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Update STL headers
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include_std/iterator
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85
include_std/iterator
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/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel 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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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#pragma once
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namespace std
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{
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struct input_iterator_tag
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{
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};
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struct output_iterator_tag
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{
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};
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struct forward_iterator_tag : public input_iterator_tag
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{
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};
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struct bidirectional_iterator_tag : public forward_iterator_tag
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{
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};
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struct random_access_iterator_tag : public bidirectional_iterator_tag
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{
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};
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struct contiguous_iterator_tag : public random_access_iterator_tag
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{
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};
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template <class Iter>
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class reverse_iterator
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{
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public:
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/* FIXME: missing implementation */
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};
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template <class Iter>
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struct iterator_traits
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{
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public:
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typedef Iter::difference_type difference_type;
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/* FIXME: missing implementation */
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};
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template <class It>
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constexpr typename std::iterator_traits<It>::difference_type __do_distance(It first, It last, std::input_iterator_tag)
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{
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typename std::iterator_traits<It>::difference_type result = 0;
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while (first != last)
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{
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++first;
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++result;
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}
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return result;
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}
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template <class It>
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constexpr typename std::iterator_traits<It>::difference_type __do_distance(It first, It last, std::random_access_iterator_tag)
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{
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return last - first;
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}
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template <class InputIt>
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constexpr typename std::iterator_traits<InputIt>::difference_type distance(InputIt first, InputIt last)
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{
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return __do_distance(first, last, typename std::iterator_traits<InputIt>::iterator_category());
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}
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}
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