19 template <class T, size_t N> struct array {  struct
23   T Data[N];
24   using value_type = T;
25   using iterator = T *;
26   using const_iterator = const T *;
27   using reverse_iterator = cpp::reverse_iterator<iterator>;
28   using const_reverse_iterator = cpp::reverse_iterator<const_iterator>;
30   LIBC_INLINE constexpr T *data() { return Data; }  in data()
31   LIBC_INLINE constexpr const T *data() const { return Data; }  in data()
33   LIBC_INLINE constexpr T &front() { return Data[0]; }  in front()
34   LIBC_INLINE constexpr const T &front() const { return Data[0]; }  in front()
36   LIBC_INLINE constexpr T &back() { return Data[N - 1]; }  in back()
37   LIBC_INLINE constexpr const T &back() const { return Data[N - 1]; }  in back()
45   LIBC_INLINE constexpr size_t size() const { return N; }  in size()
47   LIBC_INLINE constexpr bool empty() const { return N == 0; }  in empty()
49   LIBC_INLINE constexpr iterator begin() { return Data; }  in begin()
50   LIBC_INLINE constexpr const_iterator begin() const { return Data; }  in begin()
51   LIBC_INLINE constexpr const_iterator cbegin() const { return begin(); }  in cbegin()
53   LIBC_INLINE constexpr iterator end() { return Data + N; }  in end()
54   LIBC_INLINE constexpr const_iterator end() const { return Data + N; }  in end()
55   LIBC_INLINE constexpr const_iterator cend() const { return end(); }  in cend()
57   LIBC_INLINE constexpr reverse_iterator rbegin() {  in rbegin()
60   LIBC_INLINE constexpr const_reverse_iterator rbegin() const {  in rbegin()
63   LIBC_INLINE constexpr const_reverse_iterator crbegin() const {  in crbegin()
67   LIBC_INLINE constexpr reverse_iterator rend() {  in rend()
70   LIBC_INLINE constexpr const_reverse_iterator rend() const {  in rend()
73   LIBC_INLINE constexpr const_reverse_iterator crend() const { return rend(); }  in crend()