indirect_array.h

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00001 // The template and inlines for the -*- C++ -*- indirect_array class. 00002 00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004 00004 // Free Software Foundation, Inc. 00005 // 00006 // This file is part of the GNU ISO C++ Library. This library is free 00007 // software; you can redistribute it and/or modify it under the 00008 // terms of the GNU General Public License as published by the 00009 // Free Software Foundation; either version 2, or (at your option) 00010 // any later version. 00011 00012 // This library is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 00017 // You should have received a copy of the GNU General Public License along 00018 // with this library; see the file COPYING. If not, write to the Free 00019 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 00020 // USA. 00021 00022 // As a special exception, you may use this file as part of a free software 00023 // library without restriction. Specifically, if other files instantiate 00024 // templates or use macros or inline functions from this file, or you compile 00025 // this file and link it with other files to produce an executable, this 00026 // file does not by itself cause the resulting executable to be covered by 00027 // the GNU General Public License. This exception does not however 00028 // invalidate any other reasons why the executable file might be covered by 00029 // the GNU General Public License. 00030 00031 // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr> 00032 00033 /** @file indirect_array.h 00034 * This is an internal header file, included by other library headers. 00035 * You should not attempt to use it directly. 00036 */ 00037 00038 #ifndef _INDIRECT_ARRAY_H 00039 #define _INDIRECT_ARRAY_H 1 00040 00041 #pragma GCC system_header 00042 00043 namespace std 00044 { 00045 /** 00046 * @brief Reference to arbitrary subset of an array. 00047 * 00048 * An indirect_array is a reference to the actual elements of an array 00049 * specified by an ordered array of indices. The way to get an indirect_array is to 00050 * call operator[](valarray<size_t>) on a valarray. The returned 00051 * indirect_array then permits carrying operations out on the referenced 00052 * subset of elements in the original valarray. 00053 * 00054 * For example, if an indirect_array is obtained using the array (4,2,0) as 00055 * an argument, and then assigned to an array containing (1,2,3), then the 00056 * underlying array will have array[0]==3, array[2]==2, and array[4]==1. 00057 * 00058 * @param Tp Element type. 00059 */ 00060 template <class _Tp> 00061 class indirect_array 00062 { 00063 public: 00064 typedef _Tp value_type; 00065 00066 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00067 // 253. valarray helper functions are almost entirely useless 00068 00069 /// Copy constructor. Both slices refer to the same underlying array. 00070 indirect_array(const indirect_array&); 00071 00072 /// Assignment operator. Assigns elements to corresponding elements 00073 /// of @a a. 00074 indirect_array& operator=(const indirect_array&); 00075 00076 /// Assign slice elements to corresponding elements of @a v. 00077 void operator=(const valarray<_Tp>&) const; 00078 /// Multiply slice elements by corresponding elements of @a v. 00079 void operator*=(const valarray<_Tp>&) const; 00080 /// Divide slice elements by corresponding elements of @a v. 00081 void operator/=(const valarray<_Tp>&) const; 00082 /// Modulo slice elements by corresponding elements of @a v. 00083 void operator%=(const valarray<_Tp>&) const; 00084 /// Add corresponding elements of @a v to slice elements. 00085 void operator+=(const valarray<_Tp>&) const; 00086 /// Subtract corresponding elements of @a v from slice elements. 00087 void operator-=(const valarray<_Tp>&) const; 00088 /// Logical xor slice elements with corresponding elements of @a v. 00089 void operator^=(const valarray<_Tp>&) const; 00090 /// Logical and slice elements with corresponding elements of @a v. 00091 void operator&=(const valarray<_Tp>&) const; 00092 /// Logical or slice elements with corresponding elements of @a v. 00093 void operator|=(const valarray<_Tp>&) const; 00094 /// Left shift slice elements by corresponding elements of @a v. 00095 void operator<<=(const valarray<_Tp>&) const; 00096 /// Right shift slice elements by corresponding elements of @a v. 00097 void operator>>=(const valarray<_Tp>&) const; 00098 /// Assign all slice elements to @a t. 00099 void operator= (const _Tp&) const; 00100 // ~indirect_array(); 00101 00102 template<class _Dom> 00103 void operator=(const _Expr<_Dom, _Tp>&) const; 00104 template<class _Dom> 00105 void operator*=(const _Expr<_Dom, _Tp>&) const; 00106 template<class _Dom> 00107 void operator/=(const _Expr<_Dom, _Tp>&) const; 00108 template<class _Dom> 00109 void operator%=(const _Expr<_Dom, _Tp>&) const; 00110 template<class _Dom> 00111 void operator+=(const _Expr<_Dom, _Tp>&) const; 00112 template<class _Dom> 00113 void operator-=(const _Expr<_Dom, _Tp>&) const; 00114 template<class _Dom> 00115 void operator^=(const _Expr<_Dom, _Tp>&) const; 00116 template<class _Dom> 00117 void operator&=(const _Expr<_Dom, _Tp>&) const; 00118 template<class _Dom> 00119 void operator|=(const _Expr<_Dom, _Tp>&) const; 00120 template<class _Dom> 00121 void operator<<=(const _Expr<_Dom, _Tp>&) const; 00122 template<class _Dom> 00123 void operator>>=(const _Expr<_Dom, _Tp>&) const; 00124 00125 private: 00126 /// Copy constructor. Both slices refer to the same underlying array. 00127 indirect_array(_Array<_Tp>, size_t, _Array<size_t>); 00128 00129 friend class valarray<_Tp>; 00130 friend class gslice_array<_Tp>; 00131 00132 const size_t _M_sz; 00133 const _Array<size_t> _M_index; 00134 const _Array<_Tp> _M_array; 00135 00136 // not implemented 00137 indirect_array(); 00138 }; 00139 00140 template<typename _Tp> 00141 inline 00142 indirect_array<_Tp>::indirect_array(const indirect_array<_Tp>& __a) 00143 : _M_sz(__a._M_sz), _M_index(__a._M_index), _M_array(__a._M_array) {} 00144 00145 template<typename _Tp> 00146 inline 00147 indirect_array<_Tp>::indirect_array(_Array<_Tp> __a, size_t __s, 00148 _Array<size_t> __i) 00149 : _M_sz(__s), _M_index(__i), _M_array(__a) {} 00150 00151 template<typename _Tp> 00152 inline indirect_array<_Tp>& 00153 indirect_array<_Tp>::operator=(const indirect_array<_Tp>& __a) 00154 { 00155 std::__valarray_copy(__a._M_array, _M_sz, __a._M_index, _M_array, _M_index); 00156 return *this; 00157 } 00158 00159 00160 template<typename _Tp> 00161 inline void 00162 indirect_array<_Tp>::operator=(const _Tp& __t) const 00163 { std::__valarray_fill(_M_array, _M_index, _M_sz, __t); } 00164 00165 template<typename _Tp> 00166 inline void 00167 indirect_array<_Tp>::operator=(const valarray<_Tp>& __v) const 00168 { std::__valarray_copy(_Array<_Tp>(__v), _M_sz, _M_array, _M_index); } 00169 00170 template<typename _Tp> 00171 template<class _Dom> 00172 inline void 00173 indirect_array<_Tp>::operator=(const _Expr<_Dom,_Tp>& __e) const 00174 { std::__valarray_copy(__e, _M_sz, _M_array, _M_index); } 00175 00176 #undef _DEFINE_VALARRAY_OPERATOR 00177 #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ 00178 template<typename _Tp> \ 00179 inline void \ 00180 indirect_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const\ 00181 { \ 00182 _Array_augmented_##_Name(_M_array, _M_index, _Array<_Tp>(__v), _M_sz); \ 00183 } \ 00184 \ 00185 template<typename _Tp> \ 00186 template<class _Dom> \ 00187 inline void \ 00188 indirect_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\ 00189 { \ 00190 _Array_augmented_##_Name(_M_array, _M_index, __e, _M_sz); \ 00191 } 00192 00193 _DEFINE_VALARRAY_OPERATOR(*, __multiplies) 00194 _DEFINE_VALARRAY_OPERATOR(/, __divides) 00195 _DEFINE_VALARRAY_OPERATOR(%, __modulus) 00196 _DEFINE_VALARRAY_OPERATOR(+, __plus) 00197 _DEFINE_VALARRAY_OPERATOR(-, __minus) 00198 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) 00199 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) 00200 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) 00201 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) 00202 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) 00203 00204 #undef _DEFINE_VALARRAY_OPERATOR 00205 00206 } // std:: 00207 00208 #endif /* _INDIRECT_ARRAY_H */ 00209 00210 // Local Variables: 00211 // mode:c++ 00212 // End:

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