153 lines
4.6 KiB
C++
153 lines
4.6 KiB
C++
// Numeric extensions -*- C++ -*-
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// Copyright (C) 2002-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file ext/numeric
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* This file is a GNU extension to the Standard C++ Library (possibly
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* containing extensions from the HP/SGI STL subset).
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*/
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#ifndef _EXT_NUMERIC
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#define _EXT_NUMERIC 1
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#pragma GCC system_header
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#include <bits/concept_check.h>
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#include <numeric>
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#include <ext/functional> // For identity_element
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Returns __x ** __n, where __n >= 0. _Note that "multiplication"
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// is required to be associative, but not necessarily commutative.
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template<typename _Tp, typename _Integer, typename _MonoidOperation>
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_Tp
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__power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op)
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{
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if (__n == 0)
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return identity_element(__monoid_op);
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else
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{
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while ((__n & 1) == 0)
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{
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__n >>= 1;
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__x = __monoid_op(__x, __x);
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}
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_Tp __result = __x;
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__n >>= 1;
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while (__n != 0)
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{
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__x = __monoid_op(__x, __x);
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if ((__n & 1) != 0)
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__result = __monoid_op(__result, __x);
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__n >>= 1;
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}
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return __result;
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}
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}
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template<typename _Tp, typename _Integer>
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inline _Tp
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__power(_Tp __x, _Integer __n)
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{ return __power(__x, __n, std::multiplies<_Tp>()); }
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/**
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* This is an SGI extension.
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* @ingroup SGIextensions
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* @doctodo
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*/
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// Alias for the internal name __power. Note that power is an extension,
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// not part of the C++ standard.
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template<typename _Tp, typename _Integer, typename _MonoidOperation>
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inline _Tp
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power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op)
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{ return __power(__x, __n, __monoid_op); }
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/**
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* This is an SGI extension.
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* @ingroup SGIextensions
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* @doctodo
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*/
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template<typename _Tp, typename _Integer>
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inline _Tp
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power(_Tp __x, _Integer __n)
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{ return __power(__x, __n); }
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#if __cplusplus >= 201103L
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using std::iota;
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#else
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/**
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* This is an SGI extension.
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* @ingroup SGIextensions
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* @doctodo
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*/
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// iota is not part of the C++ standard. It is an extension.
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template<typename _ForwardIter, typename _Tp>
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void
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iota(_ForwardIter __first, _ForwardIter __last, _Tp __value)
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{
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// concept requirements
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__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter>)
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__glibcxx_function_requires(_ConvertibleConcept<_Tp,
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typename std::iterator_traits<_ForwardIter>::value_type>)
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while (__first != __last)
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*__first++ = __value++;
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}
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#endif // C++11
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif
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