1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_ARRAY
11#define _LIBCPP_ARRAY
12
13/*
14 array synopsis
15
16namespace std
17{
18template <class T, size_t N >
19struct array
20{
21 // types:
22 typedef T & reference;
23 typedef const T & const_reference;
24 typedef implementation defined iterator;
25 typedef implementation defined const_iterator;
26 typedef size_t size_type;
27 typedef ptrdiff_t difference_type;
28 typedef T value_type;
29 typedef T* pointer;
30 typedef const T* const_pointer;
31 typedef std::reverse_iterator<iterator> reverse_iterator;
32 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
33
34 // No explicit construct/copy/destroy for aggregate type
35 void fill(const T& u); // constexpr in C++20
36 void swap(array& a) noexcept(is_nothrow_swappable_v<T>); // constexpr in C++20
37
38 // iterators:
39 iterator begin() noexcept; // constexpr in C++17
40 const_iterator begin() const noexcept; // constexpr in C++17
41 iterator end() noexcept; // constexpr in C++17
42 const_iterator end() const noexcept; // constexpr in C++17
43
44 reverse_iterator rbegin() noexcept; // constexpr in C++17
45 const_reverse_iterator rbegin() const noexcept; // constexpr in C++17
46 reverse_iterator rend() noexcept; // constexpr in C++17
47 const_reverse_iterator rend() const noexcept; // constexpr in C++17
48
49 const_iterator cbegin() const noexcept; // constexpr in C++17
50 const_iterator cend() const noexcept; // constexpr in C++17
51 const_reverse_iterator crbegin() const noexcept; // constexpr in C++17
52 const_reverse_iterator crend() const noexcept; // constexpr in C++17
53
54 // capacity:
55 constexpr size_type size() const noexcept;
56 constexpr size_type max_size() const noexcept;
57 constexpr bool empty() const noexcept;
58
59 // element access:
60 reference operator[](size_type n); // constexpr in C++17
61 const_reference operator[](size_type n) const; // constexpr in C++14
62 reference at(size_type n); // constexpr in C++17
63 const_reference at(size_type n) const; // constexpr in C++14
64
65 reference front(); // constexpr in C++17
66 const_reference front() const; // constexpr in C++14
67 reference back(); // constexpr in C++17
68 const_reference back() const; // constexpr in C++14
69
70 T* data() noexcept; // constexpr in C++17
71 const T* data() const noexcept; // constexpr in C++17
72};
73
74template <class T, class... U>
75 array(T, U...) -> array<T, 1 + sizeof...(U)>; // C++17
76
77template <class T, size_t N>
78 bool operator==(const array<T,N>& x, const array<T,N>& y); // constexpr in C++20
79template <class T, size_t N>
80 bool operator!=(const array<T,N>& x, const array<T,N>& y); // constexpr in C++20
81template <class T, size_t N>
82 bool operator<(const array<T,N>& x, const array<T,N>& y); // constexpr in C++20
83template <class T, size_t N>
84 bool operator>(const array<T,N>& x, const array<T,N>& y); // constexpr in C++20
85template <class T, size_t N>
86 bool operator<=(const array<T,N>& x, const array<T,N>& y); // constexpr in C++20
87template <class T, size_t N>
88 bool operator>=(const array<T,N>& x, const array<T,N>& y); // constexpr in C++20
89
90template <class T, size_t N >
91 void swap(array<T,N>& x, array<T,N>& y) noexcept(noexcept(x.swap(y))); // constexpr in C++20
92
93template <class T, size_t N>
94 constexpr array<remove_cv_t<T>, N> to_array(T (&a)[N]); // C++20
95template <class T, size_t N>
96 constexpr array<remove_cv_t<T>, N> to_array(T (&&a)[N]); // C++20
97
98template <class T> struct tuple_size;
99template <size_t I, class T> struct tuple_element;
100template <class T, size_t N> struct tuple_size<array<T, N>>;
101template <size_t I, class T, size_t N> struct tuple_element<I, array<T, N>>;
102template <size_t I, class T, size_t N> T& get(array<T, N>&) noexcept; // constexpr in C++14
103template <size_t I, class T, size_t N> const T& get(const array<T, N>&) noexcept; // constexpr in C++14
104template <size_t I, class T, size_t N> T&& get(array<T, N>&&) noexcept; // constexpr in C++14
105template <size_t I, class T, size_t N> const T&& get(const array<T, N>&&) noexcept; // constexpr in C++14
106
107} // std
108
109*/
110
111#include <__algorithm/equal.h>
112#include <__algorithm/fill_n.h>
113#include <__algorithm/lexicographical_compare.h>
114#include <__algorithm/swap_ranges.h>
115#include <__assert> // all public C++ headers provide the assertion handler
116#include <__config>
117#include <__iterator/reverse_iterator.h>
118#include <__tuple>
119#include <__utility/integer_sequence.h>
120#include <__utility/move.h>
121#include <__utility/unreachable.h>
122#include <stdexcept>
123#include <type_traits>
124#include <version>
125
126#ifndef _LIBCPP_REMOVE_TRANSITIVE_INCLUDES
127# include <algorithm>
128# include <iterator>
129# include <utility>
130#endif
131
132// standard-mandated includes
133
134// [iterator.range]
135#include <__iterator/access.h>
136#include <__iterator/data.h>
137#include <__iterator/empty.h>
138#include <__iterator/reverse_access.h>
139#include <__iterator/size.h>
140
141// [array.syn]
142#include <compare>
143#include <initializer_list>
144
145#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
146# pragma GCC system_header
147#endif
148
149_LIBCPP_BEGIN_NAMESPACE_STD
150
151template <class _Tp, size_t _Size>
152struct _LIBCPP_TEMPLATE_VIS array
153{
154 // types:
155 typedef array __self;
156 typedef _Tp value_type;
157 typedef value_type& reference;
158 typedef const value_type& const_reference;
159 typedef value_type* iterator;
160 typedef const value_type* const_iterator;
161 typedef value_type* pointer;
162 typedef const value_type* const_pointer;
163 typedef size_t size_type;
164 typedef ptrdiff_t difference_type;
165 typedef _VSTD::reverse_iterator<iterator> reverse_iterator;
166 typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;
167
168 _Tp __elems_[_Size];
169
170 // No explicit construct/copy/destroy for aggregate type
171 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
172 void fill(const value_type& __u) {
173 _VSTD::fill_n(data(), _Size, __u);
174 }
175
176 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
177 void swap(array& __a) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) {
178 _VSTD::swap_ranges(data(), data() + _Size, __a.data());
179 }
180
181 // iterators:
182 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
183 iterator begin() _NOEXCEPT {return iterator(data());}
184 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
185 const_iterator begin() const _NOEXCEPT {return const_iterator(data());}
186 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
187 iterator end() _NOEXCEPT {return iterator(data() + _Size);}
188 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
189 const_iterator end() const _NOEXCEPT {return const_iterator(data() + _Size);}
190
191 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
192 reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
193 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
194 const_reverse_iterator rbegin() const _NOEXCEPT {return const_reverse_iterator(end());}
195 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
196 reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
197 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
198 const_reverse_iterator rend() const _NOEXCEPT {return const_reverse_iterator(begin());}
199
200 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
201 const_iterator cbegin() const _NOEXCEPT {return begin();}
202 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
203 const_iterator cend() const _NOEXCEPT {return end();}
204 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
205 const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
206 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
207 const_reverse_iterator crend() const _NOEXCEPT {return rend();}
208
209 // capacity:
210 _LIBCPP_INLINE_VISIBILITY
211 _LIBCPP_CONSTEXPR size_type size() const _NOEXCEPT {return _Size;}
212 _LIBCPP_INLINE_VISIBILITY
213 _LIBCPP_CONSTEXPR size_type max_size() const _NOEXCEPT {return _Size;}
214 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
215 _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {return _Size == 0;}
216
217 // element access:
218 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
219 reference operator[](size_type __n) _NOEXCEPT {
220 _LIBCPP_ASSERT(__n < _Size, "out-of-bounds access in std::array<T, N>");
221 return __elems_[__n];
222 }
223 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
224 const_reference operator[](size_type __n) const _NOEXCEPT {
225 _LIBCPP_ASSERT(__n < _Size, "out-of-bounds access in std::array<T, N>");
226 return __elems_[__n];
227 }
228
229 _LIBCPP_CONSTEXPR_AFTER_CXX14 reference at(size_type __n)
230 {
231 if (__n >= _Size)
232 __throw_out_of_range(msg: "array::at");
233 return __elems_[__n];
234 }
235
236 _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference at(size_type __n) const
237 {
238 if (__n >= _Size)
239 __throw_out_of_range(msg: "array::at");
240 return __elems_[__n];
241 }
242
243 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 reference front() _NOEXCEPT {return (*this)[0];}
244 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference front() const _NOEXCEPT {return (*this)[0];}
245 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 reference back() _NOEXCEPT {return (*this)[_Size - 1];}
246 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference back() const _NOEXCEPT {return (*this)[_Size - 1];}
247
248 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
249 value_type* data() _NOEXCEPT {return __elems_;}
250 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
251 const value_type* data() const _NOEXCEPT {return __elems_;}
252};
253
254template <class _Tp>
255struct _LIBCPP_TEMPLATE_VIS array<_Tp, 0>
256{
257 // types:
258 typedef array __self;
259 typedef _Tp value_type;
260 typedef value_type& reference;
261 typedef const value_type& const_reference;
262 typedef value_type* iterator;
263 typedef const value_type* const_iterator;
264 typedef value_type* pointer;
265 typedef const value_type* const_pointer;
266 typedef size_t size_type;
267 typedef ptrdiff_t difference_type;
268 typedef _VSTD::reverse_iterator<iterator> reverse_iterator;
269 typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;
270
271 typedef typename conditional<is_const<_Tp>::value, const char,
272 char>::type _CharType;
273
274 struct _ArrayInStructT { _Tp __data_[1]; };
275 _ALIGNAS_TYPE(_ArrayInStructT) _CharType __elems_[sizeof(_ArrayInStructT)];
276
277 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
278 value_type* data() _NOEXCEPT {return nullptr;}
279 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
280 const value_type* data() const _NOEXCEPT {return nullptr;}
281
282 // No explicit construct/copy/destroy for aggregate type
283 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
284 void fill(const value_type&) {
285 static_assert(!is_const<_Tp>::value,
286 "cannot fill zero-sized array of type 'const T'");
287 }
288
289 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
290 void swap(array&) _NOEXCEPT {
291 static_assert(!is_const<_Tp>::value,
292 "cannot swap zero-sized array of type 'const T'");
293 }
294
295 // iterators:
296 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
297 iterator begin() _NOEXCEPT {return iterator(data());}
298 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
299 const_iterator begin() const _NOEXCEPT {return const_iterator(data());}
300 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
301 iterator end() _NOEXCEPT {return iterator(data());}
302 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
303 const_iterator end() const _NOEXCEPT {return const_iterator(data());}
304
305 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
306 reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
307 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
308 const_reverse_iterator rbegin() const _NOEXCEPT {return const_reverse_iterator(end());}
309 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
310 reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
311 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
312 const_reverse_iterator rend() const _NOEXCEPT {return const_reverse_iterator(begin());}
313
314 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
315 const_iterator cbegin() const _NOEXCEPT {return begin();}
316 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
317 const_iterator cend() const _NOEXCEPT {return end();}
318 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
319 const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
320 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
321 const_reverse_iterator crend() const _NOEXCEPT {return rend();}
322
323 // capacity:
324 _LIBCPP_INLINE_VISIBILITY
325 _LIBCPP_CONSTEXPR size_type size() const _NOEXCEPT {return 0; }
326 _LIBCPP_INLINE_VISIBILITY
327 _LIBCPP_CONSTEXPR size_type max_size() const _NOEXCEPT {return 0;}
328 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
329 _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {return true;}
330
331 // element access:
332 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
333 reference operator[](size_type) _NOEXCEPT {
334 _LIBCPP_ASSERT(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
335 __libcpp_unreachable();
336 }
337
338 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
339 const_reference operator[](size_type) const _NOEXCEPT {
340 _LIBCPP_ASSERT(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
341 __libcpp_unreachable();
342 }
343
344 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
345 reference at(size_type) {
346 __throw_out_of_range(msg: "array<T, 0>::at");
347 __libcpp_unreachable();
348 }
349
350 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
351 const_reference at(size_type) const {
352 __throw_out_of_range(msg: "array<T, 0>::at");
353 __libcpp_unreachable();
354 }
355
356 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
357 reference front() _NOEXCEPT {
358 _LIBCPP_ASSERT(false, "cannot call array<T, 0>::front() on a zero-sized array");
359 __libcpp_unreachable();
360 }
361
362 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
363 const_reference front() const _NOEXCEPT {
364 _LIBCPP_ASSERT(false, "cannot call array<T, 0>::front() on a zero-sized array");
365 __libcpp_unreachable();
366 }
367
368 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
369 reference back() _NOEXCEPT {
370 _LIBCPP_ASSERT(false, "cannot call array<T, 0>::back() on a zero-sized array");
371 __libcpp_unreachable();
372 }
373
374 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
375 const_reference back() const _NOEXCEPT {
376 _LIBCPP_ASSERT(false, "cannot call array<T, 0>::back() on a zero-sized array");
377 __libcpp_unreachable();
378 }
379};
380
381
382#if _LIBCPP_STD_VER > 14
383template<class _Tp, class... _Args,
384 class = enable_if_t<__all<_IsSame<_Tp, _Args>::value...>::value>
385 >
386array(_Tp, _Args...)
387 -> array<_Tp, 1 + sizeof...(_Args)>;
388#endif
389
390template <class _Tp, size_t _Size>
391inline _LIBCPP_INLINE_VISIBILITY
392_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
393operator==(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
394{
395 return _VSTD::equal(__x.begin(), __x.end(), __y.begin());
396}
397
398template <class _Tp, size_t _Size>
399inline _LIBCPP_INLINE_VISIBILITY
400_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
401operator!=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
402{
403 return !(__x == __y);
404}
405
406template <class _Tp, size_t _Size>
407inline _LIBCPP_INLINE_VISIBILITY
408_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
409operator<(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
410{
411 return _VSTD::lexicographical_compare(__x.begin(), __x.end(),
412 __y.begin(), __y.end());
413}
414
415template <class _Tp, size_t _Size>
416inline _LIBCPP_INLINE_VISIBILITY
417_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
418operator>(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
419{
420 return __y < __x;
421}
422
423template <class _Tp, size_t _Size>
424inline _LIBCPP_INLINE_VISIBILITY
425_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
426operator<=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
427{
428 return !(__y < __x);
429}
430
431template <class _Tp, size_t _Size>
432inline _LIBCPP_INLINE_VISIBILITY
433_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
434operator>=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
435{
436 return !(__x < __y);
437}
438
439template <class _Tp, size_t _Size>
440inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
441__enable_if_t<_Size == 0 || __is_swappable<_Tp>::value, void>
442swap(array<_Tp, _Size>& __x, array<_Tp, _Size>& __y)
443 _NOEXCEPT_(noexcept(__x.swap(__y)))
444{
445 __x.swap(__y);
446}
447
448template <class _Tp, size_t _Size>
449struct _LIBCPP_TEMPLATE_VIS tuple_size<array<_Tp, _Size> >
450 : public integral_constant<size_t, _Size> {};
451
452template <size_t _Ip, class _Tp, size_t _Size>
453struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, array<_Tp, _Size> >
454{
455 static_assert(_Ip < _Size, "Index out of bounds in std::tuple_element<> (std::array)");
456 typedef _Tp type;
457};
458
459template <size_t _Ip, class _Tp, size_t _Size>
460inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
461_Tp&
462get(array<_Tp, _Size>& __a) _NOEXCEPT
463{
464 static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array)");
465 return __a.__elems_[_Ip];
466}
467
468template <size_t _Ip, class _Tp, size_t _Size>
469inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
470const _Tp&
471get(const array<_Tp, _Size>& __a) _NOEXCEPT
472{
473 static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array)");
474 return __a.__elems_[_Ip];
475}
476
477template <size_t _Ip, class _Tp, size_t _Size>
478inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
479_Tp&&
480get(array<_Tp, _Size>&& __a) _NOEXCEPT
481{
482 static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array &&)");
483 return _VSTD::move(__a.__elems_[_Ip]);
484}
485
486template <size_t _Ip, class _Tp, size_t _Size>
487inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
488const _Tp&&
489get(const array<_Tp, _Size>&& __a) _NOEXCEPT
490{
491 static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array &&)");
492 return _VSTD::move(__a.__elems_[_Ip]);
493}
494
495#if _LIBCPP_STD_VER > 17
496
497template <typename _Tp, size_t _Size, size_t... _Index>
498_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
499__to_array_lvalue_impl(_Tp (&__arr)[_Size], index_sequence<_Index...>) {
500 return {{__arr[_Index]...}};
501}
502
503template <typename _Tp, size_t _Size, size_t... _Index>
504_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
505__to_array_rvalue_impl(_Tp(&&__arr)[_Size], index_sequence<_Index...>) {
506 return {{_VSTD::move(__arr[_Index])...}};
507}
508
509template <typename _Tp, size_t _Size>
510_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
511to_array(_Tp (&__arr)[_Size]) noexcept(is_nothrow_constructible_v<_Tp, _Tp&>) {
512 static_assert(
513 !is_array_v<_Tp>,
514 "[array.creation]/1: to_array does not accept multidimensional arrays.");
515 static_assert(
516 is_constructible_v<_Tp, _Tp&>,
517 "[array.creation]/1: to_array requires copy constructible elements.");
518 return _VSTD::__to_array_lvalue_impl(__arr, make_index_sequence<_Size>());
519}
520
521template <typename _Tp, size_t _Size>
522_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
523to_array(_Tp(&&__arr)[_Size]) noexcept(is_nothrow_move_constructible_v<_Tp>) {
524 static_assert(
525 !is_array_v<_Tp>,
526 "[array.creation]/4: to_array does not accept multidimensional arrays.");
527 static_assert(
528 is_move_constructible_v<_Tp>,
529 "[array.creation]/4: to_array requires move constructible elements.");
530 return _VSTD::__to_array_rvalue_impl(_VSTD::move(__arr),
531 make_index_sequence<_Size>());
532}
533
534#endif // _LIBCPP_STD_VER > 17
535
536_LIBCPP_END_NAMESPACE_STD
537
538#endif // _LIBCPP_ARRAY
539

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