptive(__first, __middle,
+ __buffer, __buffer_size);
+ std::__stable_sort_adaptive(__middle, __last,
+ __buffer, __buffer_size);
+ }
+ else
+ {
+ std::__merge_sort_with_buffer(__first, __middle, __buffer);
+ std::__merge_sort_with_buffer(__middle, __last, __buffer);
+ }
+ std::__merge_adaptive(__first, __middle, __last,
+ _Distance(__middle - __first),
+ _Distance(__last - __middle),
+ __buffer, __buffer_size);
+ }
+
+ template<typename _RandomAccessIterator, typename _Pointer,
+ typename _Distance, typename _Compare>
+ void
+ __stable_sort_adaptive(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Distance __buffer_size,
+ _Compare __comp)
+ {
+ const _Distance __len = (__last - __first + 1) / 2;
+ const _RandomAccessIterator __middle = __first + __len;
+ if (__len > __buffer_size)
+ {
+ std::__stable_sort_adaptive(__first, __middle, __buffer,
+ __buffer_size, __comp);
+ std::__stable_sort_adaptive(__middle, __last, __buffer,
+ __buffer_size, __comp);
+ }
+ else
+ {
+ std::__merge_sort_with_buffer(__first, __middle, __buffer, __comp);
+ std::__merge_sort_with_buffer(__middle, __last, __buffer, __comp);
+ }
+ std::__merge_adaptive(__first, __middle, __last,
+ _Distance(__middle - __first),
+ _Distance(__last - __middle),
+ __buffer, __buffer_size,
+ __comp);
+ }
+
+ /**
+ * @brief Sort the elements of a sequence, preserving the relative order
+ * of equivalent elements.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p *(i+1)<*i is false for each iterator @p i in the range
+ * @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is preserved, so any two
+ * elements @p x and @p y in the range @p [first,last) such that
+ * @p x<y is false and @p y<x is false will have the same relative
+ * ordering after calling @p stable_sort().
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__inplace_stable_sort(__first, __last);
+ else
+ std::__stable_sort_adaptive(__first, __last, __buf.begin(),
+ _DistanceType(__buf.size()));
+ }
+
+ /**
+ * @brief Sort the elements of a sequence using a predicate for comparison,
+ * preserving the relative order of equivalent elements.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
+ *
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p comp(*(i+1),*i) is false for each iterator @p i in the
+ * range @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is preserved, so any two
+ * elements @p x and @p y in the range @p [first,last) such that
+ * @p comp(x,y) is false and @p comp(y,x) is false will have the same
+ * relative ordering after calling @p stable_sort().
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType,
+ _ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__inplace_stable_sort(__first, __last, __comp);
+ else
+ std::__stable_sort_adaptive(__first, __last, __buf.begin(),
+ _DistanceType(__buf.size()), __comp);
+ }
+
+
+ template<typename _RandomAccessIterator, typename _Size>
+ void
+ __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last, _Size __depth_limit)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ while (__last - __first > 3)
+ {
+ if (__depth_limit == 0)
+ {
+ std::__heap_select(__first, __nth + 1, __last);
+ // Place the nth largest element in its final position.
+ std::iter_swap(__first, __nth);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition(__first, __last,
+ _ValueType(std::__median(*__first,
+ *(__first
+ + (__last
+ - __first)
+ / 2),
+ *(__last
+ - 1))));
+ if (__cut <= __nth)
+ __first = __cut;
+ else
+ __last = __cut;
+ }
+ std::__insertion_sort(__first, __last);
+ }
+
+ template<typename _RandomAccessIterator, typename _Size, typename _Compare>
+ void
+ __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last, _Size __depth_limit,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ while (__last - __first > 3)
+ {
+ if (__depth_limit == 0)
+ {
+ std::__heap_select(__first, __nth + 1, __last, __comp);
+ // Place the nth largest element in its final position.
+ std::iter_swap(__first, __nth);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition(__first, __last,
+ _ValueType(std::__median(*__first,
+ *(__first
+ + (__last
+ - __first)
+ / 2),
+ *(__last - 1),
+ __comp)),
+ __comp);
+ if (__cut <= __nth)
+ __first = __cut;
+ else
+ __last = __cut;
+ }
+ std::__insertion_sort(__first, __last, __comp);
+ }
+
+ /**
+ * @brief Sort a sequence just enough to find a particular position.
+ * @param first An iterator.
+ * @param nth Another iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Rearranges the elements in the range @p [first,last) so that @p *nth
+ * is the same element that would have been in that position had the
+ * whole sequence been sorted.
+ * whole sequence been sorted. The elements either side of @p *nth are
+ * not completely sorted, but for any iterator @i in the range
+ * @p [first,nth) and any iterator @j in the range @p [nth,last) it
+ * holds that @p *j<*i is false.
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __nth);
+ __glibcxx_requires_valid_range(__nth, __last);
+
+ if (__first == __last || __nth == __last)
+ return;
+
+ std::__introselect(__first, __nth, __last,
+ std::__lg(__last - __first) * 2);
+ }
+
+ /**
+ * @brief Sort a sequence just enough to find a particular position
+ * using a predicate for comparison.
+ * @param first An iterator.
+ * @param nth Another iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
+ *
+ * Rearranges the elements in the range @p [first,last) so that @p *nth
+ * is the same element that would have been in that position had the
+ * whole sequence been sorted. The elements either side of @p *nth are
+ * not completely sorted, but for any iterator @i in the range
+ * @p [first,nth) and any iterator @j in the range @p [nth,last) it
+ * holds that @p comp(*j,*i) is false.
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _ValueType>)
+ __glibcxx_requires_valid_range(__first, __nth);
+ __glibcxx_requires_valid_range(__nth, __last);
+
+ if (__first == __last || __nth == __last)
+ return;
+
+ std::__introselect(__first, __nth, __last,
+ std::__lg(__last - __first) * 2, __comp);
+ }
+
+ /**
+ * @brief Finds the largest subrange in which @a val could be inserted
+ * at any place in it without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @return An pair of iterators defining the subrange.
+ * @ingroup binarysearch
+ *
+ * This is equivalent to
+ * @code
+ * std::make_pair(lower_bound(first, last, val),
+ * upper_bound(first, last, val))
+ * @endcode
+ * but does not actually call those functions.
+ */
+ template<typename _ForwardIterator, typename _Tp>
+ pair<_ForwardIterator, _ForwardIterator>
+ equal_range(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>)
+ __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
+ __glibcxx_requires_partitioned(__first, __last, __val);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle, __left, __right;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (*__middle < __val)
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ else if (__val < *__middle)
+ __len = __half;
+ else
+ {
+ __left = std::lower_bound(__first, __middle, __val);
+ std::advance(__first, __len);
+ __right = std::upper_bound(++__middle, __first, __val);
+ return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
+ }
+ }
+ return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
+ }
+
+ /**
+ * @brief Finds the largest subrange in which @a val could be inserted
+ * at any place in it without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @param comp A functor to use for comparisons.
+ * @return An pair of iterators defining the subrange.
+ * @ingroup binarysearch
+ *
+ * This is equivalent to
+ * @code
+ * std::make_pair(lower_bound(first, last, val, comp),
+ * upper_bound(first, last, val, comp))
+ * @endcode
+ * but does not actually call those functions.
+ */
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ pair<_ForwardIterator, _ForwardIterator>
+ equal_range(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _Tp>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _Tp, _ValueType>)
+ __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle, __left, __right;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__comp(*__middle, __val))
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ else if (__comp(__val, *__middle))
+ __len = __half;
+ else
+ {
+ __left = std::lower_bound(__first, __middle, __val, __comp);
+ std::advance(__first, __len);
+ __right = std::upper_bound(++__middle, __first, __val, __comp);
+ return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
+ }
+ }
+ return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
+ }
+
+ /**
+ * @brief Determines whether an element exists in a range.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @return True if @a val (or its equivelent) is in [@a first,@a last ].
+ * @ingroup binarysearch
+ *
+ * Note that this does not actually return an iterator to @a val. For
+ * that, use std::find or a container's specialized find member functions.
+ */
+ template<typename _ForwardIterator, typename _Tp>
+ bool
+ binary_search(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
+ __glibcxx_requires_partitioned(__first, __last, __val);
+
+ _ForwardIterator __i = std::lower_bound(__first, __last, __val);
+ return __i != __last && !(__val < *__i);
+ }
+
+ /**
+ * @brief Determines whether an element exists in a range.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @param comp A functor to use for comparisons.
+ * @return True if @a val (or its equivelent) is in [@a first,@a last ].
+ * @ingroup binarysearch
+ *
+ * Note that this does not actually return an iterator to @a val. For
+ * that, use std::find or a container's specialized find member functions.
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
+ */
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ bool
+ binary_search(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val, _Compare __comp)
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _Tp, _ValueType>)
+ __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+
+ _ForwardIterator __i = std::lower_bound(__first, __last, __val, __comp);
+ return __i != __last && !__comp(__val, *__i);
+ }
+
+ // Set algorithms: includes, set_union, set_intersection, set_difference,
+ // set_symmetric_difference. All of these algorithms have the precondition
+ // that their input ranges are sorted and the postcondition that their output
+ // ranges are sorted.
+
+ /**
+ * @brief Determines whether all elements of a sequence exists in a range.
+ * @param first1 Start of search range.
+ * @param last1 End of search range.
+ * @param first2 Start of sequence
+ * @param last2 End of sequence.
+ * @return True if each element in [first2,last2) is contained in order
+ * within [first1,last1). False otherwise.
+ * @ingroup setoperations
+ *
+ * This operation expects both [first1,last1) and [first2,last2) to be
+ * sorted. Searches for the presence of each element in [first2,last2)
+ * within [first1,last1). The iterators over each range only move forward,
+ * so this is a linear algorithm. If an element in [first2,last2) is not
+ * found before the search iterator reaches @a last2, false is returned.
+ */
+ template<typename _InputIterator1, typename _InputIterator2>
+ bool
+ includes(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted(__first1, __last1);
+ __glibcxx_requires_sorted(__first2, __last2);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (*__first2 < *__first1)
+ return false;
+ else if(*__first1 < *__first2)
+ ++__first1;
+ else
+ ++__first1, ++__first2;
+
+ return __first2 == __last2;
+ }
+
+ /**
+ * @brief Determines whether all elements of a sequence exists in a range
+ * using comparison.
+ * @param first1 Start of search range.
+ * @param last1 End of search range.
+ * @param first2 Start of sequence
+ * @param last2 End of sequence.
+ * @param comp Comparison function to use.
+ * @return True if each element in [first2,last2) is contained in order
+ * within [first1,last1) according to comp. False otherwise.
+ * @ingroup setoperations
+ *
+ * This operation expects both [first1,last1) and [first2,last2) to be
+ * sorted. Searches for the presence of each element in [first2,last2)
+ * within [first1,last1), using comp to decide. The iterators over each
+ * range only move forward, so this is a linear algorithm. If an element
+ * in [first2,last2) is not found before the search iterator reaches @a
+ * last2, false is returned.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _Compare>
+ bool
+ includes(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
+ __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (__comp(*__first2, *__first1))
+ return false;
+ else if(__comp(*__first1, *__first2))
+ ++__first1;
+ else
+ ++__first1, ++__first2;
+
+ return __first2 == __last2;
+ }
+
+ /**
+ * @brief Return the union of two sorted ranges.
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @return End of the output range.
+ * @ingroup setoperations
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * each range in order to the output range. Iterators increment for each
+ * range. When the current element of one range is less than the other,
+ * that element is copied and the iterator advanced. If an element is
+ * contained in both ranges, the element from the first range is copied and
+ * both ranges advance. The output range may not overlap either input
+ * range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ set_union(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted(__first1, __last1);
+ __glibcxx_requires_sorted(__first2, __last2);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ {
+ if (*__first1 < *__first2)
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ else if (*__first2 < *__first1)
+ {
+ *__result = *__first2;
+ ++__first2;
+ }
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__first2;
+ }
+ ++__result;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
+ }
+
+ /**
+ * @brief Return the union of two sorted ranges using a comparison functor.
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @param comp The comparison functor.
+ * @return End of the output range.
+ * @ingroup setoperations
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * each range in order to the output range. Iterators increment for each
+ * range. When the current element of one range is less than the other
+ * according to @a comp, that element is copied and the iterator advanced.
+ * If an equivalent element according to @a comp is contained in both
+ * ranges, the element from the first range is copied and both ranges
+ * advance. The output range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ set_union(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result, _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
+ __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ {
+ if (__comp(*__first1, *__first2))
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ else if (__comp(*__first2, *__first1))
+ {
+ *__result = *__first2;
+ ++__first2;
+ }
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__first2;
+ }
+ ++__result;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
+ }
+
+ /**
+ * @brief Return the intersection of two sorted ranges.
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @return End of the output range.
+ * @ingroup setoperations
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * both ranges in order to the output range. Iterators increment for each
+ * range. When the current element of one range is less than the other,
+ * that iterator advances. If an element is contained in both ranges, the
+ * element from the first range is copied and both ranges advance. The
+ * output range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted(__first1, __last1);
+ __glibcxx_requires_sorted(__first2, __last2);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (*__first1 < *__first2)
+ ++__first1;
+ else if (*__first2 < *__first1)
+ ++__first2;
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__first2;
+ ++__result;
+ }
+ return __result;
+ }
+
+ /**
+ * @brief Return the intersection of two sorted ranges using comparison
+ * functor.
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @param comp The comparison functor.
+ * @return End of the output range.
+ * @ingroup setoperations
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * both ranges in order to the output range. Iterators increment for each
+ * range. When the current element of one range is less than the other
+ * according to @a comp, that iterator advances. If an element is
+ * contained in both ranges according to @a comp, the element from the
+ * first range is copied and both ranges advance. The output range may not
+ * overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result, _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
+ __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (__comp(*__first1, *__first2))
+ ++__first1;
+ else if (__comp(*__first2, *__first1))
+ ++__first2;
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__first2;
+ ++__result;
+ }
+ return __result;
+ }
+
+ /**
+ * @brief Return the difference of two sorted ranges.
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @return End of the output range.
+ * @ingroup setoperations
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * the first range but not the second in order to the output range.
+ * Iterators increment for each range. When the current element of the
+ * first range is less than the second, that element is copied and the
+ * iterator advances. If the current element of the second range is less,
+ * the iterator advances, but no element is copied. If an element is
+ * contained in both ranges, no elements are copied and both ranges
+ * advance. The output range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted(__first1, __last1);
+ __glibcxx_requires_sorted(__first2, __last2);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (*__first1 < *__first2)
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__result;
+ }
+ else if (*__first2 < *__first1)
+ ++__first2;
+ else
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return std::copy(__first1, __last1, __result);
+ }
+
+ /**
+ * @brief Return the difference of two sorted ranges using comparison
+ * functor.
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @param comp The comparison functor.
+ * @return End of the output range.
+ * @ingroup setoperations
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * the first range but not the second in order to the output range.
+ * Iterators increment for each range. When the current element of the
+ * first range is less than the second according to @a comp, that element
+ * is copied and the iterator advances. If the current element of the
+ * second range is less, no element is copied and the iterator advances.
+ * If an element is contained in both ranges according to @a comp, no
+ * elements are copied and both ranges advance. The output range may not
+ * overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result, _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
+ __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (__comp(*__first1, *__first2))
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__result;
+ }
+ else if (__comp(*__first2, *__first1))
+ ++__first2;
+ else
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return std::copy(__first1, __last1, __result);
+ }
+
+ /**
+ * @brief Return the symmetric difference of two sorted ranges.
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @return End of the output range.
+ * @ingroup setoperations
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * one range but not the other in order to the output range. Iterators
+ * increment for each range. When the current element of one range is less
+ * than the other, that element is copied and the iterator advances. If an
+ * element is contained in both ranges, no elements are copied and both
+ * ranges advance. The output range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted(__first1, __last1);
+ __glibcxx_requires_sorted(__first2, __last2);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (*__first1 < *__first2)
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__result;
+ }
+ else if (*__first2 < *__first1)
+ {
+ *__result = *__first2;
+ ++__first2;
+ ++__result;
+ }
+ else
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1,
+ __last1, __result));
+ }
+
+ /**
+ * @brief Return the symmetric difference of two sorted ranges using
+ * comparison functor.
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @param comp The comparison functor.
+ * @return End of the output range.
+ * @ingroup setoperations
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * one range but not the other in order to the output range. Iterators
+ * increment for each range. When the current element of one range is less
+ * than the other according to @a comp, that element is copied and the
+ * iterator advances. If an element is contained in both ranges according
+ * to @a comp, no elements are copied and both ranges advance. The output
+ * range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
+ __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (__comp(*__first1, *__first2))
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__result;
+ }
+ else if (__comp(*__first2, *__first1))
+ {
+ *__result = *__first2;
+ ++__first2;
+ ++__result;
+ }
+ else
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1,
+ __last1, __result));
+ }
+
+ // min_element and max_element, with and without an explicitly supplied
+ // comparison function.
+
+ /**
+ * @brief Return the maximum element in a range.
+ * @param first Start of range.
+ * @param last End of range.
+ * @return Iterator referencing the first instance of the largest value.
+ */
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ max_element(_ForwardIterator __first, _ForwardIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (*__result < *__first)
+ __result = __first;
+ return __result;
+ }
+
+ /**
+ * @brief Return the maximum element in a range using comparison functor.
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp Comparison functor.
+ * @return Iterator referencing the first instance of the largest value
+ * according to comp.
+ */
+ template<typename _ForwardIterator, typename _Compare>
+ _ForwardIterator
+ max_element(_ForwardIterator __first, _ForwardIterator __last,
+ _Compare __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last) return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (__comp(*__result, *__first)) __result = __first;
+ return __result;
+ }
+
+ /**
+ * @brief Return the minimum element in a range.
+ * @param first Start of range.
+ * @param last End of range.
+ * @return Iterator referencing the first instance of the smallest value.
+ */
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ min_element(_ForwardIterator __first, _ForwardIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (*__first < *__result)
+ __result = __first;
+ return __result;
+ }
+
+ /**
+ * @brief Return the minimum element in a range using comparison functor.
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp Comparison functor.
+ * @return Iterator referencing the first instance of the smallest value
+ * according to comp.
+ */
+ template<typename _ForwardIterator, typename _Compare>
+ _ForwardIterator
+ min_element(_ForwardIterator __first, _ForwardIterator __last,
+ _Compare __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (__comp(*__first, *__result))
+ __result = __first;
+ return __result;
+ }
+
+ // next_permutation and prev_permutation, with and without an explicitly
+ // supplied comparison function.
+
+ /**
+ * @brief Permute range into the next "dictionary" ordering.
+ * @param first Start of range.
+ * @param last End of range.
+ * @return False if wrapped to first permutation, true otherwise.
+ *
+ * Treats all permutations of the range as a set of "dictionary" sorted
+ * sequences. Permutes the current sequence into the next one of this set.
+ * Returns true if there are more sequences to generate. If the sequence
+ * is the largest of the set, the smallest is generated and false returned.
+ */
+ template<typename _BidirectionalIterator>
+ bool
+ next_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (*__i < *__ii)
+ {
+ _BidirectionalIterator __j = __last;
+ while (!(*__i < *--__j))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
+ }
+ }
+
+ /**
+ * @brief Permute range into the next "dictionary" ordering using
+ * comparison functor.
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp
+ * @return False if wrapped to first permutation, true otherwise.
+ *
+ * Treats all permutations of the range [first,last) as a set of
+ * "dictionary" sorted sequences ordered by @a comp. Permutes the current
+ * sequence into the next one of this set. Returns true if there are more
+ * sequences to generate. If the sequence is the largest of the set, the
+ * smallest is generated and false returned.
+ */
+ template<typename _BidirectionalIterator, typename _Compare>
+ bool
+ next_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last, _Compare __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ typename iterator_traits<_BidirectionalIterator>::value_type,
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (__comp(*__i, *__ii))
+ {
+ _BidirectionalIterator __j = __last;
+ while (!__comp(*__i, *--__j))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
+ }
+ }
+
+ /**
+ * @brief Permute range into the previous "dictionary" ordering.
+ * @param first Start of range.
+ * @param last End of range.
+ * @return False if wrapped to last permutation, true otherwise.
+ *
+ * Treats all permutations of the range as a set of "dictionary" sorted
+ * sequences. Permutes the current sequence into the previous one of this
+ * set. Returns true if there are more sequences to generate. If the
+ * sequence is the smallest of the set, the largest is generated and false
+ * returned.
+ */
+ template<typename _BidirectionalIterator>
+ bool
+ prev_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (*__ii < *__i)
+ {
+ _BidirectionalIterator __j = __last;
+ while (!(*--__j < *__i))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
+ }
+ }
+
+ /**
+ * @brief Permute range into the previous "dictionary" ordering using
+ * comparison functor.
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp
+ * @return False if wrapped to last permutation, true otherwise.
+ *
+ * Treats all permutations of the range [first,last) as a set of
+ * "dictionary" sorted sequences ordered by @a comp. Permutes the current
+ * sequence into the previous one of this set. Returns true if there are
+ * more sequences to generate. If the sequence is the smallest of the set,
+ * the largest is generated and false returned.
+ */
+ template<typename _BidirectionalIterator, typename _Compare>
+ bool
+ prev_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last, _Compare __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ typename iterator_traits<_BidirectionalIterator>::value_type,
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (__comp(*__ii, *__i))
+ {
+ _BidirectionalIterator __j = __last;
+ while (!__comp(*--__j, *__i))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
+ }
+ }
+
+ // find_first_of, with and without an explicitly supplied comparison function.
+
+ /**
+ * @brief Find element from a set in a sequence.
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of match candidates.
+ * @param last2 End of match candidates.
+ * @return The first iterator @c i in the range
+ * @p [first1,last1) such that @c *i == @p *(i2) such that i2 is an
+ * interator in [first2,last2), or @p last1 if no such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for an element that is equal to
+ * some element in the range [first2,last2). If found, returns an iterator
+ * in the range [first1,last1), otherwise returns @p last1.
+ */
+ template<typename _InputIterator, typename _ForwardIterator>
+ _InputIterator
+ find_first_of(_InputIterator __first1, _InputIterator __last1,
+ _ForwardIterator __first2, _ForwardIterator __last2)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+
+ for ( ; __first1 != __last1; ++__first1)
+ for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter)
+ if (*__first1 == *__iter)
+ return __first1;
+ return __last1;
+ }
+
+ /**
+ * @brief Find element from a set in a sequence using a predicate.
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of match candidates.
+ * @param last2 End of match candidates.
+ * @param comp Predicate to use.
+ * @return The first iterator @c i in the range
+ * @p [first1,last1) such that @c comp(*i, @p *(i2)) is true and i2 is an
+ * interator in [first2,last2), or @p last1 if no such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for an element that is equal to
+ * some element in the range [first2,last2). If found, returns an iterator in
+ * the range [first1,last1), otherwise returns @p last1.
+ */
+ template<typename _InputIterator, typename _ForwardIterator,
+ typename _BinaryPredicate>
+ _InputIterator
+ find_first_of(_InputIterator __first1, _InputIterator __last1,
+ _ForwardIterator __first2, _ForwardIterator __last2,
+ _BinaryPredicate __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_InputIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+
+ for ( ; __first1 != __last1; ++__first1)
+ for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter)
+ if (__comp(*__first1, *__iter))
+ return __first1;
+ return __last1;
+ }
+
+
+ // find_end, with and without an explicitly supplied comparison function.
+ // Search [first2, last2) as a subsequence in [first1, last1), and return
+ // the *last* possible match. Note that find_end for bidirectional iterators
+ // is much faster than for forward iterators.
+
+ // find_end for forward iterators.
+ template<typename _ForwardIterator1, typename _ForwardIterator2>
+ _ForwardIterator1
+ __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ forward_iterator_tag, forward_iterator_tag)
+ {
+ if (__first2 == __last2)
+ return __last1;
+ else
+ {
+ _ForwardIterator1 __result = __last1;
+ while (1)
+ {
+ _ForwardIterator1 __new_result
+ = std::search(__first1, __last1, __first2, __last2);
+ if (__new_result == __last1)
+ return __result;
+ else
+ {
+ __result = __new_result;
+ __first1 = __new_result;
+ ++__first1;
+ }
+ }
+ }
+ }
+
+ template<typename _ForwardIterator1, typename _ForwardIterator2,
+ typename _BinaryPredicate>
+ _ForwardIterator1
+ __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ forward_iterator_tag, forward_iterator_tag,
+ _BinaryPredicate __comp)
+ {
+ if (__first2 == __last2)
+ return __last1;
+ else
+ {
+ _ForwardIterator1 __result = __last1;
+ while (1)
+ {
+ _ForwardIterator1 __new_result
+ = std::search(__first1, __last1, __first2, __last2, __comp);
+ if (__new_result == __last1)
+ return __result;
+ else
+ {
+ __result = __new_result;
+ __first1 = __new_result;
+ ++__first1;
+ }
+ }
+ }
+ }
+
+ // find_end for bidirectional iterators. Requires partial specialization.
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2>
+ _BidirectionalIterator1
+ __find_end(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ bidirectional_iterator_tag, bidirectional_iterator_tag)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator1>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator2>)
+
+ typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
+ typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
+
+ _RevIterator1 __rlast1(__first1);
+ _RevIterator2 __rlast2(__first2);
+ _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1,
+ _RevIterator2(__last2), __rlast2);
+
+ if (__rresult == __rlast1)
+ return __last1;
+ else
+ {
+ _BidirectionalIterator1 __result = __rresult.base();
+ std::advance(__result, -std::distance(__first2, __last2));
+ return __result;
+ }
+ }
+
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
+ typename _BinaryPredicate>
+ _BidirectionalIterator1
+ __find_end(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ bidirectional_iterator_tag, bidirectional_iterator_tag,
+ _BinaryPredicate __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator1>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator2>)
+
+ typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
+ typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
+
+ _RevIterator1 __rlast1(__first1);
+ _RevIterator2 __rlast2(__first2);
+ _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1,
+ _RevIterator2(__last2), __rlast2,
+ __comp);
+
+ if (__rresult == __rlast1)
+ return __last1;
+ else
+ {
+ _BidirectionalIterator1 __result = __rresult.base();
+ std::advance(__result, -std::distance(__first2, __last2));
+ return __result;
+ }
+ }
+
+ // Dispatching functions for find_end.
+
+ /**
+ * @brief Find last matching subsequence in a sequence.
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of sequence to match.
+ * @param last2 End of sequence to match.
+ * @return The last iterator @c i in the range
+ * @p [first1,last1-(last2-first2)) such that @c *(i+N) == @p *(first2+N)
+ * for each @c N in the range @p [0,last2-first2), or @p last1 if no
+ * such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for a sub-sequence that compares
+ * equal value-by-value with the sequence given by @p [first2,last2) and
+ * returns an iterator to the first element of the sub-sequence, or
+ * @p last1 if the sub-sequence is not found. The sub-sequence will be the
+ * last such subsequence contained in [first,last1).
+ *
+ * Because the sub-sequence must lie completely within the range
+ * @p [first1,last1) it must start at a position less than
+ * @p last1-(last2-first2) where @p last2-first2 is the length of the
+ * sub-sequence.
+ * This means that the returned iterator @c i will be in the range
+ * @p [first1,last1-(last2-first2))
+ */
+ template<typename _ForwardIterator1, typename _ForwardIterator2>
+ inline _ForwardIterator1
+ find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_ForwardIterator1>::value_type,
+ typename iterator_traits<_ForwardIterator2>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+
+ return std::__find_end(__first1, __last1, __first2, __last2,
+ std::__iterator_category(__first1),
+ std::__iterator_category(__first2));
+ }
+
+ /**
+ * @brief Find last matching subsequence in a sequence using a predicate.
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of sequence to match.
+ * @param last2 End of sequence to match.
+ * @param comp The predicate to use.
+ * @return The last iterator @c i in the range
+ * @p [first1,last1-(last2-first2)) such that @c predicate(*(i+N), @p
+ * (first2+N)) is true for each @c N in the range @p [0,last2-first2), or
+ * @p last1 if no such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for a sub-sequence that compares
+ * equal value-by-value with the sequence given by @p [first2,last2) using
+ * comp as a predicate and returns an iterator to the first element of the
+ * sub-sequence, or @p last1 if the sub-sequence is not found. The
+ * sub-sequence will be the last such subsequence contained in
+ * [first,last1).
+ *
+ * Because the sub-sequence must lie completely within the range
+ * @p [first1,last1) it must start at a position less than
+ * @p last1-(last2-first2) where @p last2-first2 is the length of the
+ * sub-sequence.
+ * This means that the returned iterator @c i will be in the range
+ * @p [first1,last1-(last2-first2))
+ */
+ template<typename _ForwardIterator1, typename _ForwardIterator2,
+ typename _BinaryPredicate>
+ inline _ForwardIterator1
+ find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ _BinaryPredicate __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator1>::value_type,
+ typename iterator_traits<_ForwardIterator2>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+
+ return std::__find_end(__first1, __last1, __first2, __last2,
+ std::__iterator_category(__first1),
+ std::__iterator_category(__first2),
+ __comp);
+ }
+
+_GLIBCXX_END_NAMESPACE
+
+#endif /* _ALGO_H */
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