1 // The template and inlines for the -*- C++ -*- gslice_array class. 2 3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2004, 2005, 2009 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /** @file gslice_array.h 27 * This is an internal header file, included by other library headers. 28 * You should not attempt to use it directly. 29 */ 30 31 // Written by Gabriel Dos Reis <Gabriel.Dos-Reis (at) DPTMaths.ENS-Cachan.Fr> 32 33 #ifndef _GSLICE_ARRAY_H 34 #define _GSLICE_ARRAY_H 1 35 36 #pragma GCC system_header 37 38 _GLIBCXX_BEGIN_NAMESPACE(std) 39 40 /** 41 * @addtogroup numeric_arrays 42 * @{ 43 */ 44 45 /** 46 * @brief Reference to multi-dimensional subset of an array. 47 * 48 * A gslice_array is a reference to the actual elements of an array 49 * specified by a gslice. The way to get a gslice_array is to call 50 * operator[](gslice) on a valarray. The returned gslice_array then 51 * permits carrying operations out on the referenced subset of elements in 52 * the original valarray. For example, operator+=(valarray) will add 53 * values to the subset of elements in the underlying valarray this 54 * gslice_array refers to. 55 * 56 * @param Tp Element type. 57 */ 58 template<typename _Tp> 59 class gslice_array 60 { 61 public: 62 typedef _Tp value_type; 63 64 // _GLIBCXX_RESOLVE_LIB_DEFECTS 65 // 253. valarray helper functions are almost entirely useless 66 67 /// Copy constructor. Both slices refer to the same underlying array. 68 gslice_array(const gslice_array&); 69 70 /// Assignment operator. Assigns slice elements to corresponding 71 /// elements of @a a. 72 gslice_array& operator=(const gslice_array&); 73 74 /// Assign slice elements to corresponding elements of @a v. 75 void operator=(const valarray<_Tp>&) const; 76 /// Multiply slice elements by corresponding elements of @a v. 77 void operator*=(const valarray<_Tp>&) const; 78 /// Divide slice elements by corresponding elements of @a v. 79 void operator/=(const valarray<_Tp>&) const; 80 /// Modulo slice elements by corresponding elements of @a v. 81 void operator%=(const valarray<_Tp>&) const; 82 /// Add corresponding elements of @a v to slice elements. 83 void operator+=(const valarray<_Tp>&) const; 84 /// Subtract corresponding elements of @a v from slice elements. 85 void operator-=(const valarray<_Tp>&) const; 86 /// Logical xor slice elements with corresponding elements of @a v. 87 void operator^=(const valarray<_Tp>&) const; 88 /// Logical and slice elements with corresponding elements of @a v. 89 void operator&=(const valarray<_Tp>&) const; 90 /// Logical or slice elements with corresponding elements of @a v. 91 void operator|=(const valarray<_Tp>&) const; 92 /// Left shift slice elements by corresponding elements of @a v. 93 void operator<<=(const valarray<_Tp>&) const; 94 /// Right shift slice elements by corresponding elements of @a v. 95 void operator>>=(const valarray<_Tp>&) const; 96 /// Assign all slice elements to @a t. 97 void operator=(const _Tp&) const; 98 99 template<class _Dom> 100 void operator=(const _Expr<_Dom, _Tp>&) const; 101 template<class _Dom> 102 void operator*=(const _Expr<_Dom, _Tp>&) const; 103 template<class _Dom> 104 void operator/=(const _Expr<_Dom, _Tp>&) const; 105 template<class _Dom> 106 void operator%=(const _Expr<_Dom, _Tp>&) const; 107 template<class _Dom> 108 void operator+=(const _Expr<_Dom, _Tp>&) const; 109 template<class _Dom> 110 void operator-=(const _Expr<_Dom, _Tp>&) const; 111 template<class _Dom> 112 void operator^=(const _Expr<_Dom, _Tp>&) const; 113 template<class _Dom> 114 void operator&=(const _Expr<_Dom, _Tp>&) const; 115 template<class _Dom> 116 void operator|=(const _Expr<_Dom, _Tp>&) const; 117 template<class _Dom> 118 void operator<<=(const _Expr<_Dom, _Tp>&) const; 119 template<class _Dom> 120 void operator>>=(const _Expr<_Dom, _Tp>&) const; 121 122 private: 123 _Array<_Tp> _M_array; 124 const valarray<size_t>& _M_index; 125 126 friend class valarray<_Tp>; 127 128 gslice_array(_Array<_Tp>, const valarray<size_t>&); 129 130 // not implemented 131 gslice_array(); 132 }; 133 134 template<typename _Tp> 135 inline 136 gslice_array<_Tp>::gslice_array(_Array<_Tp> __a, 137 const valarray<size_t>& __i) 138 : _M_array(__a), _M_index(__i) {} 139 140 template<typename _Tp> 141 inline 142 gslice_array<_Tp>::gslice_array(const gslice_array<_Tp>& __a) 143 : _M_array(__a._M_array), _M_index(__a._M_index) {} 144 145 template<typename _Tp> 146 inline gslice_array<_Tp>& 147 gslice_array<_Tp>::operator=(const gslice_array<_Tp>& __a) 148 { 149 std::__valarray_copy(_Array<_Tp>(__a._M_array), 150 _Array<size_t>(__a._M_index), _M_index.size(), 151 _M_array, _Array<size_t>(_M_index)); 152 return *this; 153 } 154 155 template<typename _Tp> 156 inline void 157 gslice_array<_Tp>::operator=(const _Tp& __t) const 158 { 159 std::__valarray_fill(_M_array, _Array<size_t>(_M_index), 160 _M_index.size(), __t); 161 } 162 163 template<typename _Tp> 164 inline void 165 gslice_array<_Tp>::operator=(const valarray<_Tp>& __v) const 166 { 167 std::__valarray_copy(_Array<_Tp>(__v), __v.size(), 168 _M_array, _Array<size_t>(_M_index)); 169 } 170 171 template<typename _Tp> 172 template<class _Dom> 173 inline void 174 gslice_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const 175 { 176 std::__valarray_copy (__e, _M_index.size(), _M_array, 177 _Array<size_t>(_M_index)); 178 } 179 180 #undef _DEFINE_VALARRAY_OPERATOR 181 #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ 182 template<typename _Tp> \ 183 inline void \ 184 gslice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ 185 { \ 186 _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), \ 187 _Array<_Tp>(__v), __v.size()); \ 188 } \ 189 \ 190 template<typename _Tp> \ 191 template<class _Dom> \ 192 inline void \ 193 gslice_array<_Tp>::operator _Op##= (const _Expr<_Dom, _Tp>& __e) const\ 194 { \ 195 _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), __e,\ 196 _M_index.size()); \ 197 } 198 199 _DEFINE_VALARRAY_OPERATOR(*, __multiplies) 200 _DEFINE_VALARRAY_OPERATOR(/, __divides) 201 _DEFINE_VALARRAY_OPERATOR(%, __modulus) 202 _DEFINE_VALARRAY_OPERATOR(+, __plus) 203 _DEFINE_VALARRAY_OPERATOR(-, __minus) 204 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) 205 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) 206 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) 207 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) 208 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) 209 210 #undef _DEFINE_VALARRAY_OPERATOR 211 212 // @} group numeric_arrays 213 214 _GLIBCXX_END_NAMESPACE 215 216 #endif /* _GSLICE_ARRAY_H */ 217
