John Newlin | f6153d9 | 2014-10-02 14:13:07 -0700 | [diff] [blame^] | 1 | // Numeric extensions -*- C++ -*- |
| 2 | |
| 3 | // Copyright (C) 2002-2014 Free Software Foundation, Inc. |
| 4 | // |
| 5 | // This file is part of the GNU ISO C++ Library. This library is free |
| 6 | // software; you can redistribute it and/or modify it under the |
| 7 | // terms of the GNU General Public License as published by the |
| 8 | // Free Software Foundation; either version 3, or (at your option) |
| 9 | // any later version. |
| 10 | |
| 11 | // This library is distributed in the hope that it will be useful, |
| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | // GNU General Public License for more details. |
| 15 | |
| 16 | // Under Section 7 of GPL version 3, you are granted additional |
| 17 | // permissions described in the GCC Runtime Library Exception, version |
| 18 | // 3.1, as published by the Free Software Foundation. |
| 19 | |
| 20 | // You should have received a copy of the GNU General Public License and |
| 21 | // a copy of the GCC Runtime Library Exception along with this program; |
| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 23 | // <http://www.gnu.org/licenses/>. |
| 24 | |
| 25 | /* |
| 26 | * |
| 27 | * Copyright (c) 1994 |
| 28 | * Hewlett-Packard Company |
| 29 | * |
| 30 | * Permission to use, copy, modify, distribute and sell this software |
| 31 | * and its documentation for any purpose is hereby granted without fee, |
| 32 | * provided that the above copyright notice appear in all copies and |
| 33 | * that both that copyright notice and this permission notice appear |
| 34 | * in supporting documentation. Hewlett-Packard Company makes no |
| 35 | * representations about the suitability of this software for any |
| 36 | * purpose. It is provided "as is" without express or implied warranty. |
| 37 | * |
| 38 | * |
| 39 | * Copyright (c) 1996 |
| 40 | * Silicon Graphics Computer Systems, Inc. |
| 41 | * |
| 42 | * Permission to use, copy, modify, distribute and sell this software |
| 43 | * and its documentation for any purpose is hereby granted without fee, |
| 44 | * provided that the above copyright notice appear in all copies and |
| 45 | * that both that copyright notice and this permission notice appear |
| 46 | * in supporting documentation. Silicon Graphics makes no |
| 47 | * representations about the suitability of this software for any |
| 48 | * purpose. It is provided "as is" without express or implied warranty. |
| 49 | */ |
| 50 | |
| 51 | /** @file ext/numeric |
| 52 | * This file is a GNU extension to the Standard C++ Library (possibly |
| 53 | * containing extensions from the HP/SGI STL subset). |
| 54 | */ |
| 55 | |
| 56 | #ifndef _EXT_NUMERIC |
| 57 | #define _EXT_NUMERIC 1 |
| 58 | |
| 59 | #pragma GCC system_header |
| 60 | |
| 61 | #include <bits/concept_check.h> |
| 62 | #include <numeric> |
| 63 | |
| 64 | #include <ext/functional> // For identity_element |
| 65 | |
| 66 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
| 67 | { |
| 68 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 69 | |
| 70 | // Returns __x ** __n, where __n >= 0. _Note that "multiplication" |
| 71 | // is required to be associative, but not necessarily commutative. |
| 72 | template<typename _Tp, typename _Integer, typename _MonoidOperation> |
| 73 | _Tp |
| 74 | __power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op) |
| 75 | { |
| 76 | if (__n == 0) |
| 77 | return identity_element(__monoid_op); |
| 78 | else |
| 79 | { |
| 80 | while ((__n & 1) == 0) |
| 81 | { |
| 82 | __n >>= 1; |
| 83 | __x = __monoid_op(__x, __x); |
| 84 | } |
| 85 | |
| 86 | _Tp __result = __x; |
| 87 | __n >>= 1; |
| 88 | while (__n != 0) |
| 89 | { |
| 90 | __x = __monoid_op(__x, __x); |
| 91 | if ((__n & 1) != 0) |
| 92 | __result = __monoid_op(__result, __x); |
| 93 | __n >>= 1; |
| 94 | } |
| 95 | return __result; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | template<typename _Tp, typename _Integer> |
| 100 | inline _Tp |
| 101 | __power(_Tp __x, _Integer __n) |
| 102 | { return __power(__x, __n, std::multiplies<_Tp>()); } |
| 103 | |
| 104 | /** |
| 105 | * This is an SGI extension. |
| 106 | * @ingroup SGIextensions |
| 107 | * @doctodo |
| 108 | */ |
| 109 | // Alias for the internal name __power. Note that power is an extension, |
| 110 | // not part of the C++ standard. |
| 111 | template<typename _Tp, typename _Integer, typename _MonoidOperation> |
| 112 | inline _Tp |
| 113 | power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op) |
| 114 | { return __power(__x, __n, __monoid_op); } |
| 115 | |
| 116 | /** |
| 117 | * This is an SGI extension. |
| 118 | * @ingroup SGIextensions |
| 119 | * @doctodo |
| 120 | */ |
| 121 | template<typename _Tp, typename _Integer> |
| 122 | inline _Tp |
| 123 | power(_Tp __x, _Integer __n) |
| 124 | { return __power(__x, __n); } |
| 125 | |
| 126 | #if __cplusplus >= 201103L |
| 127 | using std::iota; |
| 128 | #else |
| 129 | /** |
| 130 | * This is an SGI extension. |
| 131 | * @ingroup SGIextensions |
| 132 | * @doctodo |
| 133 | */ |
| 134 | // iota is not part of the C++ standard. It is an extension. |
| 135 | template<typename _ForwardIter, typename _Tp> |
| 136 | void |
| 137 | iota(_ForwardIter __first, _ForwardIter __last, _Tp __value) |
| 138 | { |
| 139 | // concept requirements |
| 140 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter>) |
| 141 | __glibcxx_function_requires(_ConvertibleConcept<_Tp, |
| 142 | typename std::iterator_traits<_ForwardIter>::value_type>) |
| 143 | |
| 144 | while (__first != __last) |
| 145 | *__first++ = __value++; |
| 146 | } |
| 147 | #endif // C++11 |
| 148 | |
| 149 | _GLIBCXX_END_NAMESPACE_VERSION |
| 150 | } // namespace |
| 151 | |
| 152 | #endif |