ext/numeric

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00001 // Numeric extensions -*- C++ -*-
00002 
00003 // Copyright (C) 2002, 2004, 2005 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 2, 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 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /*
00031  *
00032  * Copyright (c) 1994
00033  * Hewlett-Packard Company
00034  *
00035  * Permission to use, copy, modify, distribute and sell this software
00036  * and its documentation for any purpose is hereby granted without fee,
00037  * provided that the above copyright notice appear in all copies and
00038  * that both that copyright notice and this permission notice appear
00039  * in supporting documentation.  Hewlett-Packard Company makes no
00040  * representations about the suitability of this software for any
00041  * purpose.  It is provided "as is" without express or implied warranty.
00042  *
00043  *
00044  * Copyright (c) 1996
00045  * Silicon Graphics Computer Systems, Inc.
00046  *
00047  * Permission to use, copy, modify, distribute and sell this software
00048  * and its documentation for any purpose is hereby granted without fee,
00049  * provided that the above copyright notice appear in all copies and
00050  * that both that copyright notice and this permission notice appear
00051  * in supporting documentation.  Silicon Graphics makes no
00052  * representations about the suitability of this software for any
00053  * purpose.  It is provided "as is" without express or implied warranty.
00054  */
00055 
00056 /** @file ext/numeric
00057  *  This file is a GNU extension to the Standard C++ Library (possibly
00058  *  containing extensions from the HP/SGI STL subset). 
00059  */
00060 
00061 #ifndef _EXT_NUMERIC
00062 #define _EXT_NUMERIC 1
00063 
00064 #pragma GCC system_header
00065 
00066 #include <bits/concept_check.h>
00067 #include <numeric>
00068 
00069 #include <ext/functional> // For identity_element
00070 
00071 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
00072 
00073   // Returns __x ** __n, where __n >= 0.  _Note that "multiplication"
00074   // is required to be associative, but not necessarily commutative.
00075   template<typename _Tp, typename _Integer, typename _MonoidOperation>
00076     _Tp
00077     __power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op)
00078     {
00079       if (__n == 0)
00080     return identity_element(__monoid_op);
00081       else
00082     {
00083       while ((__n & 1) == 0)
00084         {
00085           __n >>= 1;
00086           __x = __monoid_op(__x, __x);
00087         }
00088 
00089       _Tp __result = __x;
00090       __n >>= 1;
00091       while (__n != 0)
00092         {
00093           __x = __monoid_op(__x, __x);
00094           if ((__n & 1) != 0)
00095         __result = __monoid_op(__result, __x);
00096           __n >>= 1;
00097         }
00098       return __result;
00099     }
00100     }
00101 
00102   template<typename _Tp, typename _Integer>
00103     inline _Tp
00104     __power(_Tp __x, _Integer __n)
00105     { return __power(__x, __n, std::multiplies<_Tp>()); }
00106 
00107   /**
00108    *  This is an SGI extension.
00109    *  @ingroup SGIextensions
00110    *  @doctodo
00111   */
00112   // Alias for the internal name __power.  Note that power is an extension,
00113   // not part of the C++ standard.
00114   template<typename _Tp, typename _Integer, typename _MonoidOperation>
00115     inline _Tp
00116     power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op)
00117     { return __power(__x, __n, __monoid_op); }
00118 
00119   /**
00120    *  This is an SGI extension.
00121    *  @ingroup SGIextensions
00122    *  @doctodo
00123   */
00124   template<typename _Tp, typename _Integer>
00125     inline _Tp
00126     power(_Tp __x, _Integer __n)
00127     { return __power(__x, __n); }
00128 
00129   /**
00130    *  This is an SGI extension.
00131    *  @ingroup SGIextensions
00132    *  @doctodo
00133   */
00134   // iota is not part of the C++ standard.  It is an extension.
00135   template<typename _ForwardIter, typename _Tp>
00136     void
00137     iota(_ForwardIter __first, _ForwardIter __last, _Tp __value)
00138     {
00139       // concept requirements
00140       __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter>)
00141       __glibcxx_function_requires(_ConvertibleConcept<_Tp,
00142         typename std::iterator_traits<_ForwardIter>::value_type>)
00143 
00144       while (__first != __last)
00145     *__first++ = __value++;
00146     }
00147 
00148 _GLIBCXX_END_NAMESPACE
00149 
00150 #endif
00151 

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