1 // Copyright 2020 The Pigweed Authors
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
7 // https://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
18 #include "pw_polyfill/standard_library/namespace.h"
20 _PW_POLYFILL_BEGIN_NAMESPACE_STD
22 template <typename T, decltype(sizeof(0)) kSize>
25 using size_type = decltype(kSize);
26 using difference_type =
27 decltype(static_cast<int*>(nullptr) - static_cast<int*>(nullptr));
28 using reference = value_type&;
29 using const_reference = const value_type&;
30 using pointer = value_type*;
31 using const_pointer = const value_type*;
33 using const_iterator = const T*;
34 using reverse_iterator = std::reverse_iterator<iterator>;
35 using const_reverse_iterator = std::reverse_iterator<const_iterator>;
37 // NOT IMPLEMENTED: at() does not bounds checking.
38 constexpr reference at(size_type index) { return data()[index]; }
39 constexpr const_reference at(size_type index) const { return data()[index]; }
41 constexpr reference operator[](size_type index) { return data()[index]; }
42 constexpr const_reference operator[](size_type index) const {
46 constexpr reference front() { return data()[0]; }
47 constexpr const_reference front() const { return data()[0]; }
49 constexpr reference back() {
50 static_assert(kSize > 0);
51 return data()[size() - 1];
53 constexpr const_reference back() const {
54 static_assert(kSize > 0);
55 return data()[size() - 1];
58 constexpr pointer data() noexcept {
59 static_assert(kSize > 0);
62 constexpr const_pointer data() const noexcept {
63 static_assert(kSize > 0);
67 constexpr iterator begin() noexcept { return data(); }
68 constexpr const_iterator begin() const noexcept { return data(); }
69 constexpr const_iterator cbegin() const noexcept { return begin(); }
71 constexpr iterator end() noexcept { return data() + kSize; }
72 constexpr const_iterator end() const noexcept { return data() + kSize; }
73 constexpr const_iterator cend() const noexcept { return end(); }
76 constexpr reverse_iterator rbegin() noexcept;
77 constexpr const_reverse_iterator rbegin() const noexcept;
78 constexpr const_reverse_iterator crbegin() const noexcept;
81 constexpr reverse_iterator rend() noexcept;
82 constexpr const_reverse_iterator rend() const noexcept;
83 constexpr const_reverse_iterator crend() const noexcept;
85 [[nodiscard]] constexpr bool empty() const noexcept { return kSize == 0u; }
87 constexpr size_type size() const noexcept { return kSize; }
89 constexpr size_type max_size() const noexcept { return size(); }
91 constexpr void fill(const T& value) {
92 for (T& array_value : __data) {
98 constexpr void swap(array& other) noexcept;
103 // NOT IMPLEMENTED: comparison operators, get, swap, tuple specializations
105 _PW_POLYFILL_END_NAMESPACE_STD