# 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