1 // <array> -*- C++ -*- 2 3 // Copyright (C) 2007-2014 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 include/array 26 * This is a Standard C++ Library header. 27 */ 28 29 #ifndef _GLIBCXX_ARRAY 30 #define _GLIBCXX_ARRAY 1 31 32 #pragma GCC system_header 33 34 #if __cplusplus < 201103L 35 # include <bits/c++0x_warning.h> 36 #else 37 38 #include <stdexcept> 39 #include <bits/stl_algobase.h> 40 #include <bits/range_access.h> 41 42 namespace std _GLIBCXX_VISIBILITY(default) 43 { 44 _GLIBCXX_BEGIN_NAMESPACE_CONTAINER 45 46 template<typename _Tp, std::size_t _Nm> 47 struct __array_traits 48 { 49 typedef _Tp _Type[_Nm]; 50 51 static constexpr _Tp& 52 _S_ref(const _Type& __t, std::size_t __n) noexcept 53 { return const_cast<_Tp&>(__t[__n]); } 54 }; 55 56 template<typename _Tp> 57 struct __array_traits<_Tp, 0> 58 { 59 struct _Type { }; 60 61 static constexpr _Tp& 62 _S_ref(const _Type&, std::size_t) noexcept 63 { return *static_cast<_Tp*>(nullptr); } 64 }; 65 66 /** 67 * @brief A standard container for storing a fixed size sequence of elements. 68 * 69 * @ingroup sequences 70 * 71 * Meets the requirements of a <a href="tables.html#65">container</a>, a 72 * <a href="tables.html#66">reversible container</a>, and a 73 * <a href="tables.html#67">sequence</a>. 74 * 75 * Sets support random access iterators. 76 * 77 * @tparam Tp Type of element. Required to be a complete type. 78 * @tparam N Number of elements. 79 */ 80 template<typename _Tp, std::size_t _Nm> 81 struct array 82 { 83 typedef _Tp value_type; 84 typedef value_type* pointer; 85 typedef const value_type* const_pointer; 86 typedef value_type& reference; 87 typedef const value_type& const_reference; 88 typedef value_type* iterator; 89 typedef const value_type* const_iterator; 90 typedef std::size_t size_type; 91 typedef std::ptrdiff_t difference_type; 92 typedef std::reverse_iterator<iterator> reverse_iterator; 93 typedef std::reverse_iterator<const_iterator> const_reverse_iterator; 94 95 // Support for zero-sized arrays mandatory. 96 typedef _GLIBCXX_STD_C::__array_traits<_Tp, _Nm> _AT_Type; 97 typename _AT_Type::_Type _M_elems; 98 99 // No explicit construct/copy/destroy for aggregate type. 100 101 // DR 776. 102 void 103 fill(const value_type& __u) 104 { std::fill_n(begin(), size(), __u); } 105 106 void 107 swap(array& __other) 108 noexcept(noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))) 109 { std::swap_ranges(begin(), end(), __other.begin()); } 110 111 // Iterators. 112 iterator 113 begin() noexcept 114 { return iterator(data()); } 115 116 const_iterator 117 begin() const noexcept 118 { return const_iterator(data()); } 119 120 iterator 121 end() noexcept 122 { return iterator(data() + _Nm); } 123 124 const_iterator 125 end() const noexcept 126 { return const_iterator(data() + _Nm); } 127 128 reverse_iterator 129 rbegin() noexcept 130 { return reverse_iterator(end()); } 131 132 const_reverse_iterator 133 rbegin() const noexcept 134 { return const_reverse_iterator(end()); } 135 136 reverse_iterator 137 rend() noexcept 138 { return reverse_iterator(begin()); } 139 140 const_reverse_iterator 141 rend() const noexcept 142 { return const_reverse_iterator(begin()); } 143 144 const_iterator 145 cbegin() const noexcept 146 { return const_iterator(data()); } 147 148 const_iterator 149 cend() const noexcept 150 { return const_iterator(data() + _Nm); } 151 152 const_reverse_iterator 153 crbegin() const noexcept 154 { return const_reverse_iterator(end()); } 155 156 const_reverse_iterator 157 crend() const noexcept 158 { return const_reverse_iterator(begin()); } 159 160 // Capacity. 161 constexpr size_type 162 size() const noexcept { return _Nm; } 163 164 constexpr size_type 165 max_size() const noexcept { return _Nm; } 166 167 constexpr bool 168 empty() const noexcept { return size() == 0; } 169 170 // Element access. 171 reference 172 operator[](size_type __n) noexcept 173 { return _AT_Type::_S_ref(_M_elems, __n); } 174 175 constexpr const_reference 176 operator[](size_type __n) const noexcept 177 { return _AT_Type::_S_ref(_M_elems, __n); } 178 179 reference 180 at(size_type __n) 181 { 182 if (__n >= _Nm) 183 std::__throw_out_of_range_fmt(__N("array::at: __n (which is %zu) " 184 ">= _Nm (which is %zu)"), 185 __n, _Nm); 186 return _AT_Type::_S_ref(_M_elems, __n); 187 } 188 189 constexpr const_reference 190 at(size_type __n) const 191 { 192 // Result of conditional expression must be an lvalue so use 193 // boolean ? lvalue : (throw-expr, lvalue) 194 return __n < _Nm ? _AT_Type::_S_ref(_M_elems, __n) 195 : (std::__throw_out_of_range_fmt(__N("array::at: __n (which is %zu) " 196 ">= _Nm (which is %zu)"), 197 __n, _Nm), 198 _AT_Type::_S_ref(_M_elems, 0)); 199 } 200 201 reference 202 front() noexcept 203 { return *begin(); } 204 205 constexpr const_reference 206 front() const noexcept 207 { return _AT_Type::_S_ref(_M_elems, 0); } 208 209 reference 210 back() noexcept 211 { return _Nm ? *(end() - 1) : *end(); } 212 213 constexpr const_reference 214 back() const noexcept 215 { 216 return _Nm ? _AT_Type::_S_ref(_M_elems, _Nm - 1) 217 : _AT_Type::_S_ref(_M_elems, 0); 218 } 219 220 pointer 221 data() noexcept 222 { return std::__addressof(_AT_Type::_S_ref(_M_elems, 0)); } 223 224 const_pointer 225 data() const noexcept 226 { return std::__addressof(_AT_Type::_S_ref(_M_elems, 0)); } 227 }; 228 229 // Array comparisons. 230 template<typename _Tp, std::size_t _Nm> 231 inline bool 232 operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) 233 { return std::equal(__one.begin(), __one.end(), __two.begin()); } 234 235 template<typename _Tp, std::size_t _Nm> 236 inline bool 237 operator!=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) 238 { return !(__one == __two); } 239 240 template<typename _Tp, std::size_t _Nm> 241 inline bool 242 operator<(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b) 243 { 244 return std::lexicographical_compare(__a.begin(), __a.end(), 245 __b.begin(), __b.end()); 246 } 247 248 template<typename _Tp, std::size_t _Nm> 249 inline bool 250 operator>(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) 251 { return __two < __one; } 252 253 template<typename _Tp, std::size_t _Nm> 254 inline bool 255 operator<=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) 256 { return !(__one > __two); } 257 258 template<typename _Tp, std::size_t _Nm> 259 inline bool 260 operator>=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) 261 { return !(__one < __two); } 262 263 // Specialized algorithms. 264 template<typename _Tp, std::size_t _Nm> 265 inline void 266 swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two) 267 noexcept(noexcept(__one.swap(__two))) 268 { __one.swap(__two); } 269 270 template<std::size_t _Int, typename _Tp, std::size_t _Nm> 271 constexpr _Tp& 272 get(array<_Tp, _Nm>& __arr) noexcept 273 { 274 static_assert(_Int < _Nm, "index is out of bounds"); 275 return _GLIBCXX_STD_C::__array_traits<_Tp, _Nm>:: 276 _S_ref(__arr._M_elems, _Int); 277 } 278 279 template<std::size_t _Int, typename _Tp, std::size_t _Nm> 280 constexpr _Tp&& 281 get(array<_Tp, _Nm>&& __arr) noexcept 282 { 283 static_assert(_Int < _Nm, "index is out of bounds"); 284 return std::move(get<_Int>(__arr)); 285 } 286 287 template<std::size_t _Int, typename _Tp, std::size_t _Nm> 288 constexpr const _Tp& 289 get(const array<_Tp, _Nm>& __arr) noexcept 290 { 291 static_assert(_Int < _Nm, "index is out of bounds"); 292 return _GLIBCXX_STD_C::__array_traits<_Tp, _Nm>:: 293 _S_ref(__arr._M_elems, _Int); 294 } 295 296 _GLIBCXX_END_NAMESPACE_CONTAINER 297 } // namespace std 298 299 namespace std _GLIBCXX_VISIBILITY(default) 300 { 301 _GLIBCXX_BEGIN_NAMESPACE_VERSION 302 303 // Tuple interface to class template array. 304 305 /// tuple_size 306 template<typename _Tp> 307 class tuple_size; 308 309 template<typename _Tp, std::size_t _Nm> 310 struct tuple_size<_GLIBCXX_STD_C::array<_Tp, _Nm>> 311 : public integral_constant<std::size_t, _Nm> { }; 312 313 /// tuple_element 314 template<std::size_t _Int, typename _Tp> 315 class tuple_element; 316 317 template<std::size_t _Int, typename _Tp, std::size_t _Nm> 318 struct tuple_element<_Int, _GLIBCXX_STD_C::array<_Tp, _Nm>> 319 { 320 static_assert(_Int < _Nm, "index is out of bounds"); 321 typedef _Tp type; 322 }; 323 324 _GLIBCXX_END_NAMESPACE_VERSION 325 } // namespace std 326 327 #ifdef _GLIBCXX_DEBUG 328 # include <debug/array> 329 #endif 330 331 #ifdef _GLIBCXX_PROFILE 332 # include <profile/array> 333 #endif 334 335 #endif // C++11 336 337 #endif // _GLIBCXX_ARRAY 338
