100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
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//
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// Copyright (c) 2019-2024 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_MYSQL_DETAIL_RESULTS_ITERATOR_HPP
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#define BOOST_MYSQL_DETAIL_RESULTS_ITERATOR_HPP
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#include <boost/mysql/resultset.hpp>
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#include <boost/mysql/resultset_view.hpp>
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#include <boost/mysql/detail/access.hpp>
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#include <boost/mysql/detail/execution_processor/results_impl.hpp>
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namespace boost {
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namespace mysql {
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namespace detail {
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class results_iterator
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{
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const results_impl* self_{};
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std::size_t index_{};
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public:
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using value_type = resultset;
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using reference = resultset_view;
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using pointer = resultset_view;
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using difference_type = std::ptrdiff_t;
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using iterator_category = std::random_access_iterator_tag;
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results_iterator() = default;
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results_iterator(const results_impl* self, std::size_t index) noexcept : self_(self), index_(index) {}
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results_iterator& operator++() noexcept
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{
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++index_;
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return *this;
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}
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results_iterator operator++(int) noexcept
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{
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auto res = *this;
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++(*this);
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return res;
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}
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results_iterator& operator--() noexcept
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{
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--index_;
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return *this;
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}
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results_iterator operator--(int) noexcept
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{
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auto res = *this;
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--(*this);
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return res;
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}
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results_iterator& operator+=(std::ptrdiff_t n) noexcept
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{
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index_ += n;
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return *this;
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}
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results_iterator& operator-=(std::ptrdiff_t n) noexcept
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{
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index_ -= n;
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return *this;
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}
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results_iterator operator+(std::ptrdiff_t n) const noexcept
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{
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return results_iterator(self_, index_ + n);
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}
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results_iterator operator-(std::ptrdiff_t n) const noexcept { return *this + (-n); }
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std::ptrdiff_t operator-(results_iterator rhs) const noexcept { return index_ - rhs.index_; }
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pointer operator->() const noexcept { return **this; }
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reference operator*() const noexcept { return (*this)[0]; }
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reference operator[](std::ptrdiff_t i) const noexcept
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{
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return access::construct<resultset_view>(*self_, index_ + i);
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}
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bool operator==(results_iterator rhs) const noexcept { return index_ == rhs.index_; }
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bool operator!=(results_iterator rhs) const noexcept { return !(*this == rhs); }
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bool operator<(results_iterator rhs) const noexcept { return index_ < rhs.index_; }
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bool operator<=(results_iterator rhs) const noexcept { return index_ <= rhs.index_; }
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bool operator>(results_iterator rhs) const noexcept { return index_ > rhs.index_; }
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bool operator>=(results_iterator rhs) const noexcept { return index_ >= rhs.index_; }
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std::size_t index() const noexcept { return index_; }
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const results_impl* obj() const noexcept { return self_; }
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};
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inline results_iterator operator+(std::ptrdiff_t n, results_iterator it) noexcept { return it + n; }
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} // namespace detail
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} // namespace mysql
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} // namespace boost
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#endif
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