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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H10#define LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H11 12#include "src/__support/CPP/iterator.h" // reverse_iterator13#include "src/__support/macros/attributes.h"14#include "src/__support/macros/config.h"15#include <stddef.h> // For size_t.16 17namespace LIBC_NAMESPACE_DECL {18namespace cpp {19 20template <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 cpp78} // namespace LIBC_NAMESPACE_DECL79 80#endif // LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H81