// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___CXX03_ARRAY
#define _LIBCPP___CXX03_ARRAY

/*
    array synopsis

namespace std
{
template <class T, size_t N >
struct array
{
    // types:
    typedef T & reference;
    typedef const T & const_reference;
    typedef implementation defined iterator;
    typedef implementation defined const_iterator;
    typedef size_t size_type;
    typedef ptrdiff_t difference_type;
    typedef T value_type;
    typedef T* pointer;
    typedef const T* const_pointer;
    typedef std::reverse_iterator<iterator> reverse_iterator;
    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

    // No explicit construct/copy/destroy for aggregate type
    void fill(const T& u);                                      // constexpr in C++20
    void swap(array& a) noexcept(is_nothrow_swappable_v<T>);    // constexpr in C++20

    // iterators:
    iterator begin() noexcept;                                  // constexpr in C++17
    const_iterator begin() const noexcept;                      // constexpr in C++17
    iterator end() noexcept;                                    // constexpr in C++17
    const_iterator end() const noexcept;                        // constexpr in C++17

    reverse_iterator rbegin() noexcept;                         // constexpr in C++17
    const_reverse_iterator rbegin() const noexcept;             // constexpr in C++17
    reverse_iterator rend() noexcept;                           // constexpr in C++17
    const_reverse_iterator rend() const noexcept;               // constexpr in C++17

    const_iterator cbegin() const noexcept;                     // constexpr in C++17
    const_iterator cend() const noexcept;                       // constexpr in C++17
    const_reverse_iterator crbegin() const noexcept;            // constexpr in C++17
    const_reverse_iterator crend() const noexcept;              // constexpr in C++17

    // capacity:
    constexpr size_type size() const noexcept;
    constexpr size_type max_size() const noexcept;
    constexpr bool empty() const noexcept;

    // element access:
    reference operator[](size_type n);                          // constexpr in C++17
    const_reference operator[](size_type n) const;              // constexpr in C++14
    reference at(size_type n);                                  // constexpr in C++17
    const_reference at(size_type n) const;                      // constexpr in C++14

    reference front();                                          // constexpr in C++17
    const_reference front() const;                              // constexpr in C++14
    reference back();                                           // constexpr in C++17
    const_reference back() const;                               // constexpr in C++14

    T* data() noexcept;                                         // constexpr in C++17
    const T* data() const noexcept;                             // constexpr in C++17
};

template <class T, class... U>
  array(T, U...) -> array<T, 1 + sizeof...(U)>;                 // C++17

template <class T, size_t N>
  bool operator==(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
template <class T, size_t N>
  bool operator!=(const array<T,N>& x, const array<T,N>& y);    // removed in C++20
template <class T, size_t N>
  bool operator<(const array<T,N>& x, const array<T,N>& y);     // removed in C++20
template <class T, size_t N>
  bool operator>(const array<T,N>& x, const array<T,N>& y);     // removed in C++20
template <class T, size_t N>
  bool operator<=(const array<T,N>& x, const array<T,N>& y);    // removed in C++20
template <class T, size_t N>
  bool operator>=(const array<T,N>& x, const array<T,N>& y);    // removed in C++20
template<class T, size_t N>
  constexpr synth-three-way-result<T>
    operator<=>(const array<T, N>& x, const array<T, N>& y);    // since C++20

template <class T, size_t N >
  void swap(array<T,N>& x, array<T,N>& y) noexcept(noexcept(x.swap(y))); // constexpr in C++20

template <class T, size_t N>
  constexpr array<remove_cv_t<T>, N> to_array(T (&a)[N]);  // C++20
template <class T, size_t N>
  constexpr array<remove_cv_t<T>, N> to_array(T (&&a)[N]); // C++20

template <class T> struct tuple_size;
template <size_t I, class T> struct tuple_element;
template <class T, size_t N> struct tuple_size<array<T, N>>;
template <size_t I, class T, size_t N> struct tuple_element<I, array<T, N>>;
template <size_t I, class T, size_t N> T& get(array<T, N>&) noexcept;               // constexpr in C++14
template <size_t I, class T, size_t N> const T& get(const array<T, N>&) noexcept;   // constexpr in C++14
template <size_t I, class T, size_t N> T&& get(array<T, N>&&) noexcept;             // constexpr in C++14
template <size_t I, class T, size_t N> const T&& get(const array<T, N>&&) noexcept; // constexpr in C++14

}  // std

*/

#include <__cxx03/__algorithm/equal.h>
#include <__cxx03/__algorithm/fill_n.h>
#include <__cxx03/__algorithm/lexicographical_compare.h>
#include <__cxx03/__algorithm/swap_ranges.h>
#include <__cxx03/__assert>
#include <__cxx03/__config>
#include <__cxx03/__fwd/array.h>
#include <__cxx03/__iterator/reverse_iterator.h>
#include <__cxx03/__iterator/wrap_iter.h>
#include <__cxx03/__tuple/sfinae_helpers.h>
#include <__cxx03/__type_traits/conditional.h>
#include <__cxx03/__type_traits/conjunction.h>
#include <__cxx03/__type_traits/is_array.h>
#include <__cxx03/__type_traits/is_const.h>
#include <__cxx03/__type_traits/is_constructible.h>
#include <__cxx03/__type_traits/is_nothrow_constructible.h>
#include <__cxx03/__type_traits/is_same.h>
#include <__cxx03/__type_traits/is_swappable.h>
#include <__cxx03/__type_traits/is_trivially_relocatable.h>
#include <__cxx03/__type_traits/remove_cv.h>
#include <__cxx03/__utility/empty.h>
#include <__cxx03/__utility/integer_sequence.h>
#include <__cxx03/__utility/move.h>
#include <__cxx03/__utility/unreachable.h>
#include <__cxx03/stdexcept>
#include <__cxx03/version>

// standard-mandated includes

// [iterator.range]
#include <__cxx03/__iterator/access.h>

// [tuple.helper]
#include <__cxx03/__tuple/tuple_element.h>
#include <__cxx03/__tuple/tuple_size.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__cxx03/__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp, size_t _Size>
struct _LIBCPP_TEMPLATE_VIS array {
  using __trivially_relocatable = __conditional_t<__libcpp_is_trivially_relocatable<_Tp>::value, array, void>;

  // types:
  using __self          = array;
  using value_type      = _Tp;
  using reference       = value_type&;
  using const_reference = const value_type&;
  using pointer         = value_type*;
  using const_pointer   = const value_type*;
#if defined(_LIBCPP_ABI_USE_WRAP_ITER_IN_STD_ARRAY)
  using iterator       = __wrap_iter<pointer>;
  using const_iterator = __wrap_iter<const_pointer>;
#else
  using iterator       = pointer;
  using const_iterator = const_pointer;
#endif
  using size_type              = size_t;
  using difference_type        = ptrdiff_t;
  using reverse_iterator       = std::reverse_iterator<iterator>;
  using const_reverse_iterator = std::reverse_iterator<const_iterator>;

  _Tp __elems_[_Size];

  // No explicit construct/copy/destroy for aggregate type
  _LIBCPP_HIDE_FROM_ABI void fill(const value_type& __u) { std::fill_n(data(), _Size, __u); }

  _LIBCPP_HIDE_FROM_ABI void swap(array& __a) { std::swap_ranges(data(), data() + _Size, __a.data()); }

  // iterators:
  _LIBCPP_HIDE_FROM_ABI iterator begin() _NOEXCEPT { return iterator(data()); }
  _LIBCPP_HIDE_FROM_ABI const_iterator begin() const _NOEXCEPT { return const_iterator(data()); }
  _LIBCPP_HIDE_FROM_ABI iterator end() _NOEXCEPT { return iterator(data() + _Size); }
  _LIBCPP_HIDE_FROM_ABI const_iterator end() const _NOEXCEPT { return const_iterator(data() + _Size); }

  _LIBCPP_HIDE_FROM_ABI reverse_iterator rbegin() _NOEXCEPT { return reverse_iterator(end()); }
  _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rbegin() const _NOEXCEPT { return const_reverse_iterator(end()); }
  _LIBCPP_HIDE_FROM_ABI reverse_iterator rend() _NOEXCEPT { return reverse_iterator(begin()); }
  _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rend() const _NOEXCEPT { return const_reverse_iterator(begin()); }

  _LIBCPP_HIDE_FROM_ABI const_iterator cbegin() const _NOEXCEPT { return begin(); }
  _LIBCPP_HIDE_FROM_ABI const_iterator cend() const _NOEXCEPT { return end(); }
  _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crbegin() const _NOEXCEPT { return rbegin(); }
  _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crend() const _NOEXCEPT { return rend(); }

  // capacity:
  _LIBCPP_HIDE_FROM_ABI size_type size() const _NOEXCEPT { return _Size; }
  _LIBCPP_HIDE_FROM_ABI size_type max_size() const _NOEXCEPT { return _Size; }
  _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI bool empty() const _NOEXCEPT { return _Size == 0; }

  // element access:
  _LIBCPP_HIDE_FROM_ABI reference operator[](size_type __n) _NOEXCEPT {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n < _Size, "out-of-bounds access in std::array<T, N>");
    return __elems_[__n];
  }
  _LIBCPP_HIDE_FROM_ABI const_reference operator[](size_type __n) const _NOEXCEPT {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n < _Size, "out-of-bounds access in std::array<T, N>");
    return __elems_[__n];
  }

  _LIBCPP_HIDE_FROM_ABI reference at(size_type __n) {
    if (__n >= _Size)
      __throw_out_of_range("array::at");
    return __elems_[__n];
  }

  _LIBCPP_HIDE_FROM_ABI const_reference at(size_type __n) const {
    if (__n >= _Size)
      __throw_out_of_range("array::at");
    return __elems_[__n];
  }

  _LIBCPP_HIDE_FROM_ABI reference front() _NOEXCEPT { return (*this)[0]; }
  _LIBCPP_HIDE_FROM_ABI const_reference front() const _NOEXCEPT { return (*this)[0]; }
  _LIBCPP_HIDE_FROM_ABI reference back() _NOEXCEPT { return (*this)[_Size - 1]; }
  _LIBCPP_HIDE_FROM_ABI const_reference back() const _NOEXCEPT { return (*this)[_Size - 1]; }

  _LIBCPP_HIDE_FROM_ABI value_type* data() _NOEXCEPT { return __elems_; }
  _LIBCPP_HIDE_FROM_ABI const value_type* data() const _NOEXCEPT { return __elems_; }
};

template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS array<_Tp, 0> {
  // types:
  typedef array __self;
  typedef _Tp value_type;
  typedef value_type& reference;
  typedef const value_type& const_reference;
  typedef value_type* iterator;
  typedef const value_type* const_iterator;
  typedef value_type* pointer;
  typedef const value_type* const_pointer;
  typedef size_t size_type;
  typedef ptrdiff_t difference_type;
  typedef std::reverse_iterator<iterator> reverse_iterator;
  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

  typedef __conditional_t<is_const<_Tp>::value, const __empty, __empty> _EmptyType;

  struct _ArrayInStructT {
    _Tp __data_[1];
  };
  _ALIGNAS_TYPE(_ArrayInStructT) _EmptyType __elems_[sizeof(_ArrayInStructT)];

  _LIBCPP_HIDE_FROM_ABI value_type* data() _NOEXCEPT { return nullptr; }
  _LIBCPP_HIDE_FROM_ABI const value_type* data() const _NOEXCEPT { return nullptr; }

  // No explicit construct/copy/destroy for aggregate type
  _LIBCPP_HIDE_FROM_ABI void fill(const value_type&) {
    static_assert(!is_const<_Tp>::value, "cannot fill zero-sized array of type 'const T'");
  }

  _LIBCPP_HIDE_FROM_ABI void swap(array&) _NOEXCEPT {
    static_assert(!is_const<_Tp>::value, "cannot swap zero-sized array of type 'const T'");
  }

  // iterators:
  _LIBCPP_HIDE_FROM_ABI iterator begin() _NOEXCEPT { return iterator(data()); }
  _LIBCPP_HIDE_FROM_ABI const_iterator begin() const _NOEXCEPT { return const_iterator(data()); }
  _LIBCPP_HIDE_FROM_ABI iterator end() _NOEXCEPT { return iterator(data()); }
  _LIBCPP_HIDE_FROM_ABI const_iterator end() const _NOEXCEPT { return const_iterator(data()); }

  _LIBCPP_HIDE_FROM_ABI reverse_iterator rbegin() _NOEXCEPT { return reverse_iterator(end()); }
  _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rbegin() const _NOEXCEPT { return const_reverse_iterator(end()); }
  _LIBCPP_HIDE_FROM_ABI reverse_iterator rend() _NOEXCEPT { return reverse_iterator(begin()); }
  _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rend() const _NOEXCEPT { return const_reverse_iterator(begin()); }

  _LIBCPP_HIDE_FROM_ABI const_iterator cbegin() const _NOEXCEPT { return begin(); }
  _LIBCPP_HIDE_FROM_ABI const_iterator cend() const _NOEXCEPT { return end(); }
  _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crbegin() const _NOEXCEPT { return rbegin(); }
  _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crend() const _NOEXCEPT { return rend(); }

  // capacity:
  _LIBCPP_HIDE_FROM_ABI size_type size() const _NOEXCEPT { return 0; }
  _LIBCPP_HIDE_FROM_ABI size_type max_size() const _NOEXCEPT { return 0; }
  _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI bool empty() const _NOEXCEPT { return true; }

  // element access:
  _LIBCPP_HIDE_FROM_ABI reference operator[](size_type) _NOEXCEPT {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
    __libcpp_unreachable();
  }

  _LIBCPP_HIDE_FROM_ABI const_reference operator[](size_type) const _NOEXCEPT {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
    __libcpp_unreachable();
  }

  _LIBCPP_HIDE_FROM_ABI reference at(size_type) {
    __throw_out_of_range("array<T, 0>::at");
    __libcpp_unreachable();
  }

  _LIBCPP_HIDE_FROM_ABI const_reference at(size_type) const {
    __throw_out_of_range("array<T, 0>::at");
    __libcpp_unreachable();
  }

  _LIBCPP_HIDE_FROM_ABI reference front() _NOEXCEPT {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::front() on a zero-sized array");
    __libcpp_unreachable();
  }

  _LIBCPP_HIDE_FROM_ABI const_reference front() const _NOEXCEPT {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::front() on a zero-sized array");
    __libcpp_unreachable();
  }

  _LIBCPP_HIDE_FROM_ABI reference back() _NOEXCEPT {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::back() on a zero-sized array");
    __libcpp_unreachable();
  }

  _LIBCPP_HIDE_FROM_ABI const_reference back() const _NOEXCEPT {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::back() on a zero-sized array");
    __libcpp_unreachable();
  }
};

template <class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool operator==(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
  return std::equal(__x.begin(), __x.end(), __y.begin());
}

template <class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
  return !(__x == __y);
}

template <class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool operator<(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
  return std::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
}

template <class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool operator>(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
  return __y < __x;
}

template <class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool operator<=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
  return !(__y < __x);
}

template <class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool operator>=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
  return !(__x < __y);
}

template <class _Tp, size_t _Size, __enable_if_t<_Size == 0 || __is_swappable_v<_Tp>, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI void swap(array<_Tp, _Size>& __x, array<_Tp, _Size>& __y) {
  __x.swap(__y);
}

template <class _Tp, size_t _Size>
struct _LIBCPP_TEMPLATE_VIS tuple_size<array<_Tp, _Size> > : public integral_constant<size_t, _Size> {};

template <size_t _Ip, class _Tp, size_t _Size>
struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, array<_Tp, _Size> > {
  static_assert(_Ip < _Size, "Index out of bounds in std::tuple_element<> (std::array)");
  typedef _Tp type;
};

template <size_t _Ip, class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI _Tp& get(array<_Tp, _Size>& __a) _NOEXCEPT {
  static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array)");
  return __a.__elems_[_Ip];
}

template <size_t _Ip, class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI const _Tp& get(const array<_Tp, _Size>& __a) _NOEXCEPT {
  static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array)");
  return __a.__elems_[_Ip];
}

template <size_t _Ip, class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI _Tp&& get(array<_Tp, _Size>&& __a) _NOEXCEPT {
  static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array &&)");
  return std::move(__a.__elems_[_Ip]);
}

template <size_t _Ip, class _Tp, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI const _Tp&& get(const array<_Tp, _Size>&& __a) _NOEXCEPT {
  static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array &&)");
  return std::move(__a.__elems_[_Ip]);
}

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES)
#  include <__cxx03/algorithm>
#  include <__cxx03/cstdlib>
#  include <__cxx03/iterator>
#  include <__cxx03/type_traits>
#  include <__cxx03/utility>
#endif

#endif // _LIBCPP___CXX03_ARRAY