1 // The template and inlines for the -*- C++ -*- gslice_array class. 2 3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2004, 2005, 2009, 2010 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 bits/gslice_array.h 27 * This is an internal header file, included by other library headers. 28 * Do not attempt to use it directly. @headername{valarray} 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 namespace std _GLIBCXX_VISIBILITY(default) 39 { 40 _GLIBCXX_BEGIN_NAMESPACE_VERSION 41 42 /** 43 * @addtogroup numeric_arrays 44 * @{ 45 */ 46 47 /** 48 * @brief Reference to multi-dimensional subset of an array. 49 * 50 * A gslice_array is a reference to the actual elements of an array 51 * specified by a gslice. The way to get a gslice_array is to call 52 * operator[](gslice) on a valarray. The returned gslice_array then 53 * permits carrying operations out on the referenced subset of elements in 54 * the original valarray. For example, operator+=(valarray) will add 55 * values to the subset of elements in the underlying valarray this 56 * gslice_array refers to. 57 * 58 * @param Tp Element type. 59 */ 60 template<typename _Tp> 61 class gslice_array 62 { 63 public: 64 typedef _Tp value_type; 65 66 // _GLIBCXX_RESOLVE_LIB_DEFECTS 67 // 253. valarray helper functions are almost entirely useless 68 69 /// Copy constructor. Both slices refer to the same underlying array. 70 gslice_array(const gslice_array&); 71 72 /// Assignment operator. Assigns slice elements to corresponding 73 /// elements of @a a. 74 gslice_array& operator=(const gslice_array&); 75 76 /// Assign slice elements to corresponding elements of @a v. 77 void operator=(const valarray<_Tp>&) const; 78 /// Multiply slice elements by corresponding elements of @a v. 79 void operator*=(const valarray<_Tp>&) const; 80 /// Divide slice elements by corresponding elements of @a v. 81 void operator/=(const valarray<_Tp>&) const; 82 /// Modulo slice elements by corresponding elements of @a v. 83 void operator%=(const valarray<_Tp>&) const; 84 /// Add corresponding elements of @a v to slice elements. 85 void operator+=(const valarray<_Tp>&) const; 86 /// Subtract corresponding elements of @a v from slice elements. 87 void operator-=(const valarray<_Tp>&) const; 88 /// Logical xor slice elements with corresponding elements of @a v. 89 void operator^=(const valarray<_Tp>&) const; 90 /// Logical and slice elements with corresponding elements of @a v. 91 void operator&=(const valarray<_Tp>&) const; 92 /// Logical or slice elements with corresponding elements of @a v. 93 void operator|=(const valarray<_Tp>&) const; 94 /// Left shift slice elements by corresponding elements of @a v. 95 void operator<<=(const valarray<_Tp>&) const; 96 /// Right shift slice elements by corresponding elements of @a v. 97 void operator>>=(const valarray<_Tp>&) const; 98 /// Assign all slice elements to @a t. 99 void operator=(const _Tp&) const; 100 101 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 template<class _Dom> 122 void operator>>=(const _Expr<_Dom, _Tp>&) const; 123 124 private: 125 _Array<_Tp> _M_array; 126 const valarray<size_t>& _M_index; 127 128 friend class valarray<_Tp>; 129 130 gslice_array(_Array<_Tp>, const valarray<size_t>&); 131 132 // not implemented 133 gslice_array(); 134 }; 135 136 template<typename _Tp> 137 inline 138 gslice_array<_Tp>::gslice_array(_Array<_Tp> __a, 139 const valarray<size_t>& __i) 140 : _M_array(__a), _M_index(__i) {} 141 142 template<typename _Tp> 143 inline 144 gslice_array<_Tp>::gslice_array(const gslice_array<_Tp>& __a) 145 : _M_array(__a._M_array), _M_index(__a._M_index) {} 146 147 template<typename _Tp> 148 inline gslice_array<_Tp>& 149 gslice_array<_Tp>::operator=(const gslice_array<_Tp>& __a) 150 { 151 std::__valarray_copy(_Array<_Tp>(__a._M_array), 152 _Array<size_t>(__a._M_index), _M_index.size(), 153 _M_array, _Array<size_t>(_M_index)); 154 return *this; 155 } 156 157 template<typename _Tp> 158 inline void 159 gslice_array<_Tp>::operator=(const _Tp& __t) const 160 { 161 std::__valarray_fill(_M_array, _Array<size_t>(_M_index), 162 _M_index.size(), __t); 163 } 164 165 template<typename _Tp> 166 inline void 167 gslice_array<_Tp>::operator=(const valarray<_Tp>& __v) const 168 { 169 std::__valarray_copy(_Array<_Tp>(__v), __v.size(), 170 _M_array, _Array<size_t>(_M_index)); 171 } 172 173 template<typename _Tp> 174 template<class _Dom> 175 inline void 176 gslice_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const 177 { 178 std::__valarray_copy (__e, _M_index.size(), _M_array, 179 _Array<size_t>(_M_index)); 180 } 181 182 #undef _DEFINE_VALARRAY_OPERATOR 183 #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ 184 template<typename _Tp> \ 185 inline void \ 186 gslice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ 187 { \ 188 _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), \ 189 _Array<_Tp>(__v), __v.size()); \ 190 } \ 191 \ 192 template<typename _Tp> \ 193 template<class _Dom> \ 194 inline void \ 195 gslice_array<_Tp>::operator _Op##= (const _Expr<_Dom, _Tp>& __e) const\ 196 { \ 197 _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), __e,\ 198 _M_index.size()); \ 199 } 200 201 _DEFINE_VALARRAY_OPERATOR(*, __multiplies) 202 _DEFINE_VALARRAY_OPERATOR(/, __divides) 203 _DEFINE_VALARRAY_OPERATOR(%, __modulus) 204 _DEFINE_VALARRAY_OPERATOR(+, __plus) 205 _DEFINE_VALARRAY_OPERATOR(-, __minus) 206 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) 207 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) 208 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) 209 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) 210 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) 211 212 #undef _DEFINE_VALARRAY_OPERATOR 213 214 // @} group numeric_arrays 215 216 _GLIBCXX_END_NAMESPACE_VERSION 217 } // namespace 218 219 #endif /* _GSLICE_ARRAY_H */ 220
