ext/numeric

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00001 // Numeric extensions -*- C++ -*-
00002 
00003 // Copyright (C) 2002, 2004, 2005, 2009 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 3, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /*
00026  *
00027  * Copyright (c) 1994
00028  * Hewlett-Packard Company
00029  *
00030  * Permission to use, copy, modify, distribute and sell this software
00031  * and its documentation for any purpose is hereby granted without fee,
00032  * provided that the above copyright notice appear in all copies and
00033  * that both that copyright notice and this permission notice appear
00034  * in supporting documentation.  Hewlett-Packard Company makes no
00035  * representations about the suitability of this software for any
00036  * purpose.  It is provided "as is" without express or implied warranty.
00037  *
00038  *
00039  * Copyright (c) 1996
00040  * Silicon Graphics Computer Systems, Inc.
00041  *
00042  * Permission to use, copy, modify, distribute and sell this software
00043  * and its documentation for any purpose is hereby granted without fee,
00044  * provided that the above copyright notice appear in all copies and
00045  * that both that copyright notice and this permission notice appear
00046  * in supporting documentation.  Silicon Graphics makes no
00047  * representations about the suitability of this software for any
00048  * purpose.  It is provided "as is" without express or implied warranty.
00049  */
00050 
00051 /** @file ext/numeric
00052  *  This file is a GNU extension to the Standard C++ Library (possibly
00053  *  containing extensions from the HP/SGI STL subset). 
00054  */
00055 
00056 #ifndef _EXT_NUMERIC
00057 #define _EXT_NUMERIC 1
00058 
00059 #pragma GCC system_header
00060 
00061 #include <bits/concept_check.h>
00062 #include <numeric>
00063 
00064 #include <ext/functional> // For identity_element
00065 
00066 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
00067 
00068   // Returns __x ** __n, where __n >= 0.  _Note that "multiplication"
00069   // is required to be associative, but not necessarily commutative.
00070   template<typename _Tp, typename _Integer, typename _MonoidOperation>
00071     _Tp
00072     __power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op)
00073     {
00074       if (__n == 0)
00075     return identity_element(__monoid_op);
00076       else
00077     {
00078       while ((__n & 1) == 0)
00079         {
00080           __n >>= 1;
00081           __x = __monoid_op(__x, __x);
00082         }
00083 
00084       _Tp __result = __x;
00085       __n >>= 1;
00086       while (__n != 0)
00087         {
00088           __x = __monoid_op(__x, __x);
00089           if ((__n & 1) != 0)
00090         __result = __monoid_op(__result, __x);
00091           __n >>= 1;
00092         }
00093       return __result;
00094     }
00095     }
00096 
00097   template<typename _Tp, typename _Integer>
00098     inline _Tp
00099     __power(_Tp __x, _Integer __n)
00100     { return __power(__x, __n, std::multiplies<_Tp>()); }
00101 
00102   /**
00103    *  This is an SGI extension.
00104    *  @ingroup SGIextensions
00105    *  @doctodo
00106   */
00107   // Alias for the internal name __power.  Note that power is an extension,
00108   // not part of the C++ standard.
00109   template<typename _Tp, typename _Integer, typename _MonoidOperation>
00110     inline _Tp
00111     power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op)
00112     { return __power(__x, __n, __monoid_op); }
00113 
00114   /**
00115    *  This is an SGI extension.
00116    *  @ingroup SGIextensions
00117    *  @doctodo
00118   */
00119   template<typename _Tp, typename _Integer>
00120     inline _Tp
00121     power(_Tp __x, _Integer __n)
00122     { return __power(__x, __n); }
00123 
00124   /**
00125    *  This is an SGI extension.
00126    *  @ingroup SGIextensions
00127    *  @doctodo
00128   */
00129   // iota is not part of the C++ standard.  It is an extension.
00130   template<typename _ForwardIter, typename _Tp>
00131     void
00132     iota(_ForwardIter __first, _ForwardIter __last, _Tp __value)
00133     {
00134       // concept requirements
00135       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter>)
00136       __glibcxx_function_requires(_ConvertibleConcept<_Tp,
00137         typename std::iterator_traits<_ForwardIter>::value_type>)
00138 
00139       while (__first != __last)
00140     *__first++ = __value++;
00141     }
00142 
00143 _GLIBCXX_END_NAMESPACE
00144 
00145 #endif
00146 

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