1// -*- C++ -*-
2//===---------------------------- numeric ---------------------------------===//
3//
4//                     The LLVM Compiler Infrastructure
5//
6// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
8//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_NUMERIC
12#define _LIBCPP_NUMERIC
13
14/*
15    numeric synopsis
16
17namespace std
18{
19
20template <class InputIterator, class T>
21    T
22    accumulate(InputIterator first, InputIterator last, T init);
23
24template <class InputIterator, class T, class BinaryOperation>
25    T
26    accumulate(InputIterator first, InputIterator last, T init, BinaryOperation binary_op);
27
28template <class InputIterator1, class InputIterator2, class T>
29    T
30    inner_product(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, T init);
31
32template <class InputIterator1, class InputIterator2, class T, class BinaryOperation1, class BinaryOperation2>
33    T
34    inner_product(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2,
35                  T init, BinaryOperation1 binary_op1, BinaryOperation2 binary_op2);
36
37template <class InputIterator, class OutputIterator>
38    OutputIterator
39    partial_sum(InputIterator first, InputIterator last, OutputIterator result);
40
41template <class InputIterator, class OutputIterator, class BinaryOperation>
42    OutputIterator
43    partial_sum(InputIterator first, InputIterator last, OutputIterator result, BinaryOperation binary_op);
44
45template <class InputIterator, class OutputIterator>
46    OutputIterator
47    adjacent_difference(InputIterator first, InputIterator last, OutputIterator result);
48
49template <class InputIterator, class OutputIterator, class BinaryOperation>
50    OutputIterator
51    adjacent_difference(InputIterator first, InputIterator last, OutputIterator result, BinaryOperation binary_op);
52
53template <class ForwardIterator, class T>
54    void iota(ForwardIterator first, ForwardIterator last, T value);
55
56}  // std
57
58*/
59
60#include <__config>
61#include <iterator>
62
63#pragma GCC system_header
64
65_LIBCPP_BEGIN_NAMESPACE_STD
66
67template <class _InputIterator, class _Tp>
68inline _LIBCPP_INLINE_VISIBILITY
69_Tp
70accumulate(_InputIterator __first, _InputIterator __last, _Tp __init)
71{
72    for (; __first != __last; ++__first)
73        __init = __init + *__first;
74    return __init;
75}
76
77template <class _InputIterator, class _Tp, class _BinaryOperation>
78inline _LIBCPP_INLINE_VISIBILITY
79_Tp
80accumulate(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOperation __binary_op)
81{
82    for (; __first != __last; ++__first)
83        __init = __binary_op(__init, *__first);
84    return __init;
85}
86
87template <class _InputIterator1, class _InputIterator2, class _Tp>
88inline _LIBCPP_INLINE_VISIBILITY
89_Tp
90inner_product(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _Tp __init)
91{
92    for (; __first1 != __last1; ++__first1, ++__first2)
93        __init = __init + *__first1 * *__first2;
94    return __init;
95}
96
97template <class _InputIterator1, class _InputIterator2, class _Tp, class _BinaryOperation1, class _BinaryOperation2>
98inline _LIBCPP_INLINE_VISIBILITY
99_Tp
100inner_product(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2,
101              _Tp __init, _BinaryOperation1 __binary_op1, _BinaryOperation2 __binary_op2)
102{
103    for (; __first1 != __last1; ++__first1, ++__first2)
104        __init = __binary_op1(__init, __binary_op2(*__first1, *__first2));
105    return __init;
106}
107
108template <class _InputIterator, class _OutputIterator>
109inline _LIBCPP_INLINE_VISIBILITY
110_OutputIterator
111partial_sum(_InputIterator __first, _InputIterator __last, _OutputIterator __result)
112{
113    if (__first != __last)
114    {
115        typename iterator_traits<_InputIterator>::value_type __t(*__first);
116        *__result = __t;
117        for (++__first, ++__result; __first != __last; ++__first, ++__result)
118        {
119            __t = __t + *__first;
120            *__result = __t;
121        }
122    }
123    return __result;
124}
125
126template <class _InputIterator, class _OutputIterator, class _BinaryOperation>
127inline _LIBCPP_INLINE_VISIBILITY
128_OutputIterator
129partial_sum(_InputIterator __first, _InputIterator __last, _OutputIterator __result,
130              _BinaryOperation __binary_op)
131{
132    if (__first != __last)
133    {
134        typename iterator_traits<_InputIterator>::value_type __t(*__first);
135        *__result = __t;
136        for (++__first, ++__result; __first != __last; ++__first, ++__result)
137        {
138            __t = __binary_op(__t, *__first);
139            *__result = __t;
140        }
141    }
142    return __result;
143}
144
145template <class _InputIterator, class _OutputIterator>
146inline _LIBCPP_INLINE_VISIBILITY
147_OutputIterator
148adjacent_difference(_InputIterator __first, _InputIterator __last, _OutputIterator __result)
149{
150    if (__first != __last)
151    {
152        typename iterator_traits<_InputIterator>::value_type __t1(*__first);
153        *__result = __t1;
154        for (++__first, ++__result; __first != __last; ++__first, ++__result)
155        {
156            typename iterator_traits<_InputIterator>::value_type __t2(*__first);
157            *__result = __t2 - __t1;
158            __t1 = __t2;
159        }
160    }
161    return __result;
162}
163
164template <class _InputIterator, class _OutputIterator, class _BinaryOperation>
165inline _LIBCPP_INLINE_VISIBILITY
166_OutputIterator
167adjacent_difference(_InputIterator __first, _InputIterator __last, _OutputIterator __result,
168                      _BinaryOperation __binary_op)
169{
170    if (__first != __last)
171    {
172        typename iterator_traits<_InputIterator>::value_type __t1(*__first);
173        *__result = __t1;
174        for (++__first, ++__result; __first != __last; ++__first, ++__result)
175        {
176            typename iterator_traits<_InputIterator>::value_type __t2(*__first);
177            *__result = __binary_op(__t2, __t1);
178            __t1 = __t2;
179        }
180    }
181    return __result;
182}
183
184template <class _ForwardIterator, class _Tp>
185inline _LIBCPP_INLINE_VISIBILITY
186void
187iota(_ForwardIterator __first, _ForwardIterator __last, _Tp __value)
188{
189    for (; __first != __last; ++__first, ++__value)
190        *__first = __value;
191}
192
193_LIBCPP_END_NAMESPACE_STD
194
195#endif  // _LIBCPP_NUMERIC
196