Where Online Learning is simpler!
The C and C++ Include Header Files
/usr/include/c++/13/bits/slice_array.h
$ cat -n /usr/include/c++/13/bits/slice_array.h 1 // The template and inlines for the -*- C++ -*- slice_array class. 2 3 // Copyright (C) 1997-2023 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file bits/slice_array.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{valarray} 28 */ 29 30 // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr> 31 32 #ifndef _SLICE_ARRAY_H 33 #define _SLICE_ARRAY_H 1 34 35 #pragma GCC system_header 36 37 namespace std _GLIBCXX_VISIBILITY(default) 38 { 39 _GLIBCXX_BEGIN_NAMESPACE_VERSION 40 41 /** 42 * @addtogroup numeric_arrays 43 * @{ 44 */ 45 46 /** 47 * @brief Class defining one-dimensional subset of an array. 48 * 49 * The slice class represents a one-dimensional subset of an array, 50 * specified by three parameters: start offset, size, and stride. The 51 * start offset is the index of the first element of the array that is part 52 * of the subset. The size is the total number of elements in the subset. 53 * Stride is the distance between each successive array element to include 54 * in the subset. 55 * 56 * For example, with an array of size 10, and a slice with offset 1, size 3 57 * and stride 2, the subset consists of array elements 1, 3, and 5. 58 */ 59 class slice 60 { 61 public: 62 /// Construct an empty slice. 63 slice(); 64 65 /** 66 * @brief Construct a slice. 67 * 68 * @param __o Offset in array of first element. 69 * @param __d Number of elements in slice. 70 * @param __s Stride between array elements. 71 */ 72 slice(size_t __o, size_t __d, size_t __s); 73 74 /// Return array offset of first slice element. 75 size_t start() const; 76 /// Return size of slice. 77 size_t size() const; 78 /// Return array stride of slice. 79 size_t stride() const; 80 81 #if __cpp_impl_three_way_comparison >= 201907L 82 /// Equality comparison 83 friend bool operator==(const slice&, const slice&) = default; 84 #endif 85 86 private: 87 size_t _M_off; // offset 88 size_t _M_sz; // size 89 size_t _M_st; // stride unit 90 }; 91 92 // _GLIBCXX_RESOLVE_LIB_DEFECTS 93 // 543. valarray slice default constructor 94 inline 95 slice::slice() 96 : _M_off(0), _M_sz(0), _M_st(0) {} 97 98 inline 99 slice::slice(size_t __o, size_t __d, size_t __s) 100 : _M_off(__o), _M_sz(__d), _M_st(__s) {} 101 102 inline size_t 103 slice::start() const 104 { return _M_off; } 105 106 inline size_t 107 slice::size() const 108 { return _M_sz; } 109 110 inline size_t 111 slice::stride() const 112 { return _M_st; } 113 114 /** 115 * @brief Reference to one-dimensional subset of an array. 116 * 117 * A slice_array is a reference to the actual elements of an array 118 * specified by a slice. The way to get a slice_array is to call 119 * operator[](slice) on a valarray. The returned slice_array then permits 120 * carrying operations out on the referenced subset of elements in the 121 * original valarray. For example, operator+=(valarray) will add values 122 * to the subset of elements in the underlying valarray this slice_array 123 * refers to. 124 * 125 * @param Tp Element type. 126 */ 127 template<typename _Tp> 128 class slice_array 129 { 130 public: 131 typedef _Tp value_type; 132 133 // _GLIBCXX_RESOLVE_LIB_DEFECTS 134 // 253. valarray helper functions are almost entirely useless 135 136 /// Copy constructor. Both slices refer to the same underlying array. 137 slice_array(const slice_array&); 138 139 /// Assignment operator. Assigns slice elements to corresponding 140 /// elements of @a a. 141 slice_array& operator=(const slice_array&); 142 143 /// Assign slice elements to corresponding elements of @a v. 144 void operator=(const valarray<_Tp>&) const; 145 /// Multiply slice elements by corresponding elements of @a v. 146 void operator*=(const valarray<_Tp>&) const; 147 /// Divide slice elements by corresponding elements of @a v. 148 void operator/=(const valarray<_Tp>&) const; 149 /// Modulo slice elements by corresponding elements of @a v. 150 void operator%=(const valarray<_Tp>&) const; 151 /// Add corresponding elements of @a v to slice elements. 152 void operator+=(const valarray<_Tp>&) const; 153 /// Subtract corresponding elements of @a v from slice elements. 154 void operator-=(const valarray<_Tp>&) const; 155 /// Logical xor slice elements with corresponding elements of @a v. 156 void operator^=(const valarray<_Tp>&) const; 157 /// Logical and slice elements with corresponding elements of @a v. 158 void operator&=(const valarray<_Tp>&) const; 159 /// Logical or slice elements with corresponding elements of @a v. 160 void operator|=(const valarray<_Tp>&) const; 161 /// Left shift slice elements by corresponding elements of @a v. 162 void operator<<=(const valarray<_Tp>&) const; 163 /// Right shift slice elements by corresponding elements of @a v. 164 void operator>>=(const valarray<_Tp>&) const; 165 /// Assign all slice elements to @a t. 166 void operator=(const _Tp &) const; 167 // ~slice_array (); 168 169 template<class _Dom> 170 void operator=(const _Expr<_Dom, _Tp>&) const; 171 template<class _Dom> 172 void operator*=(const _Expr<_Dom, _Tp>&) const; 173 template<class _Dom> 174 void operator/=(const _Expr<_Dom, _Tp>&) const; 175 template<class _Dom> 176 void operator%=(const _Expr<_Dom, _Tp>&) const; 177 template<class _Dom> 178 void operator+=(const _Expr<_Dom, _Tp>&) const; 179 template<class _Dom> 180 void operator-=(const _Expr<_Dom, _Tp>&) const; 181 template<class _Dom> 182 void operator^=(const _Expr<_Dom, _Tp>&) const; 183 template<class _Dom> 184 void operator&=(const _Expr<_Dom, _Tp>&) const; 185 template<class _Dom> 186 void operator|=(const _Expr<_Dom, _Tp>&) const; 187 template<class _Dom> 188 void operator<<=(const _Expr<_Dom, _Tp>&) const; 189 template<class _Dom> 190 void operator>>=(const _Expr<_Dom, _Tp>&) const; 191 192 private: 193 friend class valarray<_Tp>; 194 slice_array(_Array<_Tp>, const slice&); 195 196 const size_t _M_sz; 197 const size_t _M_stride; 198 const _Array<_Tp> _M_array; 199 200 #if __cplusplus < 201103L 201 // not implemented 202 slice_array(); 203 #else 204 public: 205 slice_array() = delete; 206 #endif 207 }; 208 209 template<typename _Tp> 210 inline 211 slice_array<_Tp>::slice_array(_Array<_Tp> __a, const slice& __s) 212 : _M_sz(__s.size()), _M_stride(__s.stride()), 213 _M_array(__a.begin() + __s.start()) {} 214 215 template<typename _Tp> 216 inline 217 slice_array<_Tp>::slice_array(const slice_array<_Tp>& __a) 218 : _M_sz(__a._M_sz), _M_stride(__a._M_stride), _M_array(__a._M_array) {} 219 220 // template<typename _Tp> 221 // inline slice_array<_Tp>::~slice_array () {} 222 223 template<typename _Tp> 224 inline slice_array<_Tp>& 225 slice_array<_Tp>::operator=(const slice_array<_Tp>& __a) 226 { 227 std::__valarray_copy(__a._M_array, __a._M_sz, __a._M_stride, 228 _M_array, _M_stride); 229 return *this; 230 } 231 232 template<typename _Tp> 233 inline void 234 slice_array<_Tp>::operator=(const _Tp& __t) const 235 { std::__valarray_fill(_M_array, _M_sz, _M_stride, __t); } 236 237 template<typename _Tp> 238 inline void 239 slice_array<_Tp>::operator=(const valarray<_Tp>& __v) const 240 { std::__valarray_copy(_Array<_Tp>(__v), _M_array, _M_sz, _M_stride); } 241 242 template<typename _Tp> 243 template<class _Dom> 244 inline void 245 slice_array<_Tp>::operator=(const _Expr<_Dom,_Tp>& __e) const 246 { std::__valarray_copy(__e, _M_sz, _M_array, _M_stride); } 247 248 /// @cond undocumented 249 #undef _DEFINE_VALARRAY_OPERATOR 250 #define _DEFINE_VALARRAY_OPERATOR(_Op,_Name) \ 251 template<typename _Tp> \ 252 inline void \ 253 slice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ 254 { \ 255 _Array_augmented_##_Name(_M_array, _M_sz, _M_stride, _Array<_Tp>(__v));\ 256 } \ 257 \ 258 template<typename _Tp> \ 259 template<class _Dom> \ 260 inline void \ 261 slice_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\ 262 { \ 263 _Array_augmented_##_Name(_M_array, _M_stride, __e, _M_sz); \ 264 } 265 266 267 _DEFINE_VALARRAY_OPERATOR(*, __multiplies) 268 _DEFINE_VALARRAY_OPERATOR(/, __divides) 269 _DEFINE_VALARRAY_OPERATOR(%, __modulus) 270 _DEFINE_VALARRAY_OPERATOR(+, __plus) 271 _DEFINE_VALARRAY_OPERATOR(-, __minus) 272 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) 273 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) 274 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) 275 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) 276 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) 277 278 #undef _DEFINE_VALARRAY_OPERATOR 279 /// @endcond 280 281 /// @} group numeric_arrays 282 283 _GLIBCXX_END_NAMESPACE_VERSION 284 } // namespace 285 286 #endif /* _SLICE_ARRAY_H */
Contact us
|
About us
|
Term of use
|
Copyright © 2000-2025 MyWebUniversity.com ™
