libstdc++-v3/include/bits/stl_numeric.h

   1 // Numeric functions implementation -*- C++ -*-
   2
   3 // Copyright (C) 2001 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 2, 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 /*
  31  *
  32  * Copyright (c) 1994
  33  * Hewlett-Packard Company
  34  *
  35  * Permission to use, copy, modify, distribute and sell this software
  36  * and its documentation for any purpose is hereby granted without fee,
  37  * provided that the above copyright notice appear in all copies and
  38  * that both that copyright notice and this permission notice appear
  39  * in supporting documentation.  Hewlett-Packard Company makes no
  40  * representations about the suitability of this software for any
  41  * purpose.  It is provided "as is" without express or implied warranty.
  42  *
  43  *
  44  * Copyright (c) 1996,1997
  45  * Silicon Graphics Computer Systems, Inc.
  46  *
  47  * Permission to use, copy, modify, distribute and sell this software
  48  * and its documentation for any purpose is hereby granted without fee,
  49  * provided that the above copyright notice appear in all copies and
  50  * that both that copyright notice and this permission notice appear
  51  * in supporting documentation.  Silicon Graphics makes no
  52  * representations about the suitability of this software for any
  53  * purpose.  It is provided "as is" without express or implied warranty.
  54  */
  55
  56 /** @file stl_numeric.h
  57  *  This is an internal header file, included by other library headers.
  58  *  You should not attempt to use it directly.
  59  */
  60
  61 #ifndef _CPP_BITS_STL_NUMERIC_H
  62 #define _CPP_BITS_STL_NUMERIC_H 1
  63
  64 namespace std
  65 {
  66
  67   template<typename _InputIterator, typename _Tp>
  68     _Tp
  69     accumulate(_InputIterator __first, _InputIterator __last, _Tp __init)
  70     {
  71       // concept requirements
  72       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator>)
  73
  74       for ( ; __first != __last; ++__first)
  75         __init = __init + *__first;
  76       return __init;
  77     }
  78
  79   template<typename _InputIterator, typename _Tp, typename _BinaryOperation>
  80     _Tp
  81     accumulate(_InputIterator __first, _InputIterator __last, _Tp __init,
  82                _BinaryOperation __binary_op)
  83     {
  84       // concept requirements
  85       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator>)
  86
  87       for ( ; __first != __last; ++__first)
  88         __init = __binary_op(__init, *__first);
  89       return __init;
  90     }
  91
  92   template<typename _InputIterator1, typename _InputIterator2, typename _Tp>
  93     _Tp
  94     inner_product(_InputIterator1 __first1, _InputIterator1 __last1,
  95                   _InputIterator2 __first2, _Tp __init)
  96     {
  97       // concept requirements
  98       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator1>)
  99       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator2>)
 100
 101       for ( ; __first1 != __last1; ++__first1, ++__first2)
 102         __init = __init + (*__first1 * *__first2);
 103       return __init;
 104     }
 105
 106   template<typename _InputIterator1, typename _InputIterator2, typename _Tp,
 107             typename _BinaryOperation1, typename _BinaryOperation2>
 108     _Tp
 109     inner_product(_InputIterator1 __first1, _InputIterator1 __last1,
 110                   _InputIterator2 __first2, _Tp __init,
 111                   _BinaryOperation1 __binary_op1,
 112                   _BinaryOperation2 __binary_op2)
 113     {
 114       // concept requirements
 115       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator1>)
 116       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator2>)
 117
 118       for ( ; __first1 != __last1; ++__first1, ++__first2)
 119         __init = __binary_op1(__init, __binary_op2(*__first1, *__first2));
 120       return __init;
 121     }
 122
 123   template<typename _InputIterator, typename _OutputIterator>
 124     _OutputIterator
 125     partial_sum(_InputIterator __first, _InputIterator __last,
 126                 _OutputIterator __result)
 127     {
 128       typedef typename iterator_traits<_InputIterator>::value_type _ValueType;
 129
 130       // concept requirements
 131       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator>)
 132       __glibcpp_function_requires(_OutputIteratorConcept<_OutputIterator, _ValueType>)
 133
 134       if (__first == __last) return __result;
 135       *__result = *__first;
 136       _ValueType __value = *__first;
 137       while (++__first != __last) {
 138         __value = __value + *__first;
 139         *++__result = __value;
 140       }
 141       return ++__result;
 142     }
 143
 144   template<typename _InputIterator, typename _OutputIterator, typename _BinaryOperation>
 145     _OutputIterator
 146     partial_sum(_InputIterator __first, _InputIterator __last,
 147                 _OutputIterator __result, _BinaryOperation __binary_op)
 148     {
 149       typedef typename iterator_traits<_InputIterator>::value_type _ValueType;
 150
 151       // concept requirements
 152       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator>)
 153       __glibcpp_function_requires(_OutputIteratorConcept<_OutputIterator, _ValueType>)
 154
 155       if (__first == __last) return __result;
 156       *__result = *__first;
 157       _ValueType __value = *__first;
 158       while (++__first != __last) {
 159         __value = __binary_op(__value, *__first);
 160         *++__result = __value;
 161       }
 162       return ++__result;
 163     }
 164
 165   template<typename _InputIterator, typename _OutputIterator>
 166     _OutputIterator
 167     adjacent_difference(_InputIterator __first,
 168                         _InputIterator __last, _OutputIterator __result)
 169     {
 170       typedef typename iterator_traits<_InputIterator>::value_type _ValueType;
 171
 172       // concept requirements
 173       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator>)
 174       __glibcpp_function_requires(_OutputIteratorConcept<_OutputIterator, _ValueType>)
 175
 176       if (__first == __last) return __result;
 177       *__result = *__first;
 178       _ValueType __value = *__first;
 179       while (++__first != __last) {
 180         _ValueType __tmp = *__first;
 181         *++__result = __tmp - __value;
 182         __value = __tmp;
 183       }
 184       return ++__result;
 185     }
 186
 187   template<typename _InputIterator, typename _OutputIterator, typename _BinaryOperation>
 188     _OutputIterator
 189     adjacent_difference(_InputIterator __first, _InputIterator __last,
 190                         _OutputIterator __result, _BinaryOperation __binary_op)
 191     {
 192       typedef typename iterator_traits<_InputIterator>::value_type _ValueType;
 193
 194       // concept requirements
 195       __glibcpp_function_requires(_InputIteratorConcept<_InputIterator>)
 196       __glibcpp_function_requires(_OutputIteratorConcept<_OutputIterator, _ValueType>)
 197
 198       if (__first == __last) return __result;
 199       *__result = *__first;
 200       _ValueType __value = *__first;
 201       while (++__first != __last) {
 202         _ValueType __tmp = *__first;
 203         *++__result = __binary_op(__tmp, __value);
 204         __value = __tmp;
 205       }
 206       return ++__result;
 207     }
 208
 209 } // namespace std
 210
 211 #endif /* _CPP_BITS_STL_NUMERIC_H */
 212
 213 // Local Variables:
 214 // mode:C++
 215 // End: