update boost

linx64/include/boost/mysql/detail/rows_iterator.hpp

@@ -0,0 +1,112 @@
+//
+// Copyright (c) 2019-2023 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_MYSQL_DETAIL_ROWS_ITERATOR_HPP
+#define BOOST_MYSQL_DETAIL_ROWS_ITERATOR_HPP
+
+#include <boost/mysql/field_view.hpp>
+#include <boost/mysql/row.hpp>
+#include <boost/mysql/row_view.hpp>
+
+#include <boost/mysql/detail/access.hpp>
+
+#include <cstddef>
+#include <cstdint>
+#include <iterator>
+
+namespace boost {
+namespace mysql {
+namespace detail {
+
+inline row_view row_slice(const field_view* fields, std::size_t num_columns, std::size_t offset) noexcept
+{
+    return access::construct<row_view>(fields + num_columns * offset, num_columns);
+}
+
+class rows_iterator
+{
+    const field_view* fields_{nullptr};
+    std::size_t num_columns_{0};
+    std::size_t row_num_{0};
+
+public:
+    using value_type = row;
+    using reference = row_view;
+    using pointer = row_view;
+    using difference_type = std::ptrdiff_t;
+    using iterator_category = std::random_access_iterator_tag;
+
+    rows_iterator() = default;
+    rows_iterator(const field_view* fields, std::size_t num_columns, std::size_t rownum) noexcept
+        : fields_(fields), num_columns_(num_columns), row_num_(rownum)
+    {
+    }
+
+    rows_iterator& operator++() noexcept
+    {
+        ++row_num_;
+        return *this;
+    }
+    rows_iterator operator++(int) noexcept
+    {
+        auto res = *this;
+        ++(*this);
+        return res;
+    }
+    rows_iterator& operator--() noexcept
+    {
+        --row_num_;
+        return *this;
+    }
+    rows_iterator operator--(int) noexcept
+    {
+        auto res = *this;
+        --(*this);
+        return res;
+    }
+    rows_iterator& operator+=(std::ptrdiff_t n) noexcept
+    {
+        row_num_ += n;
+        return *this;
+    }
+    rows_iterator& operator-=(std::ptrdiff_t n) noexcept
+    {
+        row_num_ -= n;
+        return *this;
+    }
+    rows_iterator operator+(std::ptrdiff_t n) const noexcept
+    {
+        return rows_iterator(fields_, num_columns_, row_num_ + n);
+    }
+    rows_iterator operator-(std::ptrdiff_t n) const noexcept
+    {
+        return rows_iterator(fields_, num_columns_, row_num_ - n);
+    }
+    std::ptrdiff_t operator-(rows_iterator rhs) const noexcept { return row_num_ - rhs.row_num_; }
+
+    pointer operator->() const noexcept { return **this; }
+    reference operator*() const noexcept { return (*this)[0]; }
+    reference operator[](std::ptrdiff_t i) const noexcept
+    {
+        return row_slice(fields_, num_columns_, row_num_ + i);
+    }
+
+    bool operator==(rows_iterator rhs) const noexcept { return row_num_ == rhs.row_num_; }
+    bool operator!=(rows_iterator rhs) const noexcept { return !(*this == rhs); }
+    bool operator<(rows_iterator rhs) const noexcept { return row_num_ < rhs.row_num_; }
+    bool operator<=(rows_iterator rhs) const noexcept { return row_num_ <= rhs.row_num_; }
+    bool operator>(rows_iterator rhs) const noexcept { return row_num_ > rhs.row_num_; }
+    bool operator>=(rows_iterator rhs) const noexcept { return row_num_ >= rhs.row_num_; }
+};
+
+inline rows_iterator operator+(std::ptrdiff_t n, rows_iterator it) noexcept { return it + n; }
+
+}  // namespace detail
+}  // namespace mysql
+}  // namespace boost
+
+#endif