| |
| // Copyright (c) 2022, ARM Limited. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef ARRAY_PROXY_H_ |
| #define ARRAY_PROXY_H_ |
| |
| #include <cstddef> |
| #include <type_traits> |
| |
| template <typename T> |
| class ArrayProxy |
| { |
| public: |
| ArrayProxy(size_t n, T* ptr) noexcept |
| : _n(n) |
| , _ptr(ptr) |
| {} |
| |
| template <typename U = T, std::enable_if_t<std::is_const<U>::value, int> = 0> |
| ArrayProxy(size_t n, typename std::remove_const_t<T>* ptr) noexcept |
| : _n(n) |
| , _ptr(ptr) |
| {} |
| |
| template <std::size_t S> |
| ArrayProxy(T (&ptr)[S]) noexcept |
| : _n(S) |
| , _ptr(ptr) |
| {} |
| |
| template <std::size_t S, typename U = T, std::enable_if_t<std::is_const<U>::value, int> = 0> |
| ArrayProxy(typename std::remove_const_t<T> (&ptr)[S]) noexcept |
| : _n(S) |
| , _ptr(ptr) |
| {} |
| |
| template <typename O, |
| std::enable_if_t<std::is_convertible_v<decltype(std::declval<O>().data()), T*> && |
| std::is_convertible_v<decltype(std::declval<O>().size()), std::size_t>, |
| int> = 0> |
| ArrayProxy(O& obj) noexcept |
| : _n(obj.size()) |
| , _ptr(obj.data()) |
| {} |
| |
| size_t size() const noexcept |
| { |
| return _n; |
| } |
| |
| T* data() const noexcept |
| { |
| return _ptr; |
| } |
| |
| bool empty() const noexcept |
| { |
| return _n == 0; |
| } |
| |
| const T* begin() const noexcept |
| { |
| return _ptr; |
| } |
| |
| const T* end() const noexcept |
| { |
| return _ptr + _n; |
| } |
| |
| T& operator[](size_t idx) noexcept |
| { |
| return *(_ptr + idx); |
| } |
| |
| const T& operator[](size_t idx) const noexcept |
| { |
| return *(_ptr + idx); |
| } |
| |
| private: |
| size_t _n; |
| T* _ptr; |
| }; |
| |
| #endif // ARRAY_PROXY_H_ |