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Diffstat (limited to 'include/ftl/array_traits.h')
-rw-r--r-- | include/ftl/array_traits.h | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/include/ftl/array_traits.h b/include/ftl/array_traits.h deleted file mode 100644 index 1265fa15fe..0000000000 --- a/include/ftl/array_traits.h +++ /dev/null @@ -1,135 +0,0 @@ -/* - * Copyright 2020 The Android Open Source Project - * - * 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. - */ - -#pragma once - -#include <algorithm> -#include <iterator> -#include <new> -#include <type_traits> - -#define FTL_ARRAY_TRAIT(T, U) using U = typename ArrayTraits<T>::U - -namespace android::ftl { - -template <typename T> -struct ArrayTraits { - using value_type = T; - using size_type = std::size_t; - using difference_type = std::ptrdiff_t; - - using pointer = value_type*; - using reference = value_type&; - using iterator = pointer; - using reverse_iterator = std::reverse_iterator<iterator>; - - using const_pointer = const value_type*; - using const_reference = const value_type&; - using const_iterator = const_pointer; - using const_reverse_iterator = std::reverse_iterator<const_iterator>; - - template <typename... Args> - static pointer construct_at(const_iterator it, Args&&... args) { - void* const ptr = const_cast<void*>(static_cast<const void*>(it)); - if constexpr (std::is_constructible_v<value_type, Args...>) { - // TODO: Replace with std::construct_at in C++20. - return new (ptr) value_type(std::forward<Args>(args)...); - } else { - // Fall back to list initialization. - return new (ptr) value_type{std::forward<Args>(args)...}; - } - } -}; - -// CRTP mixin to define iterator functions in terms of non-const Self::begin and Self::end. -template <typename Self, typename T> -class ArrayIterators { - FTL_ARRAY_TRAIT(T, size_type); - - FTL_ARRAY_TRAIT(T, reference); - FTL_ARRAY_TRAIT(T, iterator); - FTL_ARRAY_TRAIT(T, reverse_iterator); - - FTL_ARRAY_TRAIT(T, const_reference); - FTL_ARRAY_TRAIT(T, const_iterator); - FTL_ARRAY_TRAIT(T, const_reverse_iterator); - - Self& self() const { return *const_cast<Self*>(static_cast<const Self*>(this)); } - - public: - const_iterator begin() const { return cbegin(); } - const_iterator cbegin() const { return self().begin(); } - - const_iterator end() const { return cend(); } - const_iterator cend() const { return self().end(); } - - reverse_iterator rbegin() { return std::make_reverse_iterator(self().end()); } - const_reverse_iterator rbegin() const { return crbegin(); } - const_reverse_iterator crbegin() const { return self().rbegin(); } - - reverse_iterator rend() { return std::make_reverse_iterator(self().begin()); } - const_reverse_iterator rend() const { return crend(); } - const_reverse_iterator crend() const { return self().rend(); } - - iterator last() { return self().end() - 1; } - const_iterator last() const { return self().last(); } - - reference front() { return *self().begin(); } - const_reference front() const { return self().front(); } - - reference back() { return *last(); } - const_reference back() const { return self().back(); } - - reference operator[](size_type i) { return *(self().begin() + i); } - const_reference operator[](size_type i) const { return self()[i]; } -}; - -// Mixin to define comparison operators for an array-like template. -// TODO: Replace with operator<=> in C++20. -template <template <typename, std::size_t> class Array> -struct ArrayComparators { - template <typename T, std::size_t N, std::size_t M> - friend bool operator==(const Array<T, N>& lhs, const Array<T, M>& rhs) { - return lhs.size() == rhs.size() && std::equal(lhs.begin(), lhs.end(), rhs.begin()); - } - - template <typename T, std::size_t N, std::size_t M> - friend bool operator<(const Array<T, N>& lhs, const Array<T, M>& rhs) { - return std::lexicographical_compare(lhs.begin(), lhs.end(), rhs.begin(), rhs.end()); - } - - template <typename T, std::size_t N, std::size_t M> - friend bool operator>(const Array<T, N>& lhs, const Array<T, M>& rhs) { - return rhs < lhs; - } - - template <typename T, std::size_t N, std::size_t M> - friend bool operator!=(const Array<T, N>& lhs, const Array<T, M>& rhs) { - return !(lhs == rhs); - } - - template <typename T, std::size_t N, std::size_t M> - friend bool operator>=(const Array<T, N>& lhs, const Array<T, M>& rhs) { - return !(lhs < rhs); - } - - template <typename T, std::size_t N, std::size_t M> - friend bool operator<=(const Array<T, N>& lhs, const Array<T, M>& rhs) { - return !(lhs > rhs); - } -}; - -} // namespace android::ftl |