BLT/include/blt/meta/iterator.h

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