LCOV - code coverage report
Current view: top level - usr/include/c++/4.9/bits - stl_algobase.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 25 54 46.3 %
Date: 2016-12-01 18:45:36 Functions: 14 157 8.9 %

          Line data    Source code
       1             : // Core algorithmic facilities -*- C++ -*-
       2             : 
       3             : // Copyright (C) 2001-2014 Free Software Foundation, Inc.
       4             : //
       5             : // This file is part of the GNU ISO C++ Library.  This library is free
       6             : // software; you can redistribute it and/or modify it under the
       7             : // terms of the GNU General Public License as published by the
       8             : // Free Software Foundation; either version 3, or (at your option)
       9             : // any later version.
      10             : 
      11             : // This library is distributed in the hope that it will be useful,
      12             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             : // GNU General Public License for more details.
      15             : 
      16             : // Under Section 7 of GPL version 3, you are granted additional
      17             : // permissions described in the GCC Runtime Library Exception, version
      18             : // 3.1, as published by the Free Software Foundation.
      19             : 
      20             : // You should have received a copy of the GNU General Public License and
      21             : // a copy of the GCC Runtime Library Exception along with this program;
      22             : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23             : // <http://www.gnu.org/licenses/>.
      24             : 
      25             : /*
      26             :  *
      27             :  * Copyright (c) 1994
      28             :  * Hewlett-Packard Company
      29             :  *
      30             :  * Permission to use, copy, modify, distribute and sell this software
      31             :  * and its documentation for any purpose is hereby granted without fee,
      32             :  * provided that the above copyright notice appear in all copies and
      33             :  * that both that copyright notice and this permission notice appear
      34             :  * in supporting documentation.  Hewlett-Packard Company makes no
      35             :  * representations about the suitability of this software for any
      36             :  * purpose.  It is provided "as is" without express or implied warranty.
      37             :  *
      38             :  *
      39             :  * Copyright (c) 1996-1998
      40             :  * Silicon Graphics Computer Systems, Inc.
      41             :  *
      42             :  * Permission to use, copy, modify, distribute and sell this software
      43             :  * and its documentation for any purpose is hereby granted without fee,
      44             :  * provided that the above copyright notice appear in all copies and
      45             :  * that both that copyright notice and this permission notice appear
      46             :  * in supporting documentation.  Silicon Graphics makes no
      47             :  * representations about the suitability of this software for any
      48             :  * purpose.  It is provided "as is" without express or implied warranty.
      49             :  */
      50             : 
      51             : /** @file bits/stl_algobase.h
      52             :  *  This is an internal header file, included by other library headers.
      53             :  *  Do not attempt to use it directly. @headername{algorithm}
      54             :  */
      55             : 
      56             : #ifndef _STL_ALGOBASE_H
      57             : #define _STL_ALGOBASE_H 1
      58             : 
      59             : #include <bits/c++config.h>
      60             : #include <bits/functexcept.h>
      61             : #include <bits/cpp_type_traits.h>
      62             : #include <ext/type_traits.h>
      63             : #include <ext/numeric_traits.h>
      64             : #include <bits/stl_pair.h>
      65             : #include <bits/stl_iterator_base_types.h>
      66             : #include <bits/stl_iterator_base_funcs.h>
      67             : #include <bits/stl_iterator.h>
      68             : #include <bits/concept_check.h>
      69             : #include <debug/debug.h>
      70             : #include <bits/move.h> // For std::swap and _GLIBCXX_MOVE
      71             : #include <bits/predefined_ops.h>
      72             : 
      73             : namespace std _GLIBCXX_VISIBILITY(default)
      74             : {
      75             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      76             : 
      77             : #if __cplusplus < 201103L
      78             :   // See http://gcc.gnu.org/ml/libstdc++/2004-08/msg00167.html: in a
      79             :   // nutshell, we are partially implementing the resolution of DR 187,
      80             :   // when it's safe, i.e., the value_types are equal.
      81             :   template<bool _BoolType>
      82             :     struct __iter_swap
      83             :     {
      84             :       template<typename _ForwardIterator1, typename _ForwardIterator2>
      85             :         static void
      86             :         iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
      87             :         {
      88             :           typedef typename iterator_traits<_ForwardIterator1>::value_type
      89             :             _ValueType1;
      90             :           _ValueType1 __tmp = _GLIBCXX_MOVE(*__a);
      91             :           *__a = _GLIBCXX_MOVE(*__b);
      92             :           *__b = _GLIBCXX_MOVE(__tmp);
      93             :         }
      94             :     };
      95             : 
      96             :   template<>
      97             :     struct __iter_swap<true>
      98             :     {
      99             :       template<typename _ForwardIterator1, typename _ForwardIterator2>
     100             :         static void 
     101             :         iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
     102             :         {
     103             :           swap(*__a, *__b);
     104             :         }
     105             :     };
     106             : #endif
     107             : 
     108             :   /**
     109             :    *  @brief Swaps the contents of two iterators.
     110             :    *  @ingroup mutating_algorithms
     111             :    *  @param  __a  An iterator.
     112             :    *  @param  __b  Another iterator.
     113             :    *  @return   Nothing.
     114             :    *
     115             :    *  This function swaps the values pointed to by two iterators, not the
     116             :    *  iterators themselves.
     117             :   */
     118             :   template<typename _ForwardIterator1, typename _ForwardIterator2>
     119             :     inline void
     120           0 :     iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
     121             :     {
     122             :       // concept requirements
     123             :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
     124             :                                   _ForwardIterator1>)
     125             :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
     126             :                                   _ForwardIterator2>)
     127             : 
     128             : #if __cplusplus < 201103L
     129             :       typedef typename iterator_traits<_ForwardIterator1>::value_type
     130             :         _ValueType1;
     131             :       typedef typename iterator_traits<_ForwardIterator2>::value_type
     132             :         _ValueType2;
     133             : 
     134             :       __glibcxx_function_requires(_ConvertibleConcept<_ValueType1,
     135             :                                   _ValueType2>)
     136             :       __glibcxx_function_requires(_ConvertibleConcept<_ValueType2,
     137             :                                   _ValueType1>)
     138             : 
     139             :       typedef typename iterator_traits<_ForwardIterator1>::reference
     140             :         _ReferenceType1;
     141             :       typedef typename iterator_traits<_ForwardIterator2>::reference
     142             :         _ReferenceType2;
     143             :       std::__iter_swap<__are_same<_ValueType1, _ValueType2>::__value
     144             :         && __are_same<_ValueType1&, _ReferenceType1>::__value
     145             :         && __are_same<_ValueType2&, _ReferenceType2>::__value>::
     146             :         iter_swap(__a, __b);
     147             : #else
     148           0 :       swap(*__a, *__b);
     149             : #endif
     150           0 :     }
     151             : 
     152             :   /**
     153             :    *  @brief Swap the elements of two sequences.
     154             :    *  @ingroup mutating_algorithms
     155             :    *  @param  __first1  A forward iterator.
     156             :    *  @param  __last1   A forward iterator.
     157             :    *  @param  __first2  A forward iterator.
     158             :    *  @return   An iterator equal to @p first2+(last1-first1).
     159             :    *
     160             :    *  Swaps each element in the range @p [first1,last1) with the
     161             :    *  corresponding element in the range @p [first2,(last1-first1)).
     162             :    *  The ranges must not overlap.
     163             :   */
     164             :   template<typename _ForwardIterator1, typename _ForwardIterator2>
     165             :     _ForwardIterator2
     166             :     swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
     167             :                 _ForwardIterator2 __first2)
     168             :     {
     169             :       // concept requirements
     170             :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
     171             :                                   _ForwardIterator1>)
     172             :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
     173             :                                   _ForwardIterator2>)
     174             :       __glibcxx_requires_valid_range(__first1, __last1);
     175             : 
     176             :       for (; __first1 != __last1; ++__first1, ++__first2)
     177             :         std::iter_swap(__first1, __first2);
     178             :       return __first2;
     179             :     }
     180             : 
     181             :   /**
     182             :    *  @brief This does what you think it does.
     183             :    *  @ingroup sorting_algorithms
     184             :    *  @param  __a  A thing of arbitrary type.
     185             :    *  @param  __b  Another thing of arbitrary type.
     186             :    *  @return   The lesser of the parameters.
     187             :    *
     188             :    *  This is the simple classic generic implementation.  It will work on
     189             :    *  temporary expressions, since they are only evaluated once, unlike a
     190             :    *  preprocessor macro.
     191             :   */
     192             :   template<typename _Tp>
     193             :     inline const _Tp&
     194           0 :     min(const _Tp& __a, const _Tp& __b)
     195             :     {
     196             :       // concept requirements
     197             :       __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
     198             :       //return __b < __a ? __b : __a;
     199           0 :       if (__b < __a)
     200           0 :         return __b;
     201           0 :       return __a;
     202             :     }
     203             : 
     204             :   /**
     205             :    *  @brief This does what you think it does.
     206             :    *  @ingroup sorting_algorithms
     207             :    *  @param  __a  A thing of arbitrary type.
     208             :    *  @param  __b  Another thing of arbitrary type.
     209             :    *  @return   The greater of the parameters.
     210             :    *
     211             :    *  This is the simple classic generic implementation.  It will work on
     212             :    *  temporary expressions, since they are only evaluated once, unlike a
     213             :    *  preprocessor macro.
     214             :   */
     215             :   template<typename _Tp>
     216             :     inline const _Tp&
     217          81 :     max(const _Tp& __a, const _Tp& __b)
     218             :     {
     219             :       // concept requirements
     220             :       __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
     221             :       //return  __a < __b ? __b : __a;
     222          81 :       if (__a < __b)
     223          67 :         return __b;
     224          14 :       return __a;
     225             :     }
     226             : 
     227             :   /**
     228             :    *  @brief This does what you think it does.
     229             :    *  @ingroup sorting_algorithms
     230             :    *  @param  __a  A thing of arbitrary type.
     231             :    *  @param  __b  Another thing of arbitrary type.
     232             :    *  @param  __comp  A @link comparison_functors comparison functor@endlink.
     233             :    *  @return   The lesser of the parameters.
     234             :    *
     235             :    *  This will work on temporary expressions, since they are only evaluated
     236             :    *  once, unlike a preprocessor macro.
     237             :   */
     238             :   template<typename _Tp, typename _Compare>
     239             :     inline const _Tp&
     240             :     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
     241             :     {
     242             :       //return __comp(__b, __a) ? __b : __a;
     243             :       if (__comp(__b, __a))
     244             :         return __b;
     245             :       return __a;
     246             :     }
     247             : 
     248             :   /**
     249             :    *  @brief This does what you think it does.
     250             :    *  @ingroup sorting_algorithms
     251             :    *  @param  __a  A thing of arbitrary type.
     252             :    *  @param  __b  Another thing of arbitrary type.
     253             :    *  @param  __comp  A @link comparison_functors comparison functor@endlink.
     254             :    *  @return   The greater of the parameters.
     255             :    *
     256             :    *  This will work on temporary expressions, since they are only evaluated
     257             :    *  once, unlike a preprocessor macro.
     258             :   */
     259             :   template<typename _Tp, typename _Compare>
     260             :     inline const _Tp&
     261             :     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
     262             :     {
     263             :       //return __comp(__a, __b) ? __b : __a;
     264             :       if (__comp(__a, __b))
     265             :         return __b;
     266             :       return __a;
     267             :     }
     268             : 
     269             :   // If _Iterator is a __normal_iterator return its base (a plain pointer,
     270             :   // normally) otherwise return it untouched.  See copy, fill, ... 
     271             :   template<typename _Iterator>
     272             :     struct _Niter_base
     273             :     : _Iter_base<_Iterator, __is_normal_iterator<_Iterator>::__value>
     274             :     { };
     275             : 
     276             :   template<typename _Iterator>
     277             :     inline typename _Niter_base<_Iterator>::iterator_type
     278          18 :     __niter_base(_Iterator __it)
     279          18 :     { return std::_Niter_base<_Iterator>::_S_base(__it); }
     280             : 
     281             :   // Likewise, for move_iterator.
     282             :   template<typename _Iterator>
     283             :     struct _Miter_base
     284             :     : _Iter_base<_Iterator, __is_move_iterator<_Iterator>::__value>
     285             :     { };
     286             : 
     287             :   template<typename _Iterator>
     288             :     inline typename _Miter_base<_Iterator>::iterator_type
     289          12 :     __miter_base(_Iterator __it)
     290          12 :     { return std::_Miter_base<_Iterator>::_S_base(__it); }
     291             : 
     292             :   // All of these auxiliary structs serve two purposes.  (1) Replace
     293             :   // calls to copy with memmove whenever possible.  (Memmove, not memcpy,
     294             :   // because the input and output ranges are permitted to overlap.)
     295             :   // (2) If we're using random access iterators, then write the loop as
     296             :   // a for loop with an explicit count.
     297             : 
     298             :   template<bool, bool, typename>
     299             :     struct __copy_move
     300             :     {
     301             :       template<typename _II, typename _OI>
     302             :         static _OI
     303             :         __copy_m(_II __first, _II __last, _OI __result)
     304             :         {
     305             :           for (; __first != __last; ++__result, ++__first)
     306             :             *__result = *__first;
     307             :           return __result;
     308             :         }
     309             :     };
     310             : 
     311             : #if __cplusplus >= 201103L
     312             :   template<typename _Category>
     313             :     struct __copy_move<true, false, _Category>
     314             :     {
     315             :       template<typename _II, typename _OI>
     316             :         static _OI
     317             :         __copy_m(_II __first, _II __last, _OI __result)
     318             :         {
     319             :           for (; __first != __last; ++__result, ++__first)
     320             :             *__result = std::move(*__first);
     321             :           return __result;
     322             :         }
     323             :     };
     324             : #endif
     325             : 
     326             :   template<>
     327             :     struct __copy_move<false, false, random_access_iterator_tag>
     328             :     {
     329             :       template<typename _II, typename _OI>
     330             :         static _OI
     331           5 :         __copy_m(_II __first, _II __last, _OI __result)
     332             :         { 
     333             :           typedef typename iterator_traits<_II>::difference_type _Distance;
     334          10 :           for(_Distance __n = __last - __first; __n > 0; --__n)
     335             :             {
     336           5 :               *__result = *__first;
     337           5 :               ++__first;
     338           5 :               ++__result;
     339             :             }
     340           5 :           return __result;
     341             :         }
     342             :     };
     343             : 
     344             : #if __cplusplus >= 201103L
     345             :   template<>
     346             :     struct __copy_move<true, false, random_access_iterator_tag>
     347             :     {
     348             :       template<typename _II, typename _OI>
     349             :         static _OI
     350           0 :         __copy_m(_II __first, _II __last, _OI __result)
     351             :         { 
     352             :           typedef typename iterator_traits<_II>::difference_type _Distance;
     353           0 :           for(_Distance __n = __last - __first; __n > 0; --__n)
     354             :             {
     355           0 :               *__result = std::move(*__first);
     356           0 :               ++__first;
     357           0 :               ++__result;
     358             :             }
     359           0 :           return __result;
     360             :         }
     361             :     };
     362             : #endif
     363             : 
     364             :   template<bool _IsMove>
     365             :     struct __copy_move<_IsMove, true, random_access_iterator_tag>
     366             :     {
     367             :       template<typename _Tp>
     368             :         static _Tp*
     369           1 :         __copy_m(const _Tp* __first, const _Tp* __last, _Tp* __result)
     370             :         {
     371             : #if __cplusplus >= 201103L
     372             :           // trivial types can have deleted assignment
     373             :           static_assert( is_copy_assignable<_Tp>::value,
     374             :                          "type is not assignable" );
     375             : #endif
     376           1 :           const ptrdiff_t _Num = __last - __first;
     377           1 :           if (_Num)
     378           0 :             __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
     379           1 :           return __result + _Num;
     380             :         }
     381             :     };
     382             : 
     383             :   template<bool _IsMove, typename _II, typename _OI>
     384             :     inline _OI
     385           6 :     __copy_move_a(_II __first, _II __last, _OI __result)
     386             :     {
     387             :       typedef typename iterator_traits<_II>::value_type _ValueTypeI;
     388             :       typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
     389             :       typedef typename iterator_traits<_II>::iterator_category _Category;
     390             :       const bool __simple = (__is_trivial(_ValueTypeI)
     391             :                              && __is_pointer<_II>::__value
     392             :                              && __is_pointer<_OI>::__value
     393           6 :                              && __are_same<_ValueTypeI, _ValueTypeO>::__value);
     394             : 
     395             :       return std::__copy_move<_IsMove, __simple,
     396           6 :                               _Category>::__copy_m(__first, __last, __result);
     397             :     }
     398             : 
     399             :   // Helpers for streambuf iterators (either istream or ostream).
     400             :   // NB: avoid including <iosfwd>, relatively large.
     401             :   template<typename _CharT>
     402             :     struct char_traits;
     403             : 
     404             :   template<typename _CharT, typename _Traits>
     405             :     class istreambuf_iterator;
     406             : 
     407             :   template<typename _CharT, typename _Traits>
     408             :     class ostreambuf_iterator;
     409             : 
     410             :   template<bool _IsMove, typename _CharT>
     411             :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 
     412             :              ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
     413             :     __copy_move_a2(_CharT*, _CharT*,
     414             :                    ostreambuf_iterator<_CharT, char_traits<_CharT> >);
     415             : 
     416             :   template<bool _IsMove, typename _CharT>
     417             :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 
     418             :              ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
     419             :     __copy_move_a2(const _CharT*, const _CharT*,
     420             :                    ostreambuf_iterator<_CharT, char_traits<_CharT> >);
     421             : 
     422             :   template<bool _IsMove, typename _CharT>
     423             :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
     424             :                                     _CharT*>::__type
     425             :     __copy_move_a2(istreambuf_iterator<_CharT, char_traits<_CharT> >,
     426             :                    istreambuf_iterator<_CharT, char_traits<_CharT> >, _CharT*);
     427             : 
     428             :   template<bool _IsMove, typename _II, typename _OI>
     429             :     inline _OI
     430           6 :     __copy_move_a2(_II __first, _II __last, _OI __result)
     431             :     {
     432             :       return _OI(std::__copy_move_a<_IsMove>(std::__niter_base(__first),
     433             :                                              std::__niter_base(__last),
     434           6 :                                              std::__niter_base(__result)));
     435             :     }
     436             : 
     437             :   /**
     438             :    *  @brief Copies the range [first,last) into result.
     439             :    *  @ingroup mutating_algorithms
     440             :    *  @param  __first  An input iterator.
     441             :    *  @param  __last   An input iterator.
     442             :    *  @param  __result An output iterator.
     443             :    *  @return   result + (first - last)
     444             :    *
     445             :    *  This inline function will boil down to a call to @c memmove whenever
     446             :    *  possible.  Failing that, if random access iterators are passed, then the
     447             :    *  loop count will be known (and therefore a candidate for compiler
     448             :    *  optimizations such as unrolling).  Result may not be contained within
     449             :    *  [first,last); the copy_backward function should be used instead.
     450             :    *
     451             :    *  Note that the end of the output range is permitted to be contained
     452             :    *  within [first,last).
     453             :   */
     454             :   template<typename _II, typename _OI>
     455             :     inline _OI
     456           6 :     copy(_II __first, _II __last, _OI __result)
     457             :     {
     458             :       // concept requirements
     459             :       __glibcxx_function_requires(_InputIteratorConcept<_II>)
     460             :       __glibcxx_function_requires(_OutputIteratorConcept<_OI,
     461             :             typename iterator_traits<_II>::value_type>)
     462             :       __glibcxx_requires_valid_range(__first, __last);
     463             : 
     464             :       return (std::__copy_move_a2<__is_move_iterator<_II>::__value>
     465             :               (std::__miter_base(__first), std::__miter_base(__last),
     466           6 :                __result));
     467             :     }
     468             : 
     469             : #if __cplusplus >= 201103L
     470             :   /**
     471             :    *  @brief Moves the range [first,last) into result.
     472             :    *  @ingroup mutating_algorithms
     473             :    *  @param  __first  An input iterator.
     474             :    *  @param  __last   An input iterator.
     475             :    *  @param  __result An output iterator.
     476             :    *  @return   result + (first - last)
     477             :    *
     478             :    *  This inline function will boil down to a call to @c memmove whenever
     479             :    *  possible.  Failing that, if random access iterators are passed, then the
     480             :    *  loop count will be known (and therefore a candidate for compiler
     481             :    *  optimizations such as unrolling).  Result may not be contained within
     482             :    *  [first,last); the move_backward function should be used instead.
     483             :    *
     484             :    *  Note that the end of the output range is permitted to be contained
     485             :    *  within [first,last).
     486             :   */
     487             :   template<typename _II, typename _OI>
     488             :     inline _OI
     489           0 :     move(_II __first, _II __last, _OI __result)
     490             :     {
     491             :       // concept requirements
     492             :       __glibcxx_function_requires(_InputIteratorConcept<_II>)
     493             :       __glibcxx_function_requires(_OutputIteratorConcept<_OI,
     494             :             typename iterator_traits<_II>::value_type>)
     495             :       __glibcxx_requires_valid_range(__first, __last);
     496             : 
     497             :       return std::__copy_move_a2<true>(std::__miter_base(__first),
     498           0 :                                        std::__miter_base(__last), __result);
     499             :     }
     500             : 
     501             : #define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::move(_Tp, _Up, _Vp)
     502             : #else
     503             : #define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::copy(_Tp, _Up, _Vp)
     504             : #endif
     505             : 
     506             :   template<bool, bool, typename>
     507             :     struct __copy_move_backward
     508             :     {
     509             :       template<typename _BI1, typename _BI2>
     510             :         static _BI2
     511             :         __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
     512             :         {
     513             :           while (__first != __last)
     514             :             *--__result = *--__last;
     515             :           return __result;
     516             :         }
     517             :     };
     518             : 
     519             : #if __cplusplus >= 201103L
     520             :   template<typename _Category>
     521             :     struct __copy_move_backward<true, false, _Category>
     522             :     {
     523             :       template<typename _BI1, typename _BI2>
     524             :         static _BI2
     525             :         __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
     526             :         {
     527             :           while (__first != __last)
     528             :             *--__result = std::move(*--__last);
     529             :           return __result;
     530             :         }
     531             :     };
     532             : #endif
     533             : 
     534             :   template<>
     535             :     struct __copy_move_backward<false, false, random_access_iterator_tag>
     536             :     {
     537             :       template<typename _BI1, typename _BI2>
     538             :         static _BI2
     539             :         __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
     540             :         {
     541             :           typename iterator_traits<_BI1>::difference_type __n;
     542             :           for (__n = __last - __first; __n > 0; --__n)
     543             :             *--__result = *--__last;
     544             :           return __result;
     545             :         }
     546             :     };
     547             : 
     548             : #if __cplusplus >= 201103L
     549             :   template<>
     550             :     struct __copy_move_backward<true, false, random_access_iterator_tag>
     551             :     {
     552             :       template<typename _BI1, typename _BI2>
     553             :         static _BI2
     554           0 :         __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
     555             :         {
     556             :           typename iterator_traits<_BI1>::difference_type __n;
     557           0 :           for (__n = __last - __first; __n > 0; --__n)
     558           0 :             *--__result = std::move(*--__last);
     559           0 :           return __result;
     560             :         }
     561             :     };
     562             : #endif
     563             : 
     564             :   template<bool _IsMove>
     565             :     struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
     566             :     {
     567             :       template<typename _Tp>
     568             :         static _Tp*
     569             :         __copy_move_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
     570             :         {
     571             : #if __cplusplus >= 201103L
     572             :           // trivial types can have deleted assignment
     573             :           static_assert( is_copy_assignable<_Tp>::value,
     574             :                          "type is not assignable" );
     575             : #endif
     576             :           const ptrdiff_t _Num = __last - __first;
     577             :           if (_Num)
     578             :             __builtin_memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
     579             :           return __result - _Num;
     580             :         }
     581             :     };
     582             : 
     583             :   template<bool _IsMove, typename _BI1, typename _BI2>
     584             :     inline _BI2
     585           0 :     __copy_move_backward_a(_BI1 __first, _BI1 __last, _BI2 __result)
     586             :     {
     587             :       typedef typename iterator_traits<_BI1>::value_type _ValueType1;
     588             :       typedef typename iterator_traits<_BI2>::value_type _ValueType2;
     589             :       typedef typename iterator_traits<_BI1>::iterator_category _Category;
     590             :       const bool __simple = (__is_trivial(_ValueType1)
     591             :                              && __is_pointer<_BI1>::__value
     592             :                              && __is_pointer<_BI2>::__value
     593           0 :                              && __are_same<_ValueType1, _ValueType2>::__value);
     594             : 
     595             :       return std::__copy_move_backward<_IsMove, __simple,
     596             :                                        _Category>::__copy_move_b(__first,
     597             :                                                                  __last,
     598           0 :                                                                  __result);
     599             :     }
     600             : 
     601             :   template<bool _IsMove, typename _BI1, typename _BI2>
     602             :     inline _BI2
     603           0 :     __copy_move_backward_a2(_BI1 __first, _BI1 __last, _BI2 __result)
     604             :     {
     605             :       return _BI2(std::__copy_move_backward_a<_IsMove>
     606             :                   (std::__niter_base(__first), std::__niter_base(__last),
     607           0 :                    std::__niter_base(__result)));
     608             :     }
     609             : 
     610             :   /**
     611             :    *  @brief Copies the range [first,last) into result.
     612             :    *  @ingroup mutating_algorithms
     613             :    *  @param  __first  A bidirectional iterator.
     614             :    *  @param  __last   A bidirectional iterator.
     615             :    *  @param  __result A bidirectional iterator.
     616             :    *  @return   result - (first - last)
     617             :    *
     618             :    *  The function has the same effect as copy, but starts at the end of the
     619             :    *  range and works its way to the start, returning the start of the result.
     620             :    *  This inline function will boil down to a call to @c memmove whenever
     621             :    *  possible.  Failing that, if random access iterators are passed, then the
     622             :    *  loop count will be known (and therefore a candidate for compiler
     623             :    *  optimizations such as unrolling).
     624             :    *
     625             :    *  Result may not be in the range (first,last].  Use copy instead.  Note
     626             :    *  that the start of the output range may overlap [first,last).
     627             :   */
     628             :   template<typename _BI1, typename _BI2>
     629             :     inline _BI2
     630             :     copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
     631             :     {
     632             :       // concept requirements
     633             :       __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
     634             :       __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
     635             :       __glibcxx_function_requires(_ConvertibleConcept<
     636             :             typename iterator_traits<_BI1>::value_type,
     637             :             typename iterator_traits<_BI2>::value_type>)
     638             :       __glibcxx_requires_valid_range(__first, __last);
     639             : 
     640             :       return (std::__copy_move_backward_a2<__is_move_iterator<_BI1>::__value>
     641             :               (std::__miter_base(__first), std::__miter_base(__last),
     642             :                __result));
     643             :     }
     644             : 
     645             : #if __cplusplus >= 201103L
     646             :   /**
     647             :    *  @brief Moves the range [first,last) into result.
     648             :    *  @ingroup mutating_algorithms
     649             :    *  @param  __first  A bidirectional iterator.
     650             :    *  @param  __last   A bidirectional iterator.
     651             :    *  @param  __result A bidirectional iterator.
     652             :    *  @return   result - (first - last)
     653             :    *
     654             :    *  The function has the same effect as move, but starts at the end of the
     655             :    *  range and works its way to the start, returning the start of the result.
     656             :    *  This inline function will boil down to a call to @c memmove whenever
     657             :    *  possible.  Failing that, if random access iterators are passed, then the
     658             :    *  loop count will be known (and therefore a candidate for compiler
     659             :    *  optimizations such as unrolling).
     660             :    *
     661             :    *  Result may not be in the range (first,last].  Use move instead.  Note
     662             :    *  that the start of the output range may overlap [first,last).
     663             :   */
     664             :   template<typename _BI1, typename _BI2>
     665             :     inline _BI2
     666           0 :     move_backward(_BI1 __first, _BI1 __last, _BI2 __result)
     667             :     {
     668             :       // concept requirements
     669             :       __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
     670             :       __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
     671             :       __glibcxx_function_requires(_ConvertibleConcept<
     672             :             typename iterator_traits<_BI1>::value_type,
     673             :             typename iterator_traits<_BI2>::value_type>)
     674             :       __glibcxx_requires_valid_range(__first, __last);
     675             : 
     676             :       return std::__copy_move_backward_a2<true>(std::__miter_base(__first),
     677             :                                                 std::__miter_base(__last),
     678           0 :                                                 __result);
     679             :     }
     680             : 
     681             : #define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::move_backward(_Tp, _Up, _Vp)
     682             : #else
     683             : #define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::copy_backward(_Tp, _Up, _Vp)
     684             : #endif
     685             : 
     686             :   template<typename _ForwardIterator, typename _Tp>
     687             :     inline typename
     688             :     __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, void>::__type
     689             :     __fill_a(_ForwardIterator __first, _ForwardIterator __last,
     690             :              const _Tp& __value)
     691             :     {
     692             :       for (; __first != __last; ++__first)
     693             :         *__first = __value;
     694             :     }
     695             :     
     696             :   template<typename _ForwardIterator, typename _Tp>
     697             :     inline typename
     698             :     __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, void>::__type
     699             :     __fill_a(_ForwardIterator __first, _ForwardIterator __last,
     700             :              const _Tp& __value)
     701             :     {
     702             :       const _Tp __tmp = __value;
     703             :       for (; __first != __last; ++__first)
     704             :         *__first = __tmp;
     705             :     }
     706             : 
     707             :   // Specialization: for char types we can use memset.
     708             :   template<typename _Tp>
     709             :     inline typename
     710             :     __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
     711             :     __fill_a(_Tp* __first, _Tp* __last, const _Tp& __c)
     712             :     {
     713             :       const _Tp __tmp = __c;
     714             :       __builtin_memset(__first, static_cast<unsigned char>(__tmp),
     715             :                        __last - __first);
     716             :     }
     717             : 
     718             :   /**
     719             :    *  @brief Fills the range [first,last) with copies of value.
     720             :    *  @ingroup mutating_algorithms
     721             :    *  @param  __first  A forward iterator.
     722             :    *  @param  __last   A forward iterator.
     723             :    *  @param  __value  A reference-to-const of arbitrary type.
     724             :    *  @return   Nothing.
     725             :    *
     726             :    *  This function fills a range with copies of the same value.  For char
     727             :    *  types filling contiguous areas of memory, this becomes an inline call
     728             :    *  to @c memset or @c wmemset.
     729             :   */
     730             :   template<typename _ForwardIterator, typename _Tp>
     731             :     inline void
     732             :     fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
     733             :     {
     734             :       // concept requirements
     735             :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
     736             :                                   _ForwardIterator>)
     737             :       __glibcxx_requires_valid_range(__first, __last);
     738             : 
     739             :       std::__fill_a(std::__niter_base(__first), std::__niter_base(__last),
     740             :                     __value);
     741             :     }
     742             : 
     743             :   template<typename _OutputIterator, typename _Size, typename _Tp>
     744             :     inline typename
     745             :     __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, _OutputIterator>::__type
     746             :     __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
     747             :     {
     748             :       for (__decltype(__n + 0) __niter = __n;
     749             :            __niter > 0; --__niter, ++__first)
     750             :         *__first = __value;
     751             :       return __first;
     752             :     }
     753             : 
     754             :   template<typename _OutputIterator, typename _Size, typename _Tp>
     755             :     inline typename
     756             :     __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, _OutputIterator>::__type
     757             :     __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
     758             :     {
     759             :       const _Tp __tmp = __value;
     760             :       for (__decltype(__n + 0) __niter = __n;
     761             :            __niter > 0; --__niter, ++__first)
     762             :         *__first = __tmp;
     763             :       return __first;
     764             :     }
     765             : 
     766             :   template<typename _Size, typename _Tp>
     767             :     inline typename
     768             :     __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, _Tp*>::__type
     769             :     __fill_n_a(_Tp* __first, _Size __n, const _Tp& __c)
     770             :     {
     771             :       std::__fill_a(__first, __first + __n, __c);
     772             :       return __first + __n;
     773             :     }
     774             : 
     775             :   /**
     776             :    *  @brief Fills the range [first,first+n) with copies of value.
     777             :    *  @ingroup mutating_algorithms
     778             :    *  @param  __first  An output iterator.
     779             :    *  @param  __n      The count of copies to perform.
     780             :    *  @param  __value  A reference-to-const of arbitrary type.
     781             :    *  @return   The iterator at first+n.
     782             :    *
     783             :    *  This function fills a range with copies of the same value.  For char
     784             :    *  types filling contiguous areas of memory, this becomes an inline call
     785             :    *  to @c memset or @ wmemset.
     786             :    *
     787             :    *  _GLIBCXX_RESOLVE_LIB_DEFECTS
     788             :    *  DR 865. More algorithms that throw away information
     789             :   */
     790             :   template<typename _OI, typename _Size, typename _Tp>
     791             :     inline _OI
     792             :     fill_n(_OI __first, _Size __n, const _Tp& __value)
     793             :     {
     794             :       // concept requirements
     795             :       __glibcxx_function_requires(_OutputIteratorConcept<_OI, _Tp>)
     796             : 
     797             :       return _OI(std::__fill_n_a(std::__niter_base(__first), __n, __value));
     798             :     }
     799             : 
     800             :   template<bool _BoolType>
     801             :     struct __equal
     802             :     {
     803             :       template<typename _II1, typename _II2>
     804             :         static bool
     805             :         equal(_II1 __first1, _II1 __last1, _II2 __first2)
     806             :         {
     807             :           for (; __first1 != __last1; ++__first1, ++__first2)
     808             :             if (!(*__first1 == *__first2))
     809             :               return false;
     810             :           return true;
     811             :         }
     812             :     };
     813             : 
     814             :   template<>
     815             :     struct __equal<true>
     816             :     {
     817             :       template<typename _Tp>
     818             :         static bool
     819             :         equal(const _Tp* __first1, const _Tp* __last1, const _Tp* __first2)
     820             :         {
     821             :           return !__builtin_memcmp(__first1, __first2, sizeof(_Tp)
     822             :                                    * (__last1 - __first1));
     823             :         }
     824             :     };
     825             : 
     826             :   template<typename _II1, typename _II2>
     827             :     inline bool
     828             :     __equal_aux(_II1 __first1, _II1 __last1, _II2 __first2)
     829             :     {
     830             :       typedef typename iterator_traits<_II1>::value_type _ValueType1;
     831             :       typedef typename iterator_traits<_II2>::value_type _ValueType2;
     832             :       const bool __simple = ((__is_integer<_ValueType1>::__value
     833             :                               || __is_pointer<_ValueType1>::__value)
     834             :                              && __is_pointer<_II1>::__value
     835             :                              && __is_pointer<_II2>::__value
     836             :                              && __are_same<_ValueType1, _ValueType2>::__value);
     837             : 
     838             :       return std::__equal<__simple>::equal(__first1, __last1, __first2);
     839             :     }
     840             : 
     841             :   template<typename, typename>
     842             :     struct __lc_rai
     843             :     {
     844             :       template<typename _II1, typename _II2>
     845             :         static _II1
     846             :         __newlast1(_II1, _II1 __last1, _II2, _II2)
     847             :         { return __last1; }
     848             : 
     849             :       template<typename _II>
     850             :         static bool
     851             :         __cnd2(_II __first, _II __last)
     852             :         { return __first != __last; }
     853             :     };
     854             : 
     855             :   template<>
     856             :     struct __lc_rai<random_access_iterator_tag, random_access_iterator_tag>
     857             :     {
     858             :       template<typename _RAI1, typename _RAI2>
     859             :         static _RAI1
     860             :         __newlast1(_RAI1 __first1, _RAI1 __last1,
     861             :                    _RAI2 __first2, _RAI2 __last2)
     862             :         {
     863             :           const typename iterator_traits<_RAI1>::difference_type
     864             :             __diff1 = __last1 - __first1;
     865             :           const typename iterator_traits<_RAI2>::difference_type
     866             :             __diff2 = __last2 - __first2;
     867             :           return __diff2 < __diff1 ? __first1 + __diff2 : __last1;
     868             :         }
     869             : 
     870             :       template<typename _RAI>
     871             :         static bool
     872             :         __cnd2(_RAI, _RAI)
     873             :         { return true; }
     874             :     };
     875             : 
     876             :   template<typename _II1, typename _II2, typename _Compare>
     877             :     bool
     878             :     __lexicographical_compare_impl(_II1 __first1, _II1 __last1,
     879             :                                    _II2 __first2, _II2 __last2,
     880             :                                    _Compare __comp)
     881             :     {
     882             :       typedef typename iterator_traits<_II1>::iterator_category _Category1;
     883             :       typedef typename iterator_traits<_II2>::iterator_category _Category2;
     884             :       typedef std::__lc_rai<_Category1, _Category2> __rai_type;
     885             : 
     886             :       __last1 = __rai_type::__newlast1(__first1, __last1, __first2, __last2);
     887             :       for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
     888             :            ++__first1, ++__first2)
     889             :         {
     890             :           if (__comp(__first1, __first2))
     891             :             return true;
     892             :           if (__comp(__first2, __first1))
     893             :             return false;
     894             :         }
     895             :       return __first1 == __last1 && __first2 != __last2;
     896             :     }
     897             : 
     898             :   template<bool _BoolType>
     899             :     struct __lexicographical_compare
     900             :     {
     901             :       template<typename _II1, typename _II2>
     902             :         static bool __lc(_II1, _II1, _II2, _II2);
     903             :     };
     904             : 
     905             :   template<bool _BoolType>
     906             :     template<typename _II1, typename _II2>
     907             :       bool
     908             :       __lexicographical_compare<_BoolType>::
     909             :       __lc(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
     910             :       {
     911             :         return std::__lexicographical_compare_impl(__first1, __last1,
     912             :                                                    __first2, __last2,
     913             :                                         __gnu_cxx::__ops::__iter_less_iter());
     914             :       }
     915             : 
     916             :   template<>
     917             :     struct __lexicographical_compare<true>
     918             :     {
     919             :       template<typename _Tp, typename _Up>
     920             :         static bool
     921             :         __lc(const _Tp* __first1, const _Tp* __last1,
     922             :              const _Up* __first2, const _Up* __last2)
     923             :         {
     924             :           const size_t __len1 = __last1 - __first1;
     925             :           const size_t __len2 = __last2 - __first2;
     926             :           const int __result = __builtin_memcmp(__first1, __first2,
     927             :                                                 std::min(__len1, __len2));
     928             :           return __result != 0 ? __result < 0 : __len1 < __len2;
     929             :         }
     930             :     };
     931             : 
     932             :   template<typename _II1, typename _II2>
     933             :     inline bool
     934             :     __lexicographical_compare_aux(_II1 __first1, _II1 __last1,
     935             :                                   _II2 __first2, _II2 __last2)
     936             :     {
     937             :       typedef typename iterator_traits<_II1>::value_type _ValueType1;
     938             :       typedef typename iterator_traits<_II2>::value_type _ValueType2;
     939             :       const bool __simple =
     940             :         (__is_byte<_ValueType1>::__value && __is_byte<_ValueType2>::__value
     941             :          && !__gnu_cxx::__numeric_traits<_ValueType1>::__is_signed
     942             :          && !__gnu_cxx::__numeric_traits<_ValueType2>::__is_signed
     943             :          && __is_pointer<_II1>::__value
     944             :          && __is_pointer<_II2>::__value);
     945             : 
     946             :       return std::__lexicographical_compare<__simple>::__lc(__first1, __last1,
     947             :                                                             __first2, __last2);
     948             :     }
     949             : 
     950             :   template<typename _ForwardIterator, typename _Tp, typename _Compare>
     951             :     _ForwardIterator
     952             :     __lower_bound(_ForwardIterator __first, _ForwardIterator __last,
     953             :                   const _Tp& __val, _Compare __comp)
     954             :     {
     955             :       typedef typename iterator_traits<_ForwardIterator>::difference_type
     956             :         _DistanceType;
     957             : 
     958             :       _DistanceType __len = std::distance(__first, __last);
     959             : 
     960             :       while (__len > 0)
     961             :         {
     962             :           _DistanceType __half = __len >> 1;
     963             :           _ForwardIterator __middle = __first;
     964             :           std::advance(__middle, __half);
     965             :           if (__comp(__middle, __val))
     966             :             {
     967             :               __first = __middle;
     968             :               ++__first;
     969             :               __len = __len - __half - 1;
     970             :             }
     971             :           else
     972             :             __len = __half;
     973             :         }
     974             :       return __first;
     975             :     }
     976             : 
     977             :   /**
     978             :    *  @brief Finds the first position in which @a val could be inserted
     979             :    *         without changing the ordering.
     980             :    *  @param  __first   An iterator.
     981             :    *  @param  __last    Another iterator.
     982             :    *  @param  __val     The search term.
     983             :    *  @return         An iterator pointing to the first element <em>not less
     984             :    *                  than</em> @a val, or end() if every element is less than 
     985             :    *                  @a val.
     986             :    *  @ingroup binary_search_algorithms
     987             :   */
     988             :   template<typename _ForwardIterator, typename _Tp>
     989             :     inline _ForwardIterator
     990             :     lower_bound(_ForwardIterator __first, _ForwardIterator __last,
     991             :                 const _Tp& __val)
     992             :     {
     993             :       // concept requirements
     994             :       __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
     995             :       __glibcxx_function_requires(_LessThanOpConcept<
     996             :             typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
     997             :       __glibcxx_requires_partitioned_lower(__first, __last, __val);
     998             : 
     999             :       return std::__lower_bound(__first, __last, __val,
    1000             :                                 __gnu_cxx::__ops::__iter_less_val());
    1001             :     }
    1002             : 
    1003             :   /// This is a helper function for the sort routines and for random.tcc.
    1004             :   //  Precondition: __n > 0.
    1005             :   inline _GLIBCXX_CONSTEXPR int
    1006             :   __lg(int __n)
    1007             :   { return sizeof(int) * __CHAR_BIT__  - 1 - __builtin_clz(__n); }
    1008             : 
    1009             :   inline _GLIBCXX_CONSTEXPR unsigned
    1010             :   __lg(unsigned __n)
    1011             :   { return sizeof(int) * __CHAR_BIT__  - 1 - __builtin_clz(__n); }
    1012             : 
    1013             :   inline _GLIBCXX_CONSTEXPR long
    1014           0 :   __lg(long __n)
    1015           0 :   { return sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }
    1016             : 
    1017             :   inline _GLIBCXX_CONSTEXPR unsigned long
    1018             :   __lg(unsigned long __n)
    1019             :   { return sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }
    1020             : 
    1021             :   inline _GLIBCXX_CONSTEXPR long long
    1022             :   __lg(long long __n)
    1023             :   { return sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); }
    1024             : 
    1025             :   inline _GLIBCXX_CONSTEXPR unsigned long long
    1026             :   __lg(unsigned long long __n)
    1027             :   { return sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); }
    1028             : 
    1029             : _GLIBCXX_END_NAMESPACE_VERSION
    1030             : 
    1031             : _GLIBCXX_BEGIN_NAMESPACE_ALGO
    1032             : 
    1033             :   /**
    1034             :    *  @brief Tests a range for element-wise equality.
    1035             :    *  @ingroup non_mutating_algorithms
    1036             :    *  @param  __first1  An input iterator.
    1037             :    *  @param  __last1   An input iterator.
    1038             :    *  @param  __first2  An input iterator.
    1039             :    *  @return   A boolean true or false.
    1040             :    *
    1041             :    *  This compares the elements of two ranges using @c == and returns true or
    1042             :    *  false depending on whether all of the corresponding elements of the
    1043             :    *  ranges are equal.
    1044             :   */
    1045             :   template<typename _II1, typename _II2>
    1046             :     inline bool
    1047             :     equal(_II1 __first1, _II1 __last1, _II2 __first2)
    1048             :     {
    1049             :       // concept requirements
    1050             :       __glibcxx_function_requires(_InputIteratorConcept<_II1>)
    1051             :       __glibcxx_function_requires(_InputIteratorConcept<_II2>)
    1052             :       __glibcxx_function_requires(_EqualOpConcept<
    1053             :             typename iterator_traits<_II1>::value_type,
    1054             :             typename iterator_traits<_II2>::value_type>)
    1055             :       __glibcxx_requires_valid_range(__first1, __last1);
    1056             : 
    1057             :       return std::__equal_aux(std::__niter_base(__first1),
    1058             :                               std::__niter_base(__last1),
    1059             :                               std::__niter_base(__first2));
    1060             :     }
    1061             : 
    1062             :   /**
    1063             :    *  @brief Tests a range for element-wise equality.
    1064             :    *  @ingroup non_mutating_algorithms
    1065             :    *  @param  __first1  An input iterator.
    1066             :    *  @param  __last1   An input iterator.
    1067             :    *  @param  __first2  An input iterator.
    1068             :    *  @param __binary_pred A binary predicate @link functors
    1069             :    *                  functor@endlink.
    1070             :    *  @return         A boolean true or false.
    1071             :    *
    1072             :    *  This compares the elements of two ranges using the binary_pred
    1073             :    *  parameter, and returns true or
    1074             :    *  false depending on whether all of the corresponding elements of the
    1075             :    *  ranges are equal.
    1076             :   */
    1077             :   template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
    1078             :     inline bool
    1079             :     equal(_IIter1 __first1, _IIter1 __last1,
    1080             :           _IIter2 __first2, _BinaryPredicate __binary_pred)
    1081             :     {
    1082             :       // concept requirements
    1083             :       __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
    1084             :       __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
    1085             :       __glibcxx_requires_valid_range(__first1, __last1);
    1086             : 
    1087             :       for (; __first1 != __last1; ++__first1, ++__first2)
    1088             :         if (!bool(__binary_pred(*__first1, *__first2)))
    1089             :           return false;
    1090             :       return true;
    1091             :     }
    1092             : 
    1093             : #if __cplusplus > 201103L
    1094             : 
    1095             : #define __cpp_lib_robust_nonmodifying_seq_ops 201304
    1096             : 
    1097             :   /**
    1098             :    *  @brief Tests a range for element-wise equality.
    1099             :    *  @ingroup non_mutating_algorithms
    1100             :    *  @param  __first1  An input iterator.
    1101             :    *  @param  __last1   An input iterator.
    1102             :    *  @param  __first2  An input iterator.
    1103             :    *  @param  __last2   An input iterator.
    1104             :    *  @return   A boolean true or false.
    1105             :    *
    1106             :    *  This compares the elements of two ranges using @c == and returns true or
    1107             :    *  false depending on whether all of the corresponding elements of the
    1108             :    *  ranges are equal.
    1109             :   */
    1110             :   template<typename _II1, typename _II2>
    1111             :     inline bool
    1112             :     equal(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
    1113             :     {
    1114             :       // concept requirements
    1115             :       __glibcxx_function_requires(_InputIteratorConcept<_II1>)
    1116             :       __glibcxx_function_requires(_InputIteratorConcept<_II2>)
    1117             :       __glibcxx_function_requires(_EqualOpConcept<
    1118             :             typename iterator_traits<_II1>::value_type,
    1119             :             typename iterator_traits<_II2>::value_type>)
    1120             :       __glibcxx_requires_valid_range(__first1, __last1);
    1121             :       __glibcxx_requires_valid_range(__first2, __last2);
    1122             : 
    1123             :       using _RATag = random_access_iterator_tag;
    1124             :       using _Cat1 = typename iterator_traits<_II1>::iterator_category;
    1125             :       using _Cat2 = typename iterator_traits<_II2>::iterator_category;
    1126             :       using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
    1127             :       if (_RAIters())
    1128             :         {
    1129             :           auto __d1 = std::distance(__first1, __last1);
    1130             :           auto __d2 = std::distance(__first2, __last2);
    1131             :           if (__d1 != __d2)
    1132             :             return false;
    1133             :           return _GLIBCXX_STD_A::equal(__first1, __last1, __first2);
    1134             :         }
    1135             : 
    1136             :       for (; __first1 != __last1 && __first2 != __last2; ++__first1, ++__first2)
    1137             :         if (!(*__first1 == *__first2))
    1138             :           return false;
    1139             :       return __first1 == __last1 && __first2 == __last2;
    1140             :     }
    1141             : 
    1142             :   /**
    1143             :    *  @brief Tests a range for element-wise equality.
    1144             :    *  @ingroup non_mutating_algorithms
    1145             :    *  @param  __first1  An input iterator.
    1146             :    *  @param  __last1   An input iterator.
    1147             :    *  @param  __first2  An input iterator.
    1148             :    *  @param  __last2   An input iterator.
    1149             :    *  @param __binary_pred A binary predicate @link functors
    1150             :    *                  functor@endlink.
    1151             :    *  @return         A boolean true or false.
    1152             :    *
    1153             :    *  This compares the elements of two ranges using the binary_pred
    1154             :    *  parameter, and returns true or
    1155             :    *  false depending on whether all of the corresponding elements of the
    1156             :    *  ranges are equal.
    1157             :   */
    1158             :   template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
    1159             :     inline bool
    1160             :     equal(_IIter1 __first1, _IIter1 __last1,
    1161             :           _IIter2 __first2, _IIter2 __last2, _BinaryPredicate __binary_pred)
    1162             :     {
    1163             :       // concept requirements
    1164             :       __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
    1165             :       __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
    1166             :       __glibcxx_requires_valid_range(__first1, __last1);
    1167             :       __glibcxx_requires_valid_range(__first2, __last2);
    1168             : 
    1169             :       using _RATag = random_access_iterator_tag;
    1170             :       using _Cat1 = typename iterator_traits<_IIter1>::iterator_category;
    1171             :       using _Cat2 = typename iterator_traits<_IIter2>::iterator_category;
    1172             :       using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
    1173             :       if (_RAIters())
    1174             :         {
    1175             :           auto __d1 = std::distance(__first1, __last1);
    1176             :           auto __d2 = std::distance(__first2, __last2);
    1177             :           if (__d1 != __d2)
    1178             :             return false;
    1179             :           return _GLIBCXX_STD_A::equal(__first1, __last1, __first2,
    1180             :                                        __binary_pred);
    1181             :         }
    1182             : 
    1183             :       for (; __first1 != __last1 && __first2 != __last2; ++__first1, ++__first2)
    1184             :         if (!bool(__binary_pred(*__first1, *__first2)))
    1185             :           return false;
    1186             :       return __first1 == __last1 && __first2 == __last2;
    1187             :     }
    1188             : #endif
    1189             : 
    1190             :   /**
    1191             :    *  @brief Performs @b dictionary comparison on ranges.
    1192             :    *  @ingroup sorting_algorithms
    1193             :    *  @param  __first1  An input iterator.
    1194             :    *  @param  __last1   An input iterator.
    1195             :    *  @param  __first2  An input iterator.
    1196             :    *  @param  __last2   An input iterator.
    1197             :    *  @return   A boolean true or false.
    1198             :    *
    1199             :    *  <em>Returns true if the sequence of elements defined by the range
    1200             :    *  [first1,last1) is lexicographically less than the sequence of elements
    1201             :    *  defined by the range [first2,last2).  Returns false otherwise.</em>
    1202             :    *  (Quoted from [25.3.8]/1.)  If the iterators are all character pointers,
    1203             :    *  then this is an inline call to @c memcmp.
    1204             :   */
    1205             :   template<typename _II1, typename _II2>
    1206             :     inline bool
    1207             :     lexicographical_compare(_II1 __first1, _II1 __last1,
    1208             :                             _II2 __first2, _II2 __last2)
    1209             :     {
    1210             : #ifdef _GLIBCXX_CONCEPT_CHECKS
    1211             :       // concept requirements
    1212             :       typedef typename iterator_traits<_II1>::value_type _ValueType1;
    1213             :       typedef typename iterator_traits<_II2>::value_type _ValueType2;
    1214             : #endif
    1215             :       __glibcxx_function_requires(_InputIteratorConcept<_II1>)
    1216             :       __glibcxx_function_requires(_InputIteratorConcept<_II2>)
    1217             :       __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
    1218             :       __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
    1219             :       __glibcxx_requires_valid_range(__first1, __last1);
    1220             :       __glibcxx_requires_valid_range(__first2, __last2);
    1221             : 
    1222             :       return std::__lexicographical_compare_aux(std::__niter_base(__first1),
    1223             :                                                 std::__niter_base(__last1),
    1224             :                                                 std::__niter_base(__first2),
    1225             :                                                 std::__niter_base(__last2));
    1226             :     }
    1227             : 
    1228             :   /**
    1229             :    *  @brief Performs @b dictionary comparison on ranges.
    1230             :    *  @ingroup sorting_algorithms
    1231             :    *  @param  __first1  An input iterator.
    1232             :    *  @param  __last1   An input iterator.
    1233             :    *  @param  __first2  An input iterator.
    1234             :    *  @param  __last2   An input iterator.
    1235             :    *  @param  __comp  A @link comparison_functors comparison functor@endlink.
    1236             :    *  @return   A boolean true or false.
    1237             :    *
    1238             :    *  The same as the four-parameter @c lexicographical_compare, but uses the
    1239             :    *  comp parameter instead of @c <.
    1240             :   */
    1241             :   template<typename _II1, typename _II2, typename _Compare>
    1242             :     inline bool
    1243             :     lexicographical_compare(_II1 __first1, _II1 __last1,
    1244             :                             _II2 __first2, _II2 __last2, _Compare __comp)
    1245             :     {
    1246             :       // concept requirements
    1247             :       __glibcxx_function_requires(_InputIteratorConcept<_II1>)
    1248             :       __glibcxx_function_requires(_InputIteratorConcept<_II2>)
    1249             :       __glibcxx_requires_valid_range(__first1, __last1);
    1250             :       __glibcxx_requires_valid_range(__first2, __last2);
    1251             : 
    1252             :       return std::__lexicographical_compare_impl
    1253             :         (__first1, __last1, __first2, __last2,
    1254             :          __gnu_cxx::__ops::__iter_comp_iter(__comp));
    1255             :     }
    1256             : 
    1257             :   template<typename _InputIterator1, typename _InputIterator2,
    1258             :            typename _BinaryPredicate>
    1259             :     pair<_InputIterator1, _InputIterator2>
    1260             :     __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
    1261             :                _InputIterator2 __first2, _BinaryPredicate __binary_pred)
    1262             :     {
    1263             :       while (__first1 != __last1 && __binary_pred(__first1, __first2))
    1264             :         {
    1265             :           ++__first1;
    1266             :           ++__first2;
    1267             :         }
    1268             :       return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
    1269             :     }
    1270             : 
    1271             :   /**
    1272             :    *  @brief Finds the places in ranges which don't match.
    1273             :    *  @ingroup non_mutating_algorithms
    1274             :    *  @param  __first1  An input iterator.
    1275             :    *  @param  __last1   An input iterator.
    1276             :    *  @param  __first2  An input iterator.
    1277             :    *  @return   A pair of iterators pointing to the first mismatch.
    1278             :    *
    1279             :    *  This compares the elements of two ranges using @c == and returns a pair
    1280             :    *  of iterators.  The first iterator points into the first range, the
    1281             :    *  second iterator points into the second range, and the elements pointed
    1282             :    *  to by the iterators are not equal.
    1283             :   */
    1284             :   template<typename _InputIterator1, typename _InputIterator2>
    1285             :     inline pair<_InputIterator1, _InputIterator2>
    1286             :     mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
    1287             :              _InputIterator2 __first2)
    1288             :     {
    1289             :       // concept requirements
    1290             :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
    1291             :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
    1292             :       __glibcxx_function_requires(_EqualOpConcept<
    1293             :             typename iterator_traits<_InputIterator1>::value_type,
    1294             :             typename iterator_traits<_InputIterator2>::value_type>)
    1295             :       __glibcxx_requires_valid_range(__first1, __last1);
    1296             : 
    1297             :       return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2,
    1298             :                              __gnu_cxx::__ops::__iter_equal_to_iter());
    1299             :     }
    1300             : 
    1301             :   /**
    1302             :    *  @brief Finds the places in ranges which don't match.
    1303             :    *  @ingroup non_mutating_algorithms
    1304             :    *  @param  __first1  An input iterator.
    1305             :    *  @param  __last1   An input iterator.
    1306             :    *  @param  __first2  An input iterator.
    1307             :    *  @param __binary_pred A binary predicate @link functors
    1308             :    *         functor@endlink.
    1309             :    *  @return   A pair of iterators pointing to the first mismatch.
    1310             :    *
    1311             :    *  This compares the elements of two ranges using the binary_pred
    1312             :    *  parameter, and returns a pair
    1313             :    *  of iterators.  The first iterator points into the first range, the
    1314             :    *  second iterator points into the second range, and the elements pointed
    1315             :    *  to by the iterators are not equal.
    1316             :   */
    1317             :   template<typename _InputIterator1, typename _InputIterator2,
    1318             :            typename _BinaryPredicate>
    1319             :     inline pair<_InputIterator1, _InputIterator2>
    1320             :     mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
    1321             :              _InputIterator2 __first2, _BinaryPredicate __binary_pred)
    1322             :     {
    1323             :       // concept requirements
    1324             :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
    1325             :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
    1326             :       __glibcxx_requires_valid_range(__first1, __last1);
    1327             : 
    1328             :       return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2,
    1329             :         __gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
    1330             :     }
    1331             : 
    1332             : #if __cplusplus > 201103L
    1333             : 
    1334             :   template<typename _InputIterator1, typename _InputIterator2,
    1335             :            typename _BinaryPredicate>
    1336             :     pair<_InputIterator1, _InputIterator2>
    1337             :     __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
    1338             :                _InputIterator2 __first2, _InputIterator2 __last2,
    1339             :                _BinaryPredicate __binary_pred)
    1340             :     {
    1341             :       while (__first1 != __last1 && __first2 != __last2
    1342             :              && __binary_pred(__first1, __first2))
    1343             :         {
    1344             :           ++__first1;
    1345             :           ++__first2;
    1346             :         }
    1347             :       return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
    1348             :     }
    1349             : 
    1350             :   /**
    1351             :    *  @brief Finds the places in ranges which don't match.
    1352             :    *  @ingroup non_mutating_algorithms
    1353             :    *  @param  __first1  An input iterator.
    1354             :    *  @param  __last1   An input iterator.
    1355             :    *  @param  __first2  An input iterator.
    1356             :    *  @param  __last2   An input iterator.
    1357             :    *  @return   A pair of iterators pointing to the first mismatch.
    1358             :    *
    1359             :    *  This compares the elements of two ranges using @c == and returns a pair
    1360             :    *  of iterators.  The first iterator points into the first range, the
    1361             :    *  second iterator points into the second range, and the elements pointed
    1362             :    *  to by the iterators are not equal.
    1363             :   */
    1364             :   template<typename _InputIterator1, typename _InputIterator2>
    1365             :     inline pair<_InputIterator1, _InputIterator2>
    1366             :     mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
    1367             :              _InputIterator2 __first2, _InputIterator2 __last2)
    1368             :     {
    1369             :       // concept requirements
    1370             :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
    1371             :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
    1372             :       __glibcxx_function_requires(_EqualOpConcept<
    1373             :             typename iterator_traits<_InputIterator1>::value_type,
    1374             :             typename iterator_traits<_InputIterator2>::value_type>)
    1375             :       __glibcxx_requires_valid_range(__first1, __last1);
    1376             :       __glibcxx_requires_valid_range(__first2, __last2);
    1377             : 
    1378             :       return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2, __last2,
    1379             :                              __gnu_cxx::__ops::__iter_equal_to_iter());
    1380             :     }
    1381             : 
    1382             :   /**
    1383             :    *  @brief Finds the places in ranges which don't match.
    1384             :    *  @ingroup non_mutating_algorithms
    1385             :    *  @param  __first1  An input iterator.
    1386             :    *  @param  __last1   An input iterator.
    1387             :    *  @param  __first2  An input iterator.
    1388             :    *  @param  __last2   An input iterator.
    1389             :    *  @param __binary_pred A binary predicate @link functors
    1390             :    *         functor@endlink.
    1391             :    *  @return   A pair of iterators pointing to the first mismatch.
    1392             :    *
    1393             :    *  This compares the elements of two ranges using the binary_pred
    1394             :    *  parameter, and returns a pair
    1395             :    *  of iterators.  The first iterator points into the first range, the
    1396             :    *  second iterator points into the second range, and the elements pointed
    1397             :    *  to by the iterators are not equal.
    1398             :   */
    1399             :   template<typename _InputIterator1, typename _InputIterator2,
    1400             :            typename _BinaryPredicate>
    1401             :     inline pair<_InputIterator1, _InputIterator2>
    1402             :     mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
    1403             :              _InputIterator2 __first2, _InputIterator2 __last2,
    1404             :              _BinaryPredicate __binary_pred)
    1405             :     {
    1406             :       // concept requirements
    1407             :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
    1408             :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
    1409             :       __glibcxx_requires_valid_range(__first1, __last1);
    1410             :       __glibcxx_requires_valid_range(__first2, __last2);
    1411             : 
    1412             :       return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2, __last2,
    1413             :                              __gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
    1414             :     }
    1415             : #endif
    1416             : 
    1417             : _GLIBCXX_END_NAMESPACE_ALGO
    1418             : } // namespace std
    1419             : 
    1420             : // NB: This file is included within many other C++ includes, as a way
    1421             : // of getting the base algorithms. So, make sure that parallel bits
    1422             : // come in too if requested. 
    1423             : #ifdef _GLIBCXX_PARALLEL
    1424             : # include <parallel/algobase.h>
    1425             : #endif
    1426             : 
    1427             : #endif

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