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10b57cec5SDimitry Andric// -*- C++ -*-
20b57cec5SDimitry Andric//===---------------------------- array -----------------------------------===//
30b57cec5SDimitry Andric//
40b57cec5SDimitry Andric// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
50b57cec5SDimitry Andric// See https://llvm.org/LICENSE.txt for license information.
60b57cec5SDimitry Andric// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
70b57cec5SDimitry Andric//
80b57cec5SDimitry Andric//===----------------------------------------------------------------------===//
90b57cec5SDimitry Andric
100b57cec5SDimitry Andric#ifndef _LIBCPP_ARRAY
110b57cec5SDimitry Andric#define _LIBCPP_ARRAY
120b57cec5SDimitry Andric
130b57cec5SDimitry Andric/*
140b57cec5SDimitry Andric    array synopsis
150b57cec5SDimitry Andric
160b57cec5SDimitry Andricnamespace std
170b57cec5SDimitry Andric{
180b57cec5SDimitry Andrictemplate <class T, size_t N >
190b57cec5SDimitry Andricstruct array
200b57cec5SDimitry Andric{
210b57cec5SDimitry Andric    // types:
220b57cec5SDimitry Andric    typedef T & reference;
230b57cec5SDimitry Andric    typedef const T & const_reference;
240b57cec5SDimitry Andric    typedef implementation defined iterator;
250b57cec5SDimitry Andric    typedef implementation defined const_iterator;
260b57cec5SDimitry Andric    typedef size_t size_type;
270b57cec5SDimitry Andric    typedef ptrdiff_t difference_type;
280b57cec5SDimitry Andric    typedef T value_type;
290b57cec5SDimitry Andric    typedef T* pointer;
300b57cec5SDimitry Andric    typedef const T* const_pointer;
310b57cec5SDimitry Andric    typedef std::reverse_iterator<iterator> reverse_iterator;
320b57cec5SDimitry Andric    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
330b57cec5SDimitry Andric
340b57cec5SDimitry Andric    // No explicit construct/copy/destroy for aggregate type
35*5ffd83dbSDimitry Andric    void fill(const T& u);                                      // constexpr in C++20
36*5ffd83dbSDimitry Andric    void swap(array& a) noexcept(is_nothrow_swappable_v<T>);    // constexpr in C++20
370b57cec5SDimitry Andric
380b57cec5SDimitry Andric    // iterators:
39*5ffd83dbSDimitry Andric    iterator begin() noexcept;                                  // constexpr in C++17
40*5ffd83dbSDimitry Andric    const_iterator begin() const noexcept;                      // constexpr in C++17
41*5ffd83dbSDimitry Andric    iterator end() noexcept;                                    // constexpr in C++17
42*5ffd83dbSDimitry Andric    const_iterator end() const noexcept;                        // constexpr in C++17
430b57cec5SDimitry Andric
44*5ffd83dbSDimitry Andric    reverse_iterator rbegin() noexcept;                         // constexpr in C++17
45*5ffd83dbSDimitry Andric    const_reverse_iterator rbegin() const noexcept;             // constexpr in C++17
46*5ffd83dbSDimitry Andric    reverse_iterator rend() noexcept;                           // constexpr in C++17
47*5ffd83dbSDimitry Andric    const_reverse_iterator rend() const noexcept;               // constexpr in C++17
480b57cec5SDimitry Andric
49*5ffd83dbSDimitry Andric    const_iterator cbegin() const noexcept;                     // constexpr in C++17
50*5ffd83dbSDimitry Andric    const_iterator cend() const noexcept;                       // constexpr in C++17
51*5ffd83dbSDimitry Andric    const_reverse_iterator crbegin() const noexcept;            // constexpr in C++17
52*5ffd83dbSDimitry Andric    const_reverse_iterator crend() const noexcept;              // constexpr in C++17
530b57cec5SDimitry Andric
540b57cec5SDimitry Andric    // capacity:
550b57cec5SDimitry Andric    constexpr size_type size() const noexcept;
560b57cec5SDimitry Andric    constexpr size_type max_size() const noexcept;
570b57cec5SDimitry Andric    constexpr bool empty() const noexcept;
580b57cec5SDimitry Andric
590b57cec5SDimitry Andric    // element access:
60*5ffd83dbSDimitry Andric    reference operator[](size_type n);                          // constexpr in C++17
610b57cec5SDimitry Andric    const_reference operator[](size_type n) const;              // constexpr in C++14
62*5ffd83dbSDimitry Andric    reference at(size_type n);                                  // constexpr in C++17
630b57cec5SDimitry Andric    const_reference at(size_type n) const;                      // constexpr in C++14
640b57cec5SDimitry Andric
65*5ffd83dbSDimitry Andric    reference front();                                          // constexpr in C++17
660b57cec5SDimitry Andric    const_reference front() const;                              // constexpr in C++14
67*5ffd83dbSDimitry Andric    reference back();                                           // constexpr in C++17
680b57cec5SDimitry Andric    const_reference back() const;                               // constexpr in C++14
690b57cec5SDimitry Andric
70*5ffd83dbSDimitry Andric    T* data() noexcept;                                         // constexpr in C++17
71*5ffd83dbSDimitry Andric    const T* data() const noexcept;                             // constexpr in C++17
720b57cec5SDimitry Andric};
730b57cec5SDimitry Andric
740b57cec5SDimitry Andrictemplate <class T, class... U>
75*5ffd83dbSDimitry Andric  array(T, U...) -> array<T, 1 + sizeof...(U)>;                 // C++17
760b57cec5SDimitry Andric
770b57cec5SDimitry Andrictemplate <class T, size_t N>
78*5ffd83dbSDimitry Andric  bool operator==(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
790b57cec5SDimitry Andrictemplate <class T, size_t N>
80*5ffd83dbSDimitry Andric  bool operator!=(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
810b57cec5SDimitry Andrictemplate <class T, size_t N>
82*5ffd83dbSDimitry Andric  bool operator<(const array<T,N>& x, const array<T,N>& y);     // constexpr in C++20
830b57cec5SDimitry Andrictemplate <class T, size_t N>
84*5ffd83dbSDimitry Andric  bool operator>(const array<T,N>& x, const array<T,N>& y);     // constexpr in C++20
850b57cec5SDimitry Andrictemplate <class T, size_t N>
86*5ffd83dbSDimitry Andric  bool operator<=(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
870b57cec5SDimitry Andrictemplate <class T, size_t N>
88*5ffd83dbSDimitry Andric  bool operator>=(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
890b57cec5SDimitry Andric
900b57cec5SDimitry Andrictemplate <class T, size_t N >
91*5ffd83dbSDimitry Andric  void swap(array<T,N>& x, array<T,N>& y) noexcept(noexcept(x.swap(y))); // constexpr in C++20
92*5ffd83dbSDimitry Andric
93*5ffd83dbSDimitry Andrictemplate <class T, size_t N>
94*5ffd83dbSDimitry Andric  constexpr array<remove_cv_t<T>, N> to_array(T (&a)[N]);  // C++20
95*5ffd83dbSDimitry Andrictemplate <class T, size_t N>
96*5ffd83dbSDimitry Andric  constexpr array<remove_cv_t<T>, N> to_array(T (&&a)[N]); // C++20
970b57cec5SDimitry Andric
980b57cec5SDimitry Andrictemplate <class T> struct tuple_size;
990b57cec5SDimitry Andrictemplate <size_t I, class T> struct tuple_element;
1000b57cec5SDimitry Andrictemplate <class T, size_t N> struct tuple_size<array<T, N>>;
1010b57cec5SDimitry Andrictemplate <size_t I, class T, size_t N> struct tuple_element<I, array<T, N>>;
1020b57cec5SDimitry Andrictemplate <size_t I, class T, size_t N> T& get(array<T, N>&) noexcept;               // constexpr in C++14
1030b57cec5SDimitry Andrictemplate <size_t I, class T, size_t N> const T& get(const array<T, N>&) noexcept;   // constexpr in C++14
1040b57cec5SDimitry Andrictemplate <size_t I, class T, size_t N> T&& get(array<T, N>&&) noexcept;             // constexpr in C++14
1050b57cec5SDimitry Andrictemplate <size_t I, class T, size_t N> const T&& get(const array<T, N>&&) noexcept; // constexpr in C++14
1060b57cec5SDimitry Andric
1070b57cec5SDimitry Andric}  // std
1080b57cec5SDimitry Andric
1090b57cec5SDimitry Andric*/
1100b57cec5SDimitry Andric
1110b57cec5SDimitry Andric#include <__config>
1120b57cec5SDimitry Andric#include <__tuple>
1130b57cec5SDimitry Andric#include <type_traits>
1140b57cec5SDimitry Andric#include <utility>
1150b57cec5SDimitry Andric#include <iterator>
1160b57cec5SDimitry Andric#include <algorithm>
1170b57cec5SDimitry Andric#include <stdexcept>
1180b57cec5SDimitry Andric#include <cstdlib> // for _LIBCPP_UNREACHABLE
1190b57cec5SDimitry Andric#include <version>
1200b57cec5SDimitry Andric#include <__debug>
1210b57cec5SDimitry Andric
1220b57cec5SDimitry Andric#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
1230b57cec5SDimitry Andric#pragma GCC system_header
1240b57cec5SDimitry Andric#endif
1250b57cec5SDimitry Andric
1260b57cec5SDimitry Andric
1270b57cec5SDimitry Andric
1280b57cec5SDimitry Andric_LIBCPP_BEGIN_NAMESPACE_STD
1290b57cec5SDimitry Andric
1300b57cec5SDimitry Andric
1310b57cec5SDimitry Andrictemplate <class _Tp, size_t _Size>
1320b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS array
1330b57cec5SDimitry Andric{
1340b57cec5SDimitry Andric    // types:
1350b57cec5SDimitry Andric    typedef array __self;
1360b57cec5SDimitry Andric    typedef _Tp                                   value_type;
1370b57cec5SDimitry Andric    typedef value_type&                           reference;
1380b57cec5SDimitry Andric    typedef const value_type&                     const_reference;
1390b57cec5SDimitry Andric    typedef value_type*                           iterator;
1400b57cec5SDimitry Andric    typedef const value_type*                     const_iterator;
1410b57cec5SDimitry Andric    typedef value_type*                           pointer;
1420b57cec5SDimitry Andric    typedef const value_type*                     const_pointer;
1430b57cec5SDimitry Andric    typedef size_t                                size_type;
1440b57cec5SDimitry Andric    typedef ptrdiff_t                             difference_type;
1450b57cec5SDimitry Andric    typedef std::reverse_iterator<iterator>       reverse_iterator;
1460b57cec5SDimitry Andric    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
1470b57cec5SDimitry Andric
1480b57cec5SDimitry Andric    _Tp __elems_[_Size];
1490b57cec5SDimitry Andric
1500b57cec5SDimitry Andric    // No explicit construct/copy/destroy for aggregate type
151*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
152*5ffd83dbSDimitry Andric    void fill(const value_type& __u) {
153*5ffd83dbSDimitry Andric        _VSTD::fill_n(data(), _Size, __u);
1540b57cec5SDimitry Andric    }
1550b57cec5SDimitry Andric
156*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
1570b57cec5SDimitry Andric    void swap(array& __a) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) {
158*5ffd83dbSDimitry Andric        std::swap_ranges(data(), data() + _Size, __a.data());
1590b57cec5SDimitry Andric    }
1600b57cec5SDimitry Andric
1610b57cec5SDimitry Andric    // iterators:
1620b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1630b57cec5SDimitry Andric    iterator begin() _NOEXCEPT {return iterator(data());}
1640b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1650b57cec5SDimitry Andric    const_iterator begin() const _NOEXCEPT {return const_iterator(data());}
1660b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1670b57cec5SDimitry Andric    iterator end() _NOEXCEPT {return iterator(data() + _Size);}
1680b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1690b57cec5SDimitry Andric    const_iterator end() const _NOEXCEPT {return const_iterator(data() + _Size);}
1700b57cec5SDimitry Andric
1710b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1720b57cec5SDimitry Andric    reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
1730b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1740b57cec5SDimitry Andric    const_reverse_iterator rbegin() const _NOEXCEPT {return const_reverse_iterator(end());}
1750b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1760b57cec5SDimitry Andric    reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
1770b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1780b57cec5SDimitry Andric    const_reverse_iterator rend() const _NOEXCEPT {return const_reverse_iterator(begin());}
1790b57cec5SDimitry Andric
1800b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1810b57cec5SDimitry Andric    const_iterator cbegin() const _NOEXCEPT {return begin();}
1820b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1830b57cec5SDimitry Andric    const_iterator cend() const _NOEXCEPT {return end();}
1840b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1850b57cec5SDimitry Andric    const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
1860b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1870b57cec5SDimitry Andric    const_reverse_iterator crend() const _NOEXCEPT {return rend();}
1880b57cec5SDimitry Andric
1890b57cec5SDimitry Andric    // capacity:
1900b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY
1910b57cec5SDimitry Andric    _LIBCPP_CONSTEXPR size_type size() const _NOEXCEPT {return _Size;}
1920b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY
1930b57cec5SDimitry Andric    _LIBCPP_CONSTEXPR size_type max_size() const _NOEXCEPT {return _Size;}
1940b57cec5SDimitry Andric    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
195*5ffd83dbSDimitry Andric    _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {return _Size == 0;}
1960b57cec5SDimitry Andric
1970b57cec5SDimitry Andric    // element access:
1980b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
199*5ffd83dbSDimitry Andric    reference operator[](size_type __n) _NOEXCEPT {
200*5ffd83dbSDimitry Andric        _LIBCPP_ASSERT(__n < _Size, "out-of-bounds access in std::array<T, N>");
201*5ffd83dbSDimitry Andric        return __elems_[__n];
202*5ffd83dbSDimitry Andric    }
2030b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
204*5ffd83dbSDimitry Andric    const_reference operator[](size_type __n) const _NOEXCEPT {
205*5ffd83dbSDimitry Andric        _LIBCPP_ASSERT(__n < _Size, "out-of-bounds access in std::array<T, N>");
206*5ffd83dbSDimitry Andric        return __elems_[__n];
207*5ffd83dbSDimitry Andric    }
2080b57cec5SDimitry Andric
209*5ffd83dbSDimitry Andric    _LIBCPP_CONSTEXPR_AFTER_CXX14 reference at(size_type __n)
210*5ffd83dbSDimitry Andric    {
211*5ffd83dbSDimitry Andric        if (__n >= _Size)
212*5ffd83dbSDimitry Andric            __throw_out_of_range("array::at");
213*5ffd83dbSDimitry Andric        return __elems_[__n];
214*5ffd83dbSDimitry Andric    }
2150b57cec5SDimitry Andric
216*5ffd83dbSDimitry Andric    _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference at(size_type __n) const
217*5ffd83dbSDimitry Andric    {
218*5ffd83dbSDimitry Andric        if (__n >= _Size)
219*5ffd83dbSDimitry Andric            __throw_out_of_range("array::at");
220*5ffd83dbSDimitry Andric        return __elems_[__n];
221*5ffd83dbSDimitry Andric    }
222*5ffd83dbSDimitry Andric
223*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 reference front()             _NOEXCEPT {return (*this)[0];}
224*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference front() const _NOEXCEPT {return (*this)[0];}
225*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 reference back()              _NOEXCEPT {return (*this)[_Size - 1];}
226*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference back() const  _NOEXCEPT {return (*this)[_Size - 1];}
2270b57cec5SDimitry Andric
2280b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2290b57cec5SDimitry Andric    value_type* data() _NOEXCEPT {return __elems_;}
2300b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2310b57cec5SDimitry Andric    const value_type* data() const _NOEXCEPT {return __elems_;}
2320b57cec5SDimitry Andric};
2330b57cec5SDimitry Andric
2340b57cec5SDimitry Andrictemplate <class _Tp>
2350b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS array<_Tp, 0>
2360b57cec5SDimitry Andric{
2370b57cec5SDimitry Andric    // types:
2380b57cec5SDimitry Andric    typedef array __self;
2390b57cec5SDimitry Andric    typedef _Tp                                   value_type;
2400b57cec5SDimitry Andric    typedef value_type&                           reference;
2410b57cec5SDimitry Andric    typedef const value_type&                     const_reference;
2420b57cec5SDimitry Andric    typedef value_type*                           iterator;
2430b57cec5SDimitry Andric    typedef const value_type*                     const_iterator;
2440b57cec5SDimitry Andric    typedef value_type*                           pointer;
2450b57cec5SDimitry Andric    typedef const value_type*                     const_pointer;
2460b57cec5SDimitry Andric    typedef size_t                                size_type;
2470b57cec5SDimitry Andric    typedef ptrdiff_t                             difference_type;
2480b57cec5SDimitry Andric    typedef std::reverse_iterator<iterator>       reverse_iterator;
2490b57cec5SDimitry Andric    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
2500b57cec5SDimitry Andric
2510b57cec5SDimitry Andric    typedef typename conditional<is_const<_Tp>::value, const char,
2520b57cec5SDimitry Andric                                char>::type _CharType;
2530b57cec5SDimitry Andric
2540b57cec5SDimitry Andric    struct  _ArrayInStructT { _Tp __data_[1]; };
2550b57cec5SDimitry Andric    _ALIGNAS_TYPE(_ArrayInStructT) _CharType __elems_[sizeof(_ArrayInStructT)];
2560b57cec5SDimitry Andric
257*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
258*5ffd83dbSDimitry Andric    value_type* data() _NOEXCEPT {return nullptr;}
259*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
260*5ffd83dbSDimitry Andric    const value_type* data() const _NOEXCEPT {return nullptr;}
261*5ffd83dbSDimitry Andric
2620b57cec5SDimitry Andric    // No explicit construct/copy/destroy for aggregate type
263*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
264*5ffd83dbSDimitry Andric    void fill(const value_type&) {
2650b57cec5SDimitry Andric      static_assert(!is_const<_Tp>::value,
2660b57cec5SDimitry Andric                    "cannot fill zero-sized array of type 'const T'");
2670b57cec5SDimitry Andric    }
2680b57cec5SDimitry Andric
269*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
2700b57cec5SDimitry Andric    void swap(array&) _NOEXCEPT {
2710b57cec5SDimitry Andric      static_assert(!is_const<_Tp>::value,
2720b57cec5SDimitry Andric                    "cannot swap zero-sized array of type 'const T'");
2730b57cec5SDimitry Andric    }
2740b57cec5SDimitry Andric
2750b57cec5SDimitry Andric    // iterators:
276*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2770b57cec5SDimitry Andric    iterator begin() _NOEXCEPT {return iterator(data());}
278*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2790b57cec5SDimitry Andric    const_iterator begin() const _NOEXCEPT {return const_iterator(data());}
280*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2810b57cec5SDimitry Andric    iterator end() _NOEXCEPT {return iterator(data());}
282*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2830b57cec5SDimitry Andric    const_iterator end() const _NOEXCEPT {return const_iterator(data());}
2840b57cec5SDimitry Andric
285*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2860b57cec5SDimitry Andric    reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
287*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2880b57cec5SDimitry Andric    const_reverse_iterator rbegin() const _NOEXCEPT {return const_reverse_iterator(end());}
289*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2900b57cec5SDimitry Andric    reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
291*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2920b57cec5SDimitry Andric    const_reverse_iterator rend() const _NOEXCEPT {return const_reverse_iterator(begin());}
2930b57cec5SDimitry Andric
294*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2950b57cec5SDimitry Andric    const_iterator cbegin() const _NOEXCEPT {return begin();}
296*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2970b57cec5SDimitry Andric    const_iterator cend() const _NOEXCEPT {return end();}
298*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
2990b57cec5SDimitry Andric    const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
300*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
3010b57cec5SDimitry Andric    const_reverse_iterator crend() const _NOEXCEPT {return rend();}
3020b57cec5SDimitry Andric
3030b57cec5SDimitry Andric    // capacity:
3040b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY
3050b57cec5SDimitry Andric    _LIBCPP_CONSTEXPR size_type size() const _NOEXCEPT {return 0; }
3060b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY
3070b57cec5SDimitry Andric    _LIBCPP_CONSTEXPR size_type max_size() const _NOEXCEPT {return 0;}
3080b57cec5SDimitry Andric    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
3090b57cec5SDimitry Andric    _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {return true;}
3100b57cec5SDimitry Andric
3110b57cec5SDimitry Andric    // element access:
312*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
3130b57cec5SDimitry Andric    reference operator[](size_type) _NOEXCEPT {
3140b57cec5SDimitry Andric      _LIBCPP_ASSERT(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
3150b57cec5SDimitry Andric      _LIBCPP_UNREACHABLE();
3160b57cec5SDimitry Andric    }
3170b57cec5SDimitry Andric
3180b57cec5SDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
3190b57cec5SDimitry Andric    const_reference operator[](size_type) const _NOEXCEPT {
3200b57cec5SDimitry Andric      _LIBCPP_ASSERT(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
3210b57cec5SDimitry Andric      _LIBCPP_UNREACHABLE();
3220b57cec5SDimitry Andric    }
3230b57cec5SDimitry Andric
324*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
3250b57cec5SDimitry Andric    reference at(size_type) {
3260b57cec5SDimitry Andric      __throw_out_of_range("array<T, 0>::at");
3270b57cec5SDimitry Andric      _LIBCPP_UNREACHABLE();
3280b57cec5SDimitry Andric    }
3290b57cec5SDimitry Andric
330*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
3310b57cec5SDimitry Andric    const_reference at(size_type) const {
3320b57cec5SDimitry Andric      __throw_out_of_range("array<T, 0>::at");
3330b57cec5SDimitry Andric      _LIBCPP_UNREACHABLE();
3340b57cec5SDimitry Andric    }
3350b57cec5SDimitry Andric
336*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
3370b57cec5SDimitry Andric    reference front() _NOEXCEPT {
3380b57cec5SDimitry Andric      _LIBCPP_ASSERT(false, "cannot call array<T, 0>::front() on a zero-sized array");
3390b57cec5SDimitry Andric      _LIBCPP_UNREACHABLE();
3400b57cec5SDimitry Andric    }
3410b57cec5SDimitry Andric
342*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
3430b57cec5SDimitry Andric    const_reference front() const _NOEXCEPT {
3440b57cec5SDimitry Andric      _LIBCPP_ASSERT(false, "cannot call array<T, 0>::front() on a zero-sized array");
3450b57cec5SDimitry Andric      _LIBCPP_UNREACHABLE();
3460b57cec5SDimitry Andric    }
3470b57cec5SDimitry Andric
348*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
3490b57cec5SDimitry Andric    reference back() _NOEXCEPT {
3500b57cec5SDimitry Andric      _LIBCPP_ASSERT(false, "cannot call array<T, 0>::back() on a zero-sized array");
3510b57cec5SDimitry Andric      _LIBCPP_UNREACHABLE();
3520b57cec5SDimitry Andric    }
3530b57cec5SDimitry Andric
354*5ffd83dbSDimitry Andric    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
3550b57cec5SDimitry Andric    const_reference back() const _NOEXCEPT {
3560b57cec5SDimitry Andric      _LIBCPP_ASSERT(false, "cannot call array<T, 0>::back() on a zero-sized array");
3570b57cec5SDimitry Andric      _LIBCPP_UNREACHABLE();
3580b57cec5SDimitry Andric    }
3590b57cec5SDimitry Andric};
3600b57cec5SDimitry Andric
3610b57cec5SDimitry Andric
3620b57cec5SDimitry Andric#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
3630b57cec5SDimitry Andrictemplate<class _Tp, class... _Args,
36462cfcf62SDimitry Andric         class = _EnableIf<__all<_IsSame<_Tp, _Args>::value...>::value>
3650b57cec5SDimitry Andric         >
3660b57cec5SDimitry Andricarray(_Tp, _Args...)
3670b57cec5SDimitry Andric  -> array<_Tp, 1 + sizeof...(_Args)>;
3680b57cec5SDimitry Andric#endif
3690b57cec5SDimitry Andric
3700b57cec5SDimitry Andrictemplate <class _Tp, size_t _Size>
3710b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY
3720b57cec5SDimitry Andric_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
3730b57cec5SDimitry Andricoperator==(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
3740b57cec5SDimitry Andric{
3750b57cec5SDimitry Andric    return _VSTD::equal(__x.begin(), __x.end(), __y.begin());
3760b57cec5SDimitry Andric}
3770b57cec5SDimitry Andric
3780b57cec5SDimitry Andrictemplate <class _Tp, size_t _Size>
3790b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY
3800b57cec5SDimitry Andric_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
3810b57cec5SDimitry Andricoperator!=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
3820b57cec5SDimitry Andric{
3830b57cec5SDimitry Andric    return !(__x == __y);
3840b57cec5SDimitry Andric}
3850b57cec5SDimitry Andric
3860b57cec5SDimitry Andrictemplate <class _Tp, size_t _Size>
3870b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY
3880b57cec5SDimitry Andric_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
3890b57cec5SDimitry Andricoperator<(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
3900b57cec5SDimitry Andric{
3910b57cec5SDimitry Andric    return _VSTD::lexicographical_compare(__x.begin(), __x.end(),
3920b57cec5SDimitry Andric                                          __y.begin(), __y.end());
3930b57cec5SDimitry Andric}
3940b57cec5SDimitry Andric
3950b57cec5SDimitry Andrictemplate <class _Tp, size_t _Size>
3960b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY
3970b57cec5SDimitry Andric_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
3980b57cec5SDimitry Andricoperator>(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
3990b57cec5SDimitry Andric{
4000b57cec5SDimitry Andric    return __y < __x;
4010b57cec5SDimitry Andric}
4020b57cec5SDimitry Andric
4030b57cec5SDimitry Andrictemplate <class _Tp, size_t _Size>
4040b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY
4050b57cec5SDimitry Andric_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
4060b57cec5SDimitry Andricoperator<=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
4070b57cec5SDimitry Andric{
4080b57cec5SDimitry Andric    return !(__y < __x);
4090b57cec5SDimitry Andric}
4100b57cec5SDimitry Andric
4110b57cec5SDimitry Andrictemplate <class _Tp, size_t _Size>
4120b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY
4130b57cec5SDimitry Andric_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
4140b57cec5SDimitry Andricoperator>=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
4150b57cec5SDimitry Andric{
4160b57cec5SDimitry Andric    return !(__x < __y);
4170b57cec5SDimitry Andric}
4180b57cec5SDimitry Andric
4190b57cec5SDimitry Andrictemplate <class _Tp, size_t _Size>
420*5ffd83dbSDimitry Andricinline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
4210b57cec5SDimitry Andrictypename enable_if
4220b57cec5SDimitry Andric<
4230b57cec5SDimitry Andric    _Size == 0 ||
4240b57cec5SDimitry Andric    __is_swappable<_Tp>::value,
4250b57cec5SDimitry Andric    void
4260b57cec5SDimitry Andric>::type
4270b57cec5SDimitry Andricswap(array<_Tp, _Size>& __x, array<_Tp, _Size>& __y)
4280b57cec5SDimitry Andric                                  _NOEXCEPT_(noexcept(__x.swap(__y)))
4290b57cec5SDimitry Andric{
4300b57cec5SDimitry Andric    __x.swap(__y);
4310b57cec5SDimitry Andric}
4320b57cec5SDimitry Andric
4330b57cec5SDimitry Andrictemplate <class _Tp, size_t _Size>
4340b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS tuple_size<array<_Tp, _Size> >
4350b57cec5SDimitry Andric    : public integral_constant<size_t, _Size> {};
4360b57cec5SDimitry Andric
4370b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp, size_t _Size>
4380b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, array<_Tp, _Size> >
4390b57cec5SDimitry Andric{
4400b57cec5SDimitry Andric    static_assert(_Ip < _Size, "Index out of bounds in std::tuple_element<> (std::array)");
4410b57cec5SDimitry Andric    typedef _Tp type;
4420b57cec5SDimitry Andric};
4430b57cec5SDimitry Andric
4440b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp, size_t _Size>
4450b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
4460b57cec5SDimitry Andric_Tp&
4470b57cec5SDimitry Andricget(array<_Tp, _Size>& __a) _NOEXCEPT
4480b57cec5SDimitry Andric{
4490b57cec5SDimitry Andric    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array)");
4500b57cec5SDimitry Andric    return __a.__elems_[_Ip];
4510b57cec5SDimitry Andric}
4520b57cec5SDimitry Andric
4530b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp, size_t _Size>
4540b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
4550b57cec5SDimitry Andricconst _Tp&
4560b57cec5SDimitry Andricget(const array<_Tp, _Size>& __a) _NOEXCEPT
4570b57cec5SDimitry Andric{
4580b57cec5SDimitry Andric    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array)");
4590b57cec5SDimitry Andric    return __a.__elems_[_Ip];
4600b57cec5SDimitry Andric}
4610b57cec5SDimitry Andric
4620b57cec5SDimitry Andric#ifndef _LIBCPP_CXX03_LANG
4630b57cec5SDimitry Andric
4640b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp, size_t _Size>
4650b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
4660b57cec5SDimitry Andric_Tp&&
4670b57cec5SDimitry Andricget(array<_Tp, _Size>&& __a) _NOEXCEPT
4680b57cec5SDimitry Andric{
4690b57cec5SDimitry Andric    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array &&)");
4700b57cec5SDimitry Andric    return _VSTD::move(__a.__elems_[_Ip]);
4710b57cec5SDimitry Andric}
4720b57cec5SDimitry Andric
4730b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp, size_t _Size>
4740b57cec5SDimitry Andricinline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
4750b57cec5SDimitry Andricconst _Tp&&
4760b57cec5SDimitry Andricget(const array<_Tp, _Size>&& __a) _NOEXCEPT
4770b57cec5SDimitry Andric{
4780b57cec5SDimitry Andric    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array &&)");
4790b57cec5SDimitry Andric    return _VSTD::move(__a.__elems_[_Ip]);
4800b57cec5SDimitry Andric}
4810b57cec5SDimitry Andric
4820b57cec5SDimitry Andric#endif  // !_LIBCPP_CXX03_LANG
4830b57cec5SDimitry Andric
484*5ffd83dbSDimitry Andric#if _LIBCPP_STD_VER > 17
485*5ffd83dbSDimitry Andric
486*5ffd83dbSDimitry Andrictemplate <typename _Tp, size_t _Size, size_t... _Index>
487*5ffd83dbSDimitry Andric_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
488*5ffd83dbSDimitry Andric__to_array_lvalue_impl(_Tp (&__arr)[_Size], index_sequence<_Index...>) {
489*5ffd83dbSDimitry Andric  return {{__arr[_Index]...}};
490*5ffd83dbSDimitry Andric}
491*5ffd83dbSDimitry Andric
492*5ffd83dbSDimitry Andrictemplate <typename _Tp, size_t _Size, size_t... _Index>
493*5ffd83dbSDimitry Andric_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
494*5ffd83dbSDimitry Andric__to_array_rvalue_impl(_Tp(&&__arr)[_Size], index_sequence<_Index...>) {
495*5ffd83dbSDimitry Andric  return {{_VSTD::move(__arr[_Index])...}};
496*5ffd83dbSDimitry Andric}
497*5ffd83dbSDimitry Andric
498*5ffd83dbSDimitry Andrictemplate <typename _Tp, size_t _Size>
499*5ffd83dbSDimitry Andric_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
500*5ffd83dbSDimitry Andricto_array(_Tp (&__arr)[_Size]) noexcept(is_nothrow_constructible_v<_Tp, _Tp&>) {
501*5ffd83dbSDimitry Andric  static_assert(
502*5ffd83dbSDimitry Andric      !is_array_v<_Tp>,
503*5ffd83dbSDimitry Andric      "[array.creation]/1: to_array does not accept multidimensional arrays.");
504*5ffd83dbSDimitry Andric  static_assert(
505*5ffd83dbSDimitry Andric      is_constructible_v<_Tp, _Tp&>,
506*5ffd83dbSDimitry Andric      "[array.creation]/1: to_array requires copy constructible elements.");
507*5ffd83dbSDimitry Andric  return __to_array_lvalue_impl(__arr, make_index_sequence<_Size>());
508*5ffd83dbSDimitry Andric}
509*5ffd83dbSDimitry Andric
510*5ffd83dbSDimitry Andrictemplate <typename _Tp, size_t _Size>
511*5ffd83dbSDimitry Andric_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
512*5ffd83dbSDimitry Andricto_array(_Tp(&&__arr)[_Size]) noexcept(is_nothrow_move_constructible_v<_Tp>) {
513*5ffd83dbSDimitry Andric  static_assert(
514*5ffd83dbSDimitry Andric      !is_array_v<_Tp>,
515*5ffd83dbSDimitry Andric      "[array.creation]/4: to_array does not accept multidimensional arrays.");
516*5ffd83dbSDimitry Andric  static_assert(
517*5ffd83dbSDimitry Andric      is_move_constructible_v<_Tp>,
518*5ffd83dbSDimitry Andric      "[array.creation]/4: to_array requires move constructible elements.");
519*5ffd83dbSDimitry Andric  return __to_array_rvalue_impl(_VSTD::move(__arr),
520*5ffd83dbSDimitry Andric                                make_index_sequence<_Size>());
521*5ffd83dbSDimitry Andric}
522*5ffd83dbSDimitry Andric
523*5ffd83dbSDimitry Andric#endif // _LIBCPP_STD_VER > 17
524*5ffd83dbSDimitry Andric
5250b57cec5SDimitry Andric_LIBCPP_END_NAMESPACE_STD
5260b57cec5SDimitry Andric
5270b57cec5SDimitry Andric#endif  // _LIBCPP_ARRAY
528