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// Numeric extensions -*- C++ -*-
// Copyright (C) 2002, 2004 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/*
*
* Copyright (c) 1994
* Hewlett-Packard Company
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Hewlett-Packard Company makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*
* Copyright (c) 1996
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/** @file ext/numeric
* This file is a GNU extension to the Standard C++ Library (possibly
* containing extensions from the HP/SGI STL subset).
*/
#ifndef _EXT_NUMERIC
#define _EXT_NUMERIC 1
#pragma GCC system_header
#include <bits/concept_check.h>
#include <numeric>
#include <ext/functional> // For identity_element
namespace __gnu_cxx
{
// Returns __x ** __n, where __n >= 0. _Note that "multiplication"
// is required to be associative, but not necessarily commutative.
template<typename _Tp, typename _Integer, typename _MonoidOperation>
_Tp
__power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op)
{
if (__n == 0)
return identity_element(__monoid_op);
else
{
while ((__n & 1) == 0)
{
__n >>= 1;
__x = __monoid_op(__x, __x);
}
_Tp __result = __x;
__n >>= 1;
while (__n != 0)
{
__x = __monoid_op(__x, __x);
if ((__n & 1) != 0)
__result = __monoid_op(__result, __x);
__n >>= 1;
}
return __result;
}
}
template<typename _Tp, typename _Integer>
inline _Tp
__power(_Tp __x, _Integer __n)
{ return __power(__x, __n, std::multiplies<_Tp>()); }
/**
* This is an SGI extension.
* @ingroup SGIextensions
* @doctodo
*/
// Alias for the internal name __power. Note that power is an extension,
// not part of the C++ standard.
template<typename _Tp, typename _Integer, typename _MonoidOperation>
inline _Tp
power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op)
{ return __power(__x, __n, __monoid_op); }
/**
* This is an SGI extension.
* @ingroup SGIextensions
* @doctodo
*/
template<typename _Tp, typename _Integer>
inline _Tp
power(_Tp __x, _Integer __n)
{ return __power(__x, __n); }
/**
* This is an SGI extension.
* @ingroup SGIextensions
* @doctodo
*/
// iota is not part of the C++ standard. It is an extension.
template<typename _ForwardIter, typename _Tp>
void
iota(_ForwardIter __first, _ForwardIter __last, _Tp __value)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter>)
__glibcxx_function_requires(_ConvertibleConcept<_Tp,
typename std::iterator_traits<_ForwardIter>::value_type>)
while (__first != __last)
*__first++ = __value++;
}
} // namespace __gnu_cxx
#endif
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