132 lines
4.4 KiB
C++
132 lines
4.4 KiB
C++
#pragma once
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/*
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_META_ITERATOR_H
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#define BLT_META_ITERATOR_H
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#include <type_traits>
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#include <iterator>
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namespace blt::meta
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{
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template<typename Category>
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struct is_input_iterator_category
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{
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constexpr static bool value = std::is_same_v<Category, std::input_iterator_tag>;
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};
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template<typename Category>
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struct is_forward_iterator_category
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{
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constexpr static bool value = std::is_same_v<Category, std::forward_iterator_tag>;
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};
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template<typename Category>
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struct is_bidirectional_iterator_category
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{
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constexpr static bool value = std::is_same_v<Category, std::bidirectional_iterator_tag>;
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};
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template<typename Category>
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struct is_random_access_iterator_category
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{
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constexpr static bool value = std::is_same_v<Category, std::random_access_iterator_tag>;
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};
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template<typename Iter>
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inline constexpr bool is_input_iterator_category_v = is_input_iterator_category<Iter>::value;
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template<typename Iter>
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inline constexpr bool is_forward_iterator_category_v = is_forward_iterator_category<Iter>::value;
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template<typename Iter>
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inline constexpr bool is_bidirectional_iterator_category_v = is_bidirectional_iterator_category<Iter>::value;
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template<typename Iter>
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inline constexpr bool is_random_access_iterator_category_v = is_random_access_iterator_category<Iter>::value;
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template<typename Iter>
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inline constexpr bool is_bidirectional_or_better_category_v =
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is_bidirectional_iterator_category_v<Iter> || is_random_access_iterator_category_v<Iter>;
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// this is required! :/
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template<typename Iter>
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struct is_input_iterator
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{
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constexpr static bool value = is_input_iterator_category_v<typename std::iterator_traits<Iter>::iterator_category>;
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};
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template<typename Iter>
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struct is_forward_iterator
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{
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constexpr static bool value = is_forward_iterator_category_v<typename std::iterator_traits<Iter>::iterator_category>;
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};
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template<typename Iter>
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struct is_bidirectional_iterator
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{
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constexpr static bool value = is_bidirectional_iterator_category_v<typename std::iterator_traits<Iter>::iterator_category>;
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};
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template<typename Iter>
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struct is_random_access_iterator
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{
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constexpr static bool value = is_random_access_iterator_category_v<typename std::iterator_traits<Iter>::iterator_category>;
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};
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template<typename Iter>
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inline constexpr bool is_input_iterator_v = is_input_iterator<Iter>::value;
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template<typename Iter>
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inline constexpr bool is_forward_iterator_v = is_forward_iterator<Iter>::value;
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template<typename Iter>
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inline constexpr bool is_bidirectional_iterator_v = is_bidirectional_iterator<Iter>::value;
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template<typename Iter>
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inline constexpr bool is_random_access_iterator_v = is_random_access_iterator<Iter>::value;
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template<typename Iter>
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inline constexpr bool is_bidirectional_or_better_v = is_bidirectional_iterator_v<Iter> || is_random_access_iterator_v<Iter>;
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template<typename... Iter>
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struct lowest_iterator_category
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{
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using type = std::common_type_t<typename std::iterator_traits<Iter>::iterator_category...>;
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};
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template<typename... Iter>
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using lowest_iterator_category_t = typename lowest_iterator_category<Iter...>::type;
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template<typename Iter>
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struct is_reverse_iterator : std::false_type
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{
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};
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template<typename Iter>
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struct is_reverse_iterator<std::reverse_iterator<Iter>> : std::true_type
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{};
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template<typename Iter>
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inline constexpr bool is_reverse_iterator_v = is_reverse_iterator<Iter>::value;
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}
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#endif //BLT_META_ITERATOR_H
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