1// Numeric extensions -*- C++ -*- 2 3// Copyright (C) 2002, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 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 ext/numeric 57 * This file is a GNU extension to the Standard C++ Library (possibly 58 * containing extensions from the HP/SGI STL subset). 59 */ 60 61#ifndef _EXT_NUMERIC 62#define _EXT_NUMERIC 1 63 64#pragma GCC system_header 65 66#include <bits/concept_check.h> 67#include <numeric> 68 69#include <ext/functional> // For identity_element 70 71_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 72 73 // Returns __x ** __n, where __n >= 0. _Note that "multiplication" 74 // is required to be associative, but not necessarily commutative. 75 template<typename _Tp, typename _Integer, typename _MonoidOperation> 76 _Tp 77 __power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op) 78 { 79 if (__n == 0) 80 return identity_element(__monoid_op); 81 else 82 { 83 while ((__n & 1) == 0) 84 { 85 __n >>= 1; 86 __x = __monoid_op(__x, __x); 87 } 88 89 _Tp __result = __x; 90 __n >>= 1; 91 while (__n != 0) 92 { 93 __x = __monoid_op(__x, __x); 94 if ((__n & 1) != 0) 95 __result = __monoid_op(__result, __x); 96 __n >>= 1; 97 } 98 return __result; 99 } 100 } 101 102 template<typename _Tp, typename _Integer> 103 inline _Tp 104 __power(_Tp __x, _Integer __n) 105 { return __power(__x, __n, std::multiplies<_Tp>()); } 106 107 /** 108 * This is an SGI extension. 109 * @ingroup SGIextensions 110 * @doctodo 111 */ 112 // Alias for the internal name __power. Note that power is an extension, 113 // not part of the C++ standard. 114 template<typename _Tp, typename _Integer, typename _MonoidOperation> 115 inline _Tp 116 power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op) 117 { return __power(__x, __n, __monoid_op); } 118 119 /** 120 * This is an SGI extension. 121 * @ingroup SGIextensions 122 * @doctodo 123 */ 124 template<typename _Tp, typename _Integer> 125 inline _Tp 126 power(_Tp __x, _Integer __n) 127 { return __power(__x, __n); } 128 129 /** 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 } 147 148_GLIBCXX_END_NAMESPACE 149 150#endif 151 152