113 lines
3.3 KiB
C++
113 lines
3.3 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_ROWS_ITERATOR_HPP
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#define BOOST_MYSQL_DETAIL_ROWS_ITERATOR_HPP
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#include <boost/mysql/field_view.hpp>
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#include <boost/mysql/row.hpp>
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#include <boost/mysql/row_view.hpp>
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#include <boost/mysql/detail/access.hpp>
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#include <cstddef>
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#include <cstdint>
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#include <iterator>
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namespace boost {
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namespace mysql {
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namespace detail {
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inline row_view row_slice(const field_view* fields, std::size_t num_columns, std::size_t offset) noexcept
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{
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return access::construct<row_view>(fields + num_columns * offset, num_columns);
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}
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class rows_iterator
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{
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const field_view* fields_{nullptr};
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std::size_t num_columns_{0};
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std::size_t row_num_{0};
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public:
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using value_type = row;
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using reference = row_view;
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using pointer = row_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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rows_iterator() = default;
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rows_iterator(const field_view* fields, std::size_t num_columns, std::size_t rownum) noexcept
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: fields_(fields), num_columns_(num_columns), row_num_(rownum)
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{
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}
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rows_iterator& operator++() noexcept
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{
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++row_num_;
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return *this;
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}
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rows_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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rows_iterator& operator--() noexcept
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{
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--row_num_;
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return *this;
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}
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rows_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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rows_iterator& operator+=(std::ptrdiff_t n) noexcept
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{
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row_num_ += n;
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return *this;
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}
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rows_iterator& operator-=(std::ptrdiff_t n) noexcept
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{
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row_num_ -= n;
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return *this;
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}
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rows_iterator operator+(std::ptrdiff_t n) const noexcept
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{
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return rows_iterator(fields_, num_columns_, row_num_ + n);
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}
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rows_iterator operator-(std::ptrdiff_t n) const noexcept
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{
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return rows_iterator(fields_, num_columns_, row_num_ - n);
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}
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std::ptrdiff_t operator-(rows_iterator rhs) const noexcept { return row_num_ - rhs.row_num_; }
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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 row_slice(fields_, num_columns_, row_num_ + i);
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}
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bool operator==(rows_iterator rhs) const noexcept { return row_num_ == rhs.row_num_; }
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bool operator!=(rows_iterator rhs) const noexcept { return !(*this == rhs); }
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bool operator<(rows_iterator rhs) const noexcept { return row_num_ < rhs.row_num_; }
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bool operator<=(rows_iterator rhs) const noexcept { return row_num_ <= rhs.row_num_; }
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bool operator>(rows_iterator rhs) const noexcept { return row_num_ > rhs.row_num_; }
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bool operator>=(rows_iterator rhs) const noexcept { return row_num_ >= rhs.row_num_; }
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};
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inline rows_iterator operator+(std::ptrdiff_t n, rows_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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