LTP GCOV extension - code coverage report
Current view: | directory - usr/include/c++/4.3/bits - stl_algobase.h
Test: | lcov.info
Date: | 2008-08-14 |  | Instrumented lines: | 79
Code covered: | 91.1 % |  | Executed lines: | 72

           1                 : // Core algorithmic facilities -*- C++ -*-
           2                 :
           3                 : // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
           4                 : // Free Software Foundation, Inc.
           5                 : //
           6                 : // This file is part of the GNU ISO C++ Library.  This library is free
           7                 : // software; you can redistribute it and/or modify it under the
           8                 : // terms of the GNU General Public License as published by the
           9                 : // Free Software Foundation; either version 2, or (at your option)
          10                 : // any later version.
          11                 :
          12                 : // This library is distributed in the hope that it will be useful,
          13                 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
          14                 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
          15                 : // GNU General Public License for more details.
          16                 :
          17                 : // You should have received a copy of the GNU General Public License along
          18                 : // with this library; see the file COPYING.  If not, write to the Free
          19                 : // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
          20                 : // USA.
          21                 :
          22                 : // As a special exception, you may use this file as part of a free software
          23                 : // library without restriction.  Specifically, if other files instantiate
          24                 : // templates or use macros or inline functions from this file, or you compile
          25                 : // this file and link it with other files to produce an executable, this
          26                 : // file does not by itself cause the resulting executable to be covered by
          27                 : // the GNU General Public License.  This exception does not however
          28                 : // invalidate any other reasons why the executable file might be covered by
          29                 : // the GNU General Public License.
          30                 :
          31                 : /*
          32                 :  *
          33                 :  * Copyright (c) 1994
          34                 :  * Hewlett-Packard Company
          35                 :  *
          36                 :  * Permission to use, copy, modify, distribute and sell this software
          37                 :  * and its documentation for any purpose is hereby granted without fee,
          38                 :  * provided that the above copyright notice appear in all copies and
          39                 :  * that both that copyright notice and this permission notice appear
          40                 :  * in supporting documentation.  Hewlett-Packard Company makes no
          41                 :  * representations about the suitability of this software for any
          42                 :  * purpose.  It is provided "as is" without express or implied warranty.
          43                 :  *
          44                 :  *
          45                 :  * Copyright (c) 1996-1998
          46                 :  * Silicon Graphics Computer Systems, Inc.
          47                 :  *
          48                 :  * Permission to use, copy, modify, distribute and sell this software
          49                 :  * and its documentation for any purpose is hereby granted without fee,
          50                 :  * provided that the above copyright notice appear in all copies and
          51                 :  * that both that copyright notice and this permission notice appear
          52                 :  * in supporting documentation.  Silicon Graphics makes no
          53                 :  * representations about the suitability of this software for any
          54                 :  * purpose.  It is provided "as is" without express or implied warranty.
          55                 :  */
          56                 :
          57                 : /** @file stl_algobase.h
          58                 :  *  This is an internal header file, included by other library headers.
          59                 :  *  You should not attempt to use it directly.
          60                 :  */
          61                 :
          62                 : #ifndef _STL_ALGOBASE_H
          63                 : #define _STL_ALGOBASE_H 1
          64                 :
          65                 : #include <bits/c++config.h>
          66                 : #include <cstddef>
          67                 : #include <bits/functexcept.h>
          68                 : #include <bits/cpp_type_traits.h>
          69                 : #include <ext/type_traits.h>
          70                 : #include <ext/numeric_traits.h>
          71                 : #include <bits/stl_pair.h>
          72                 : #include <bits/stl_iterator_base_types.h>
          73                 : #include <bits/stl_iterator_base_funcs.h>
          74                 : #include <bits/stl_iterator.h>
          75                 : #include <bits/concept_check.h>
          76                 : #include <debug/debug.h>
          77                 : #include <bits/stl_move.h> // For std::swap and _GLIBCXX_MOVE
          78                 :
          79                 : _GLIBCXX_BEGIN_NAMESPACE(std)
          80                 :
          81                 :   // See http://gcc.gnu.org/ml/libstdc++/2004-08/msg00167.html: in a
          82                 :   // nutshell, we are partially implementing the resolution of DR 187,
          83                 :   // when it's safe, i.e., the value_types are equal.
          84                 :   template<bool _BoolType>
          85                 :     struct __iter_swap
          86                 :     {
          87                 :       template<typename _ForwardIterator1, typename _ForwardIterator2>
          88                 :         static void
          89                 :         iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
          90                 :         {
          91                 :           typedef typename iterator_traits<_ForwardIterator1>::value_type
          92                 :             _ValueType1;
          93                 :           _ValueType1 __tmp = _GLIBCXX_MOVE(*__a);
          94                 :           *__a = _GLIBCXX_MOVE(*__b);
          95                 :           *__b = _GLIBCXX_MOVE(__tmp);
          96                 :         }
          97                 :     };
          98                 :
          99                 :   template<>
         100                 :     struct __iter_swap<true>
         101                 :     {
         102                 :       template<typename _ForwardIterator1, typename _ForwardIterator2>
         103                 :         static void
         104            7080 :         iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
         105                 :         {
         106            7080 :           swap(*__a, *__b);
         107            7080 :         }
         108                 :     };
         109                 :
         110                 :   /**
         111                 :    *  @brief Swaps the contents of two iterators.
         112                 :    *  @param  a  An iterator.
         113                 :    *  @param  b  Another iterator.
         114                 :    *  @return   Nothing.
         115                 :    *
         116                 :    *  This function swaps the values pointed to by two iterators, not the
         117                 :    *  iterators themselves.
         118                 :   */
         119                 :   template<typename _ForwardIterator1, typename _ForwardIterator2>
         120                 :     inline void
         121            7080 :     iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
         122                 :     {
         123                 :       typedef typename iterator_traits<_ForwardIterator1>::value_type
         124                 :         _ValueType1;
         125                 :       typedef typename iterator_traits<_ForwardIterator2>::value_type
         126                 :         _ValueType2;
         127                 :
         128                 :       // concept requirements
         129                 :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
         130                 :                                   _ForwardIterator1>)
         131                 :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
         132                 :                                   _ForwardIterator2>)
         133                 :       __glibcxx_function_requires(_ConvertibleConcept<_ValueType1,
         134                 :                                   _ValueType2>)
         135                 :       __glibcxx_function_requires(_ConvertibleConcept<_ValueType2,
         136                 :                                   _ValueType1>)
         137                 :
         138                 :       typedef typename iterator_traits<_ForwardIterator1>::reference
         139                 :         _ReferenceType1;
         140                 :       typedef typename iterator_traits<_ForwardIterator2>::reference
         141                 :         _ReferenceType2;
         142            7080 :       std::__iter_swap<__are_same<_ValueType1, _ValueType2>::__value
         143                 :         && __are_same<_ValueType1&, _ReferenceType1>::__value
         144                 :         && __are_same<_ValueType2&, _ReferenceType2>::__value>::
         145                 :         iter_swap(__a, __b);
         146            7080 :     }
         147                 :
         148                 :   /**
         149                 :    *  @brief Swap the elements of two sequences.
         150                 :    *  @param  first1  A forward iterator.
         151                 :    *  @param  last1   A forward iterator.
         152                 :    *  @param  first2  A forward iterator.
         153                 :    *  @return   An iterator equal to @p first2+(last1-first1).
         154                 :    *
         155                 :    *  Swaps each element in the range @p [first1,last1) with the
         156                 :    *  corresponding element in the range @p [first2,(last1-first1)).
         157                 :    *  The ranges must not overlap.
         158                 :   */
         159                 :   template<typename _ForwardIterator1, typename _ForwardIterator2>
         160                 :     _ForwardIterator2
         161                 :     swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
         162                 :                 _ForwardIterator2 __first2)
         163                 :     {
         164                 :       // concept requirements
         165                 :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
         166                 :                                   _ForwardIterator1>)
         167                 :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
         168                 :                                   _ForwardIterator2>)
         169                 :       __glibcxx_requires_valid_range(__first1, __last1);
         170                 :
         171                 :       for (; __first1 != __last1; ++__first1, ++__first2)
         172                 :         std::iter_swap(__first1, __first2);
         173                 :       return __first2;
         174                 :     }
         175                 :
         176                 :   /**
         177                 :    *  @brief This does what you think it does.
         178                 :    *  @param  a  A thing of arbitrary type.
         179                 :    *  @param  b  Another thing of arbitrary type.
         180                 :    *  @return   The lesser of the parameters.
         181                 :    *
         182                 :    *  This is the simple classic generic implementation.  It will work on
         183                 :    *  temporary expressions, since they are only evaluated once, unlike a
         184                 :    *  preprocessor macro.
         185                 :   */
         186                 :   template<typename _Tp>
         187                 :     inline const _Tp&
         188               0 :     min(const _Tp& __a, const _Tp& __b)
         189                 :     {
         190                 :       // concept requirements
         191                 :       __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
         192                 :       //return __b < __a ? __b : __a;
         193               0 :       if (__b < __a)
         194               0 :         return __b;
         195               0 :       return __a;
         196                 :     }
         197                 :
         198                 :   /**
         199                 :    *  @brief This does what you think it does.
         200                 :    *  @param  a  A thing of arbitrary type.
         201                 :    *  @param  b  Another thing of arbitrary type.
         202                 :    *  @return   The greater of the parameters.
         203                 :    *
         204                 :    *  This is the simple classic generic implementation.  It will work on
         205                 :    *  temporary expressions, since they are only evaluated once, unlike a
         206                 :    *  preprocessor macro.
         207                 :   */
         208                 :   template<typename _Tp>
         209                 :     inline const _Tp&
         210           20743 :     max(const _Tp& __a, const _Tp& __b)
         211                 :     {
         212                 :       // concept requirements
         213                 :       __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
         214                 :       //return  __a < __b ? __b : __a;
         215           20743 :       if (__a < __b)
         216            4790 :         return __b;
         217           15953 :       return __a;
         218                 :     }
         219                 :
         220                 :   /**
         221                 :    *  @brief This does what you think it does.
         222                 :    *  @param  a  A thing of arbitrary type.
         223                 :    *  @param  b  Another thing of arbitrary type.
         224                 :    *  @param  comp  A @link s20_3_3_comparisons comparison functor@endlink.
         225                 :    *  @return   The lesser of the parameters.
         226                 :    *
         227                 :    *  This will work on temporary expressions, since they are only evaluated
         228                 :    *  once, unlike a preprocessor macro.
         229                 :   */
         230                 :   template<typename _Tp, typename _Compare>
         231                 :     inline const _Tp&
         232                 :     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
         233                 :     {
         234                 :       //return __comp(__b, __a) ? __b : __a;
         235                 :       if (__comp(__b, __a))
         236                 :         return __b;
         237                 :       return __a;
         238                 :     }
         239                 :
         240                 :   /**
         241                 :    *  @brief This does what you think it does.
         242                 :    *  @param  a  A thing of arbitrary type.
         243                 :    *  @param  b  Another thing of arbitrary type.
         244                 :    *  @param  comp  A @link s20_3_3_comparisons comparison functor@endlink.
         245                 :    *  @return   The greater of the parameters.
         246                 :    *
         247                 :    *  This will work on temporary expressions, since they are only evaluated
         248                 :    *  once, unlike a preprocessor macro.
         249                 :   */
         250                 :   template<typename _Tp, typename _Compare>
         251                 :     inline const _Tp&
         252                 :     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
         253                 :     {
         254                 :       //return __comp(__a, __b) ? __b : __a;
         255                 :       if (__comp(__a, __b))
         256                 :         return __b;
         257                 :       return __a;
         258                 :     }
         259                 :
         260                 :
         261                 :   // If _Iterator is a __normal_iterator return its base (a plain pointer,
         262                 :   // normally) otherwise return it untouched.  See copy, fill, ...
         263                 :   template<typename _Iterator,
         264                 :            bool _IsNormal = __is_normal_iterator<_Iterator>::__value>
         265                 :     struct __niter_base
         266                 :     {
         267                 :       static _Iterator
         268          256058 :       __b(_Iterator __it)
         269          256058 :       { return __it; }
         270                 :     };
         271                 :
         272                 :   template<typename _Iterator>
         273                 :     struct __niter_base<_Iterator, true>
         274                 :     {
         275                 :       static typename _Iterator::iterator_type
         276           23362 :       __b(_Iterator __it)
         277           23362 :       { return __it.base(); }
         278                 :     };
         279                 :
         280                 :   // Likewise, for move_iterator.
         281                 :   template<typename _Iterator,
         282                 :            bool _IsMove = __is_move_iterator<_Iterator>::__value>
         283                 :     struct __miter_base
         284                 :     {
         285                 :       static _Iterator
         286          156418 :       __b(_Iterator __it)
         287          156418 :       { return __it; }
         288                 :     };
         289                 :
         290                 :   template<typename _Iterator>
         291                 :     struct __miter_base<_Iterator, true>
         292                 :     {
         293                 :       static typename _Iterator::iterator_type
         294                 :       __b(_Iterator __it)
         295                 :       { return __it.base(); }
         296                 :     };
         297                 :
         298                 :   // All of these auxiliary structs serve two purposes.  (1) Replace
         299                 :   // calls to copy with memmove whenever possible.  (Memmove, not memcpy,
         300                 :   // because the input and output ranges are permitted to overlap.)
         301                 :   // (2) If we're using random access iterators, then write the loop as
         302                 :   // a for loop with an explicit count.
         303                 :
         304                 :   template<bool, bool, typename>
         305                 :     struct __copy_move
         306                 :     {
         307                 :       template<typename _II, typename _OI>
         308                 :         static _OI
         309           42335 :         __copy_m(_II __first, _II __last, _OI __result)
         310                 :         {
         311          159330 :           for (; __first != __last; ++__result, ++__first)
         312          112959 :             *__result = *__first;
         313           42335 :           return __result;
         314                 :         }
         315                 :     };
         316                 :
         317                 : #ifdef __GXX_EXPERIMENTAL_CXX0X__
         318                 :   template<typename _Category>
         319                 :     struct __copy_move<true, false, _Category>
         320                 :     {
         321                 :       template<typename _II, typename _OI>
         322                 :         static _OI
         323                 :         __copy_m(_II __first, _II __last, _OI __result)
         324                 :         {
         325                 :           for (; __first != __last; ++__result, ++__first)
         326                 :             *__result = std::move(*__first);
         327                 :           return __result;
         328                 :         }
         329                 :     };
         330                 : #endif
         331                 :
         332                 :   template<>
         333                 :     struct __copy_move<false, false, random_access_iterator_tag>
         334                 :     {
         335                 :       template<typename _II, typename _OI>
         336                 :         static _OI
         337             945 :         __copy_m(_II __first, _II __last, _OI __result)
         338                 :         {
         339                 :           typedef typename iterator_traits<_II>::difference_type _Distance;
         340           12957 :           for(_Distance __n = __last - __first; __n > 0; --__n)
         341                 :             {
         342           12012 :               *__result = *__first;
         343           12012 :               ++__first;
         344           12012 :               ++__result;
         345                 :             }
         346             945 :           return __result;
         347                 :         }
         348                 :     };
         349                 :
         350                 : #ifdef __GXX_EXPERIMENTAL_CXX0X__
         351                 :   template<>
         352                 :     struct __copy_move<true, false, random_access_iterator_tag>
         353                 :     {
         354                 :       template<typename _II, typename _OI>
         355                 :         static _OI
         356                 :         __copy_m(_II __first, _II __last, _OI __result)
         357                 :         {
         358                 :           typedef typename iterator_traits<_II>::difference_type _Distance;
         359                 :           for(_Distance __n = __last - __first; __n > 0; --__n)
         360                 :             {
         361                 :               *__result = std::move(*__first);
         362                 :               ++__first;
         363                 :               ++__result;
         364                 :             }
         365                 :           return __result;
         366                 :         }
         367                 :     };
         368                 : #endif
         369                 :
         370                 :   template<bool _IsMove>
         371                 :     struct __copy_move<_IsMove, true, random_access_iterator_tag>
         372                 :     {
         373                 :       template<typename _Tp>
         374                 :         static _Tp*
         375           27153 :         __copy_m(const _Tp* __first, const _Tp* __last, _Tp* __result)
         376                 :         {
         377           27153 :           __builtin_memmove(__result, __first,
         378                 :                             sizeof(_Tp) * (__last - __first));
         379           27153 :           return __result + (__last - __first);
         380                 :         }
         381                 :     };
         382                 :
         383                 :   template<bool _IsMove, typename _II, typename _OI>
         384                 :     inline _OI
         385           70433 :     __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_pod(_ValueTypeI)
         391                 :                              && __is_pointer<_II>::__value
         392                 :                              && __is_pointer<_OI>::__value
         393           70433 :                              && __are_same<_ValueTypeI, _ValueTypeO>::__value);
         394                 :
         395                 :       return std::__copy_move<_IsMove, __simple,
         396           70433 :                               _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           70433 :     __copy_move_a2(_II __first, _II __last, _OI __result)
         431                 :     {
         432                 :       return _OI(std::__copy_move_a<_IsMove>
         433                 :                  (std::__niter_base<_II>::__b(__first),
         434                 :                   std::__niter_base<_II>::__b(__last),
         435           70433 :                   std::__niter_base<_OI>::__b(__result)));
         436                 :     }
         437                 :
         438                 :   /**
         439                 :    *  @brief Copies the range [first,last) into result.
         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           70433 :     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<_II>::__b(__first),
         466           70433 :                std::__miter_base<_II>::__b(__last), __result));
         467                 :     }
         468                 :
         469                 : #ifdef __GXX_EXPERIMENTAL_CXX0X__
         470                 :   /**
         471                 :    *  @brief Moves the range [first,last) into result.
         472                 :    *  @param  first  An input iterator.
         473                 :    *  @param  last   An input iterator.
         474                 :    *  @param  result An output iterator.
         475                 :    *  @return   result + (first - last)
         476                 :    *
         477                 :    *  This inline function will boil down to a call to @c memmove whenever
         478                 :    *  possible.  Failing that, if random access iterators are passed, then the
         479                 :    *  loop count will be known (and therefore a candidate for compiler
         480                 :    *  optimizations such as unrolling).  Result may not be contained within
         481                 :    *  [first,last); the move_backward function should be used instead.
         482                 :    *
         483                 :    *  Note that the end of the output range is permitted to be contained
         484                 :    *  within [first,last).
         485                 :   */
         486                 :   template<typename _II, typename _OI>
         487                 :     inline _OI
         488                 :     move(_II __first, _II __last, _OI __result)
         489                 :     {
         490                 :       // concept requirements
         491                 :       __glibcxx_function_requires(_InputIteratorConcept<_II>)
         492                 :       __glibcxx_function_requires(_OutputIteratorConcept<_OI,
         493                 :             typename iterator_traits<_II>::value_type>)
         494                 :       __glibcxx_requires_valid_range(__first, __last);
         495                 :
         496                 :       return (std::__copy_move_a2<true>
         497                 :               (std::__miter_base<_II>::__b(__first),
         498                 :                std::__miter_base<_II>::__b(__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                 : #ifdef __GXX_EXPERIMENTAL_CXX0X__
         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             150 :         __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
         540                 :         {
         541                 :           typename iterator_traits<_BI1>::difference_type __n;
         542             524 :           for (__n = __last - __first; __n > 0; --__n)
         543             374 :             *--__result = *--__last;
         544             150 :           return __result;
         545                 :         }
         546                 :     };
         547                 :
         548                 : #ifdef __GXX_EXPERIMENTAL_CXX0X__
         549                 :   template<>
         550                 :     struct __copy_move_backward<true, false, random_access_iterator_tag>
         551                 :     {
         552                 :       template<typename _BI1, typename _BI2>
         553                 :         static _BI2
         554                 :         __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
         555                 :         {
         556                 :           typename iterator_traits<_BI1>::difference_type __n;
         557                 :           for (__n = __last - __first; __n > 0; --__n)
         558                 :             *--__result = std::move(*--__last);
         559                 :           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            7626 :         __copy_move_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
         570                 :         {
         571            7626 :           const ptrdiff_t _Num = __last - __first;
         572            7626 :           __builtin_memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
         573            7626 :           return __result - _Num;
         574                 :         }
         575                 :     };
         576                 :
         577                 :   template<bool _IsMove, typename _BI1, typename _BI2>
         578                 :     inline _BI2
         579            7776 :     __copy_move_backward_a(_BI1 __first, _BI1 __last, _BI2 __result)
         580                 :     {
         581                 :       typedef typename iterator_traits<_BI1>::value_type _ValueType1;
         582                 :       typedef typename iterator_traits<_BI2>::value_type _ValueType2;
         583                 :       typedef typename iterator_traits<_BI1>::iterator_category _Category;
         584                 :       const bool __simple = (__is_pod(_ValueType1)
         585                 :                              && __is_pointer<_BI1>::__value
         586                 :                              && __is_pointer<_BI2>::__value
         587            7776 :                              && __are_same<_ValueType1, _ValueType2>::__value);
         588                 :
         589                 :       return std::__copy_move_backward<_IsMove, __simple,
         590                 :                                        _Category>::__copy_move_b(__first,
         591                 :                                                                  __last,
         592            7776 :                                                                  __result);
         593                 :     }
         594                 :
         595                 :   template<bool _IsMove, typename _BI1, typename _BI2>
         596                 :     inline _BI2
         597            7776 :     __copy_move_backward_a2(_BI1 __first, _BI1 __last, _BI2 __result)
         598                 :     {
         599                 :       return _BI2(std::__copy_move_backward_a<_IsMove>
         600                 :                   (std::__niter_base<_BI1>::__b(__first),
         601                 :                    std::__niter_base<_BI1>::__b(__last),
         602            7776 :                    std::__niter_base<_BI2>::__b(__result)));
         603                 :     }
         604                 :
         605                 :   /**
         606                 :    *  @brief Copies the range [first,last) into result.
         607                 :    *  @param  first  A bidirectional iterator.
         608                 :    *  @param  last   A bidirectional iterator.
         609                 :    *  @param  result A bidirectional iterator.
         610                 :    *  @return   result - (first - last)
         611                 :    *
         612                 :    *  The function has the same effect as copy, but starts at the end of the
         613                 :    *  range and works its way to the start, returning the start of the result.
         614                 :    *  This inline function will boil down to a call to @c memmove whenever
         615                 :    *  possible.  Failing that, if random access iterators are passed, then the
         616                 :    *  loop count will be known (and therefore a candidate for compiler
         617                 :    *  optimizations such as unrolling).
         618                 :    *
         619                 :    *  Result may not be in the range [first,last).  Use copy instead.  Note
         620                 :    *  that the start of the output range may overlap [first,last).
         621                 :   */
         622                 :   template<typename _BI1, typename _BI2>
         623                 :     inline _BI2
         624            7776 :     copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
         625                 :     {
         626                 :       // concept requirements
         627                 :       __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
         628                 :       __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
         629                 :       __glibcxx_function_requires(_ConvertibleConcept<
         630                 :             typename iterator_traits<_BI1>::value_type,
         631                 :             typename iterator_traits<_BI2>::value_type>)
         632                 :       __glibcxx_requires_valid_range(__first, __last);
         633                 :
         634                 :       return (std::__copy_move_backward_a2<__is_move_iterator<_BI1>::__value>
         635                 :               (std::__miter_base<_BI1>::__b(__first),
         636            7776 :                std::__miter_base<_BI1>::__b(__last), __result));
         637                 :     }
         638                 :
         639                 : #ifdef __GXX_EXPERIMENTAL_CXX0X__
         640                 :   /**
         641                 :    *  @brief Moves the range [first,last) into result.
         642                 :    *  @param  first  A bidirectional iterator.
         643                 :    *  @param  last   A bidirectional iterator.
         644                 :    *  @param  result A bidirectional iterator.
         645                 :    *  @return   result - (first - last)
         646                 :    *
         647                 :    *  The function has the same effect as move, but starts at the end of the
         648                 :    *  range and works its way to the start, returning the start of the result.
         649                 :    *  This inline function will boil down to a call to @c memmove whenever
         650                 :    *  possible.  Failing that, if random access iterators are passed, then the
         651                 :    *  loop count will be known (and therefore a candidate for compiler
         652                 :    *  optimizations such as unrolling).
         653                 :    *
         654                 :    *  Result may not be in the range [first,last).  Use move instead.  Note
         655                 :    *  that the start of the output range may overlap [first,last).
         656                 :   */
         657                 :   template<typename _BI1, typename _BI2>
         658                 :     inline _BI2
         659                 :     move_backward(_BI1 __first, _BI1 __last, _BI2 __result)
         660                 :     {
         661                 :       // concept requirements
         662                 :       __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
         663                 :       __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
         664                 :       __glibcxx_function_requires(_ConvertibleConcept<
         665                 :             typename iterator_traits<_BI1>::value_type,
         666                 :             typename iterator_traits<_BI2>::value_type>)
         667                 :       __glibcxx_requires_valid_range(__first, __last);
         668                 :
         669                 :       return (std::__copy_move_backward_a2<true>
         670                 :               (std::__miter_base<_BI1>::__b(__first),
         671                 :                std::__miter_base<_BI1>::__b(__last), __result));
         672                 :     }
         673                 :
         674                 : #define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::move_backward(_Tp, _Up, _Vp)
         675                 : #else
         676                 : #define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::copy_backward(_Tp, _Up, _Vp)
         677                 : #endif
         678                 :
         679                 :   template<typename _ForwardIterator, typename _Tp>
         680                 :     inline typename
         681                 :     __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, void>::__type
         682                 :     __fill_a(_ForwardIterator __first, _ForwardIterator __last,
         683           22386 :              const _Tp& __value)
         684                 :     {
         685           22386 :       for (; __first != __last; ++__first)
         686               0 :         *__first = __value;
         687           22386 :     }
         688                 :
         689                 :   template<typename _ForwardIterator, typename _Tp>
         690                 :     inline typename
         691                 :     __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, void>::__type
         692                 :     __fill_a(_ForwardIterator __first, _ForwardIterator __last,
         693                 :              const _Tp& __value)
         694                 :     {
         695                 :       const _Tp __tmp = __value;
         696                 :       for (; __first != __last; ++__first)
         697                 :         *__first = __tmp;
         698                 :     }
         699                 :
         700                 :   // Specialization: for char types we can use memset.
         701                 :   template<typename _Tp>
         702                 :     inline typename
         703                 :     __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
         704                 :     __fill_a(_Tp* __first, _Tp* __last, const _Tp& __c)
         705                 :     {
         706                 :       const _Tp __tmp = __c;
         707                 :       __builtin_memset(__first, static_cast<unsigned char>(__tmp),
         708                 :                        __last - __first);
         709                 :     }
         710                 :
         711                 :   /**
         712                 :    *  @brief Fills the range [first,last) with copies of value.
         713                 :    *  @param  first  A forward iterator.
         714                 :    *  @param  last   A forward iterator.
         715                 :    *  @param  value  A reference-to-const of arbitrary type.
         716                 :    *  @return   Nothing.
         717                 :    *
         718                 :    *  This function fills a range with copies of the same value.  For char
         719                 :    *  types filling contiguous areas of memory, this becomes an inline call
         720                 :    *  to @c memset or @c wmemset.
         721                 :   */
         722                 :   template<typename _ForwardIterator, typename _Tp>
         723                 :     inline void
         724           22386 :     fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
         725                 :     {
         726                 :       // concept requirements
         727                 :       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
         728                 :                                   _ForwardIterator>)
         729                 :       __glibcxx_requires_valid_range(__first, __last);
         730                 :
         731           22386 :       std::__fill_a(std::__niter_base<_ForwardIterator>::__b(__first),
         732                 :                     std::__niter_base<_ForwardIterator>::__b(__last), __value);
         733           22386 :     }
         734                 :
         735                 :   template<typename _OutputIterator, typename _Size, typename _Tp>
         736                 :     inline typename
         737                 :     __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, _OutputIterator>::__type
         738                 :     __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
         739                 :     {
         740                 :       for (; __n > 0; --__n, ++__first)
         741                 :         *__first = __value;
         742                 :       return __first;
         743                 :     }
         744                 :
         745                 :   template<typename _OutputIterator, typename _Size, typename _Tp>
         746                 :     inline typename
         747                 :     __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, _OutputIterator>::__type
         748               9 :     __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
         749                 :     {
         750               9 :       const _Tp __tmp = __value;
         751               9 :       for (; __n > 0; --__n, ++__first)
         752               0 :         *__first = __tmp;
         753               9 :       return __first;
         754                 :     }
         755                 :
         756                 :   template<typename _Size, typename _Tp>
         757                 :     inline typename
         758                 :     __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, _Tp*>::__type
         759                 :     __fill_n_a(_Tp* __first, _Size __n, const _Tp& __c)
         760                 :     {
         761                 :       std::__fill_a(__first, __first + __n, __c);
         762                 :       return __first + __n;
         763                 :     }
         764                 :
         765                 :   /**
         766                 :    *  @brief Fills the range [first,first+n) with copies of value.
         767                 :    *  @param  first  An output iterator.
         768                 :    *  @param  n      The count of copies to perform.
         769                 :    *  @param  value  A reference-to-const of arbitrary type.
         770                 :    *  @return   The iterator at first+n.
         771                 :    *
         772                 :    *  This function fills a range with copies of the same value.  For char
         773                 :    *  types filling contiguous areas of memory, this becomes an inline call
         774                 :    *  to @c memset or @ wmemset.
         775                 :   */
         776                 :   template<typename _OI, typename _Size, typename _Tp>
         777                 :     inline _OI
         778               9 :     fill_n(_OI __first, _Size __n, const _Tp& __value)
         779                 :     {
         780                 :       // concept requirements
         781                 :       __glibcxx_function_requires(_OutputIteratorConcept<_OI, _Tp>)
         782                 :
         783                 :       return _OI(std::__fill_n_a(std::__niter_base<_OI>::__b(__first),
         784               9 :                                  __n, __value));
         785                 :     }
         786                 :
         787                 :   template<bool _BoolType>
         788                 :     struct __equal
         789                 :     {
         790                 :       template<typename _II1, typename _II2>
         791                 :         static bool
         792               4 :         equal(_II1 __first1, _II1 __last1, _II2 __first2)
         793                 :         {
         794              51 :           for (; __first1 != __last1; ++__first1, ++__first2)
         795              47 :             if (!(*__first1 == *__first2))
         796               0 :               return false;
         797               4 :           return true;
         798                 :         }
         799                 :     };
         800                 :
         801                 :   template<>
         802                 :     struct __equal<true>
         803                 :     {
         804                 :       template<typename _Tp>
         805                 :         static bool
         806                 :         equal(const _Tp* __first1, const _Tp* __last1, const _Tp* __first2)
         807                 :         {
         808                 :           return !__builtin_memcmp(__first1, __first2, sizeof(_Tp)
         809                 :                                    * (__last1 - __first1));
         810                 :         }
         811                 :     };
         812                 :
         813                 :   template<typename _II1, typename _II2>
         814                 :     inline bool
         815               4 :     __equal_aux(_II1 __first1, _II1 __last1, _II2 __first2)
         816                 :     {
         817                 :       typedef typename iterator_traits<_II1>::value_type _ValueType1;
         818                 :       typedef typename iterator_traits<_II2>::value_type _ValueType2;
         819                 :       const bool __simple = (__is_integer<_ValueType1>::__value
         820                 :                              && __is_pointer<_II1>::__value
         821                 :                              && __is_pointer<_II2>::__value
         822               4 :                              && __are_same<_ValueType1, _ValueType2>::__value);
         823                 :
         824               4 :       return std::__equal<__simple>::equal(__first1, __last1, __first2);
         825                 :     }
         826                 :
         827                 :
         828                 :   template<typename, typename>
         829                 :     struct __lc_rai
         830                 :     {
         831                 :       template<typename _II1, typename _II2>
         832                 :         static _II1
         833                 :         __newlast1(_II1, _II1 __last1, _II2, _II2)
         834                 :         { return __last1; }
         835                 :
         836                 :       template<typename _II>
         837                 :         static bool
         838                 :         __cnd2(_II __first, _II __last)
         839                 :         { return __first != __last; }
         840                 :     };
         841                 :
         842                 :   template<>
         843                 :     struct __lc_rai<random_access_iterator_tag, random_access_iterator_tag>
         844                 :     {
         845                 :       template<typename _RAI1, typename _RAI2>
         846                 :         static _RAI1
         847                 :         __newlast1(_RAI1 __first1, _RAI1 __last1,
         848                 :                    _RAI2 __first2, _RAI2 __last2)
         849                 :         {
         850                 :           const typename iterator_traits<_RAI1>::difference_type
         851                 :             __diff1 = __last1 - __first1;
         852                 :           const typename iterator_traits<_RAI2>::difference_type
         853                 :             __diff2 = __last2 - __first2;
         854                 :           return __diff2 < __diff1 ? __first1 + __diff2 : __last1;
         855                 :         }
         856                 :
         857                 :       template<typename _RAI>
         858                 :         static bool
         859                 :         __cnd2(_RAI, _RAI)
         860                 :         { return true; }
         861                 :     };
         862                 :
         863                 :   template<bool _BoolType>
         864                 :     struct __lexicographical_compare
         865                 :     {
         866                 :       template<typename _II1, typename _II2>
         867                 :         static bool __lc(_II1, _II1, _II2, _II2);
         868                 :     };
         869                 :
         870                 :   template<bool _BoolType>
         871                 :     template<typename _II1, typename _II2>
         872                 :       bool
         873                 :       __lexicographical_compare<_BoolType>::
         874                 :       __lc(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
         875                 :       {
         876                 :         typedef typename iterator_traits<_II1>::iterator_category _Category1;
         877                 :         typedef typename iterator_traits<_II2>::iterator_category _Category2;
         878                 :         typedef std::__lc_rai<_Category1, _Category2>     __rai_type;
         879                 :
         880                 :         __last1 = __rai_type::__newlast1(__first1, __last1,
         881                 :                                          __first2, __last2);
         882                 :         for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
         883                 :              ++__first1, ++__first2)
         884                 :           {
         885                 :             if (*__first1 < *__first2)
         886                 :               return true;
         887                 :             if (*__first2 < *__first1)
         888                 :               return false;
         889                 :           }
         890                 :         return __first1 == __last1 && __first2 != __last2;
         891                 :       }
         892                 :
         893                 :   template<>
         894                 :     struct __lexicographical_compare<true>
         895                 :     {
         896                 :       template<typename _Tp, typename _Up>
         897                 :         static bool
         898                 :         __lc(const _Tp* __first1, const _Tp* __last1,
         899                 :              const _Up* __first2, const _Up* __last2)
         900                 :         {
         901                 :           const size_t __len1 = __last1 - __first1;
         902                 :           const size_t __len2 = __last2 - __first2;
         903                 :           const int __result = __builtin_memcmp(__first1, __first2,
         904                 :                                                 std::min(__len1, __len2));
         905                 :           return __result != 0 ? __result < 0 : __len1 < __len2;
         906                 :         }
         907                 :     };
         908                 :
         909                 :   template<typename _II1, typename _II2>
         910                 :     inline bool
         911                 :     __lexicographical_compare_aux(_II1 __first1, _II1 __last1,
         912                 :                                   _II2 __first2, _II2 __last2)
         913                 :     {
         914                 :       typedef typename iterator_traits<_II1>::value_type _ValueType1;
         915                 :       typedef typename iterator_traits<_II2>::value_type _ValueType2;
         916                 :       const bool __simple =
         917                 :         (__is_byte<_ValueType1>::__value && __is_byte<_ValueType2>::__value
         918                 :          && !__gnu_cxx::__numeric_traits<_ValueType1>::__is_signed
         919                 :          && !__gnu_cxx::__numeric_traits<_ValueType2>::__is_signed
         920                 :          && __is_pointer<_II1>::__value
         921                 :          && __is_pointer<_II2>::__value);
         922                 :
         923                 :       return std::__lexicographical_compare<__simple>::__lc(__first1, __last1,
         924                 :                                                             __first2, __last2);
         925                 :     }
         926                 :
         927                 : _GLIBCXX_END_NAMESPACE
         928                 :
         929                 : _GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P)
         930                 :
         931                 :   /**
         932                 :    *  @brief Tests a range for element-wise equality.
         933                 :    *  @param  first1  An input iterator.
         934                 :    *  @param  last1   An input iterator.
         935                 :    *  @param  first2  An input iterator.
         936                 :    *  @return   A boolean true or false.
         937                 :    *
         938                 :    *  This compares the elements of two ranges using @c == and returns true or
         939                 :    *  false depending on whether all of the corresponding elements of the
         940                 :    *  ranges are equal.
         941                 :   */
         942                 :   template<typename _II1, typename _II2>
         943                 :     inline bool
         944               4 :     equal(_II1 __first1, _II1 __last1, _II2 __first2)
         945                 :     {
         946                 :       // concept requirements
         947                 :       __glibcxx_function_requires(_InputIteratorConcept<_II1>)
         948                 :       __glibcxx_function_requires(_InputIteratorConcept<_II2>)
         949                 :       __glibcxx_function_requires(_EqualOpConcept<
         950                 :             typename iterator_traits<_II1>::value_type,
         951                 :             typename iterator_traits<_II2>::value_type>)
         952                 :       __glibcxx_requires_valid_range(__first1, __last1);
         953                 :
         954                 :       return std::__equal_aux(std::__niter_base<_II1>::__b(__first1),
         955                 :                               std::__niter_base<_II1>::__b(__last1),
         956               4 :                               std::__niter_base<_II2>::__b(__first2));
         957                 :     }
         958                 :
         959                 :   /**
         960                 :    *  @brief Tests a range for element-wise equality.
         961                 :    *  @param  first1  An input iterator.
         962                 :    *  @param  last1   An input iterator.
         963                 :    *  @param  first2  An input iterator.
         964                 :    *  @param binary_pred A binary predicate @link s20_3_1_base
         965                 :    *                  functor@endlink.
         966                 :    *  @return         A boolean true or false.
         967                 :    *
         968                 :    *  This compares the elements of two ranges using the binary_pred
         969                 :    *  parameter, and returns true or
         970                 :    *  false depending on whether all of the corresponding elements of the
         971                 :    *  ranges are equal.
         972                 :   */
         973                 :   template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
         974                 :     inline bool
         975                 :     equal(_IIter1 __first1, _IIter1 __last1,
         976                 :           _IIter2 __first2, _BinaryPredicate __binary_pred)
         977                 :     {
         978                 :       // concept requirements
         979                 :       __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
         980                 :       __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
         981                 :       __glibcxx_requires_valid_range(__first1, __last1);
         982                 :
         983                 :       for (; __first1 != __last1; ++__first1, ++__first2)
         984                 :         if (!bool(__binary_pred(*__first1, *__first2)))
         985                 :           return false;
         986                 :       return true;
         987                 :     }
         988                 :
         989                 :   /**
         990                 :    *  @brief Performs "dictionary" comparison on ranges.
         991                 :    *  @param  first1  An input iterator.
         992                 :    *  @param  last1   An input iterator.
         993                 :    *  @param  first2  An input iterator.
         994                 :    *  @param  last2   An input iterator.
         995                 :    *  @return   A boolean true or false.
         996                 :    *
         997                 :    *  "Returns true if the sequence of elements defined by the range
         998                 :    *  [first1,last1) is lexicographically less than the sequence of elements
         999                 :    *  defined by the range [first2,last2).  Returns false otherwise."
        1000                 :    *  (Quoted from [25.3.8]/1.)  If the iterators are all character pointers,
        1001                 :    *  then this is an inline call to @c memcmp.
        1002                 :   */
        1003                 :   template<typename _II1, typename _II2>
        1004                 :     inline bool
        1005                 :     lexicographical_compare(_II1 __first1, _II1 __last1,
        1006                 :                             _II2 __first2, _II2 __last2)
        1007                 :     {
        1008                 :       // concept requirements
        1009                 :       typedef typename iterator_traits<_II1>::value_type _ValueType1;
        1010                 :       typedef typename iterator_traits<_II2>::value_type _ValueType2;
        1011                 :       __glibcxx_function_requires(_InputIteratorConcept<_II1>)
        1012                 :       __glibcxx_function_requires(_InputIteratorConcept<_II2>)
        1013                 :       __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
        1014                 :       __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
        1015                 :       __glibcxx_requires_valid_range(__first1, __last1);
        1016                 :       __glibcxx_requires_valid_range(__first2, __last2);
        1017                 :
        1018                 :       return std::__lexicographical_compare_aux
        1019                 :         (std::__niter_base<_II1>::__b(__first1),
        1020                 :          std::__niter_base<_II1>::__b(__last1),
        1021                 :          std::__niter_base<_II2>::__b(__first2),
        1022                 :          std::__niter_base<_II2>::__b(__last2));
        1023                 :     }
        1024                 :
        1025                 :   /**
        1026                 :    *  @brief Performs "dictionary" comparison on ranges.
        1027                 :    *  @param  first1  An input iterator.
        1028                 :    *  @param  last1   An input iterator.
        1029                 :    *  @param  first2  An input iterator.
        1030                 :    *  @param  last2   An input iterator.
        1031                 :    *  @param  comp  A @link s20_3_3_comparisons comparison functor@endlink.
        1032                 :    *  @return   A boolean true or false.
        1033                 :    *
        1034                 :    *  The same as the four-parameter @c lexicographical_compare, but uses the
        1035                 :    *  comp parameter instead of @c <.
        1036                 :   */
        1037                 :   template<typename _II1, typename _II2, typename _Compare>
        1038                 :     bool
        1039                 :     lexicographical_compare(_II1 __first1, _II1 __last1,
        1040                 :                             _II2 __first2, _II2 __last2, _Compare __comp)
        1041                 :     {
        1042                 :       typedef typename iterator_traits<_II1>::iterator_category _Category1;
        1043                 :       typedef typename iterator_traits<_II2>::iterator_category _Category2;
        1044                 :       typedef std::__lc_rai<_Category1, _Category2>       __rai_type;
        1045                 :
        1046                 :       // concept requirements
        1047                 :       __glibcxx_function_requires(_InputIteratorConcept<_II1>)
        1048                 :       __glibcxx_function_requires(_InputIteratorConcept<_II2>)
        1049                 :       __glibcxx_requires_valid_range(__first1, __last1);
        1050                 :       __glibcxx_requires_valid_range(__first2, __last2);
        1051                 :
        1052                 :       __last1 = __rai_type::__newlast1(__first1, __last1, __first2, __last2);
        1053                 :       for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
        1054                 :            ++__first1, ++__first2)
        1055                 :         {
        1056                 :           if (__comp(*__first1, *__first2))
        1057                 :             return true;
        1058                 :           if (__comp(*__first2, *__first1))
        1059                 :             return false;
        1060                 :         }
        1061                 :       return __first1 == __last1 && __first2 != __last2;
        1062                 :     }
        1063                 :
        1064                 :   /**
        1065                 :    *  @brief Finds the places in ranges which don't match.
        1066                 :    *  @param  first1  An input iterator.
        1067                 :    *  @param  last1   An input iterator.
        1068                 :    *  @param  first2  An input iterator.
        1069                 :    *  @return   A pair of iterators pointing to the first mismatch.
        1070                 :    *
        1071                 :    *  This compares the elements of two ranges using @c == and returns a pair
        1072                 :    *  of iterators.  The first iterator points into the first range, the
        1073                 :    *  second iterator points into the second range, and the elements pointed
        1074                 :    *  to by the iterators are not equal.
        1075                 :   */
        1076                 :   template<typename _InputIterator1, typename _InputIterator2>
        1077                 :     pair<_InputIterator1, _InputIterator2>
        1078                 :     mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
        1079                 :              _InputIterator2 __first2)
        1080                 :     {
        1081                 :       // concept requirements
        1082                 :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
        1083                 :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
        1084                 :       __glibcxx_function_requires(_EqualOpConcept<
        1085                 :             typename iterator_traits<_InputIterator1>::value_type,
        1086                 :             typename iterator_traits<_InputIterator2>::value_type>)
        1087                 :       __glibcxx_requires_valid_range(__first1, __last1);
        1088                 :
        1089                 :       while (__first1 != __last1 && *__first1 == *__first2)
        1090                 :         {
        1091                 :           ++__first1;
        1092                 :           ++__first2;
        1093                 :         }
        1094                 :       return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
        1095                 :     }
        1096                 :
        1097                 :   /**
        1098                 :    *  @brief Finds the places in ranges which don't match.
        1099                 :    *  @param  first1  An input iterator.
        1100                 :    *  @param  last1   An input iterator.
        1101                 :    *  @param  first2  An input iterator.
        1102                 :    *  @param binary_pred A binary predicate @link s20_3_1_base
        1103                 :    *         functor@endlink.
        1104                 :    *  @return   A pair of iterators pointing to the first mismatch.
        1105                 :    *
        1106                 :    *  This compares the elements of two ranges using the binary_pred
        1107                 :    *  parameter, and returns a pair
        1108                 :    *  of iterators.  The first iterator points into the first range, the
        1109                 :    *  second iterator points into the second range, and the elements pointed
        1110                 :    *  to by the iterators are not equal.
        1111                 :   */
        1112                 :   template<typename _InputIterator1, typename _InputIterator2,
        1113                 :            typename _BinaryPredicate>
        1114                 :     pair<_InputIterator1, _InputIterator2>
        1115                 :     mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
        1116                 :              _InputIterator2 __first2, _BinaryPredicate __binary_pred)
        1117                 :     {
        1118                 :       // concept requirements
        1119                 :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
        1120                 :       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
        1121                 :       __glibcxx_requires_valid_range(__first1, __last1);
        1122                 :
        1123                 :       while (__first1 != __last1 && bool(__binary_pred(*__first1, *__first2)))
        1124                 :         {
        1125                 :           ++__first1;
        1126                 :           ++__first2;
        1127                 :         }
        1128                 :       return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
        1129                 :     }
        1130                 :
        1131                 : _GLIBCXX_END_NESTED_NAMESPACE
        1132                 :
        1133                 : // NB: This file is included within many other C++ includes, as a way
        1134                 : // of getting the base algorithms. So, make sure that parallel bits
        1135                 : // come in too if requested.
        1136                 : #ifdef _GLIBCXX_PARALLEL
        1137                 : # include <parallel/algobase.h>
        1138                 : #endif
        1139                 :
        1140                 : #endif

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