Grant Watson | 64285a1 | 2022-11-16 15:32:39 +0000 | [diff] [blame] | 1 | |
| 2 | // Copyright (c) 2022, ARM Limited. |
| 3 | // |
| 4 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | // you may not use this file except in compliance with the License. |
| 6 | // You may obtain a copy of the License at |
| 7 | // |
| 8 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | // |
| 10 | // Unless required by applicable law or agreed to in writing, software |
| 11 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | // See the License for the specific language governing permissions and |
| 14 | // limitations under the License. |
| 15 | |
| 16 | #ifndef ARRAY_PROXY_H_ |
| 17 | #define ARRAY_PROXY_H_ |
| 18 | |
| 19 | #include <cstddef> |
| 20 | #include <type_traits> |
| 21 | |
| 22 | template <typename T> |
| 23 | class ArrayProxy |
| 24 | { |
| 25 | public: |
| 26 | ArrayProxy(size_t n, T* ptr) noexcept |
| 27 | : _n(n) |
| 28 | , _ptr(ptr) |
| 29 | {} |
| 30 | |
| 31 | template <typename U = T, std::enable_if_t<std::is_const<U>::value, int> = 0> |
| 32 | ArrayProxy(size_t n, typename std::remove_const_t<T>* ptr) noexcept |
| 33 | : _n(n) |
| 34 | , _ptr(ptr) |
| 35 | {} |
| 36 | |
| 37 | template <std::size_t S> |
| 38 | ArrayProxy(T (&ptr)[S]) noexcept |
| 39 | : _n(S) |
| 40 | , _ptr(ptr) |
| 41 | {} |
| 42 | |
| 43 | template <std::size_t S, typename U = T, std::enable_if_t<std::is_const<U>::value, int> = 0> |
| 44 | ArrayProxy(typename std::remove_const_t<T> (&ptr)[S]) noexcept |
| 45 | : _n(S) |
| 46 | , _ptr(ptr) |
| 47 | {} |
| 48 | |
| 49 | template <typename O, |
| 50 | std::enable_if_t<std::is_convertible_v<decltype(std::declval<O>().data()), T*> && |
| 51 | std::is_convertible_v<decltype(std::declval<O>().size()), std::size_t>, |
| 52 | int> = 0> |
| 53 | ArrayProxy(O& obj) noexcept |
| 54 | : _n(obj.size()) |
| 55 | , _ptr(obj.data()) |
| 56 | {} |
| 57 | |
| 58 | size_t size() const noexcept |
| 59 | { |
| 60 | return _n; |
| 61 | } |
| 62 | |
| 63 | T* data() const noexcept |
| 64 | { |
| 65 | return _ptr; |
| 66 | } |
| 67 | |
| 68 | bool empty() const noexcept |
| 69 | { |
| 70 | return _n == 0; |
| 71 | } |
| 72 | |
| 73 | const T* begin() const noexcept |
| 74 | { |
| 75 | return _ptr; |
| 76 | } |
| 77 | |
| 78 | const T* end() const noexcept |
| 79 | { |
| 80 | return _ptr + _n; |
| 81 | } |
| 82 | |
| 83 | T& operator[](size_t idx) noexcept |
| 84 | { |
| 85 | return *(_ptr + idx); |
| 86 | } |
| 87 | |
| 88 | const T& operator[](size_t idx) const noexcept |
| 89 | { |
| 90 | return *(_ptr + idx); |
| 91 | } |
| 92 | |
| 93 | private: |
| 94 | size_t _n; |
| 95 | T* _ptr; |
| 96 | }; |
| 97 | |
| 98 | #endif // ARRAY_PROXY_H_ |