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| 1 | //===-- A self contained equivalent of std::array ---------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H |
| 10 | #define LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H |
| 11 | |
| 12 | #include "src/__support/CPP/iterator.h" // reverse_iterator |
| 13 | #include "src/__support/macros/attributes.h" |
| 14 | #include "src/__support/macros/config.h" |
| 15 | #include <stddef.h> // For size_t. |
| 16 | |
| 17 | namespace LIBC_NAMESPACE_DECL { |
| 18 | namespace cpp { |
| 19 | |
| 20 | template <class T, size_t N> struct array { |
| 21 | static_assert(N != 0, |
| 22 | "Cannot create a LIBC_NAMESPACE::cpp::array of size 0."); |
| 23 | |
| 24 | T Data[N]; |
| 25 | using value_type = T; |
| 26 | using iterator = T *; |
| 27 | using const_iterator = const T *; |
| 28 | using reverse_iterator = cpp::reverse_iterator<iterator>; |
| 29 | using const_reverse_iterator = cpp::reverse_iterator<const_iterator>; |
| 30 | |
| 31 | LIBC_INLINE constexpr T *data() { return Data; } |
| 32 | LIBC_INLINE constexpr const T *data() const { return Data; } |
| 33 | |
| 34 | LIBC_INLINE constexpr T &front() { return Data[0]; } |
| 35 | LIBC_INLINE constexpr const T &front() const { return Data[0]; } |
| 36 | |
| 37 | LIBC_INLINE constexpr T &back() { return Data[N - 1]; } |
| 38 | LIBC_INLINE constexpr const T &back() const { return Data[N - 1]; } |
| 39 | |
| 40 | LIBC_INLINE constexpr T &operator[](size_t Index) { return Data[Index]; } |
| 41 | |
| 42 | LIBC_INLINE constexpr const T &operator[](size_t Index) const { |
| 43 | return Data[Index]; |
| 44 | } |
| 45 | |
| 46 | LIBC_INLINE constexpr size_t size() const { return N; } |
| 47 | |
| 48 | LIBC_INLINE constexpr bool empty() const { return N == 0; } |
| 49 | |
| 50 | LIBC_INLINE constexpr iterator begin() { return Data; } |
| 51 | LIBC_INLINE constexpr const_iterator begin() const { return Data; } |
| 52 | LIBC_INLINE constexpr const_iterator cbegin() const { return begin(); } |
| 53 | |
| 54 | LIBC_INLINE constexpr iterator end() { return Data + N; } |
| 55 | LIBC_INLINE constexpr const_iterator end() const { return Data + N; } |
| 56 | LIBC_INLINE constexpr const_iterator cend() const { return end(); } |
| 57 | |
| 58 | LIBC_INLINE constexpr reverse_iterator rbegin() { |
| 59 | return reverse_iterator{end()}; |
| 60 | } |
| 61 | LIBC_INLINE constexpr const_reverse_iterator rbegin() const { |
| 62 | return const_reverse_iterator{end()}; |
| 63 | } |
| 64 | LIBC_INLINE constexpr const_reverse_iterator crbegin() const { |
| 65 | return rbegin(); |
| 66 | } |
| 67 | |
| 68 | LIBC_INLINE constexpr reverse_iterator rend() { |
| 69 | return reverse_iterator{begin()}; |
| 70 | } |
| 71 | LIBC_INLINE constexpr const_reverse_iterator rend() const { |
| 72 | return const_reverse_iterator{begin()}; |
| 73 | } |
| 74 | LIBC_INLINE constexpr const_reverse_iterator crend() const { return rend(); } |
| 75 | }; |
| 76 | |
| 77 | } // namespace cpp |
| 78 | } // namespace LIBC_NAMESPACE_DECL |
| 79 | |
| 80 | #endif // LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H |
| 81 |
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