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+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// 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_SQLITE_ROW_HPP
+#define BOOST_SQLITE_ROW_HPP
+
+#include <boost/sqlite/field.hpp>
+
+BOOST_SQLITE_BEGIN_NAMESPACE
+
+/** @brief Representation of a row in a database.
+ @ingroup reference
+
+ Is a random-access range.
+
+ All values that are obtained by view are valid until the next row is read.
+
+ */
+struct row
+{
+ /// The size of the row
+ std::size_t size() const
+ {
+ return sqlite3_column_count(stm_);
+ }
+ /// Returns the field at `idx`, @throws std::out_of_range
+ BOOST_SQLITE_DECL
+ field at(std::size_t idx) const;
+ /// Returns the field at `idx`.
+ field operator[](std::size_t idx) const
+ {
+ field f;
+ f.stm_ = stm_;
+ f.col_ = static_cast<int>(idx);
+ return f;
+ }
+ /// Random access iterator used to iterate over the columns.
+ struct const_iterator
+ {
+ using difference_type = int;
+ using reference = field&;
+ using iterator_category = std::random_access_iterator_tag;
+
+ const_iterator & operator++()
+ {
+ f_.col_++;
+ return *this;
+ }
+
+ const_iterator operator++(int)
+ {
+ auto last = *this;
+ ++(*this);
+ return last;
+ }
+
+ const_iterator & operator--()
+ {
+ f_.col_--;
+ return *this;
+ }
+
+ const_iterator operator--(int)
+ {
+ auto last = *this;
+ --(*this);
+ return last;
+ }
+
+ field operator[](int i) const
+ {
+ auto f = f_;
+ f.col_ += i;
+ return f;
+ }
+
+ const_iterator operator+(int i) const
+ {
+ auto r = *this;
+ r.f_.col_ += i;
+ return r;
+ }
+
+ const_iterator operator-(int i) const
+ {
+ auto r = *this;
+ r.f_.col_ -= i;
+ return r;
+ }
+
+ const_iterator & operator+=(int i)
+ {
+ f_.col_ += i;
+ return *this;
+ }
+
+ const_iterator & operator-=(int i)
+ {
+ f_.col_ -= i;
+ return *this;
+ }
+
+ const field & operator*() const
+ {
+ return f_;
+ }
+
+ const field * operator->() const
+ {
+ return &f_;
+ }
+
+ bool operator==(const const_iterator& other) const
+ {
+ return f_.col_ == other.f_.col_
+ && f_.stm_ == other.f_.stm_;
+ }
+
+ bool operator!=(const const_iterator& other) const
+ {
+ return f_.col_ != other.f_.col_
+ || f_.stm_ != other.f_.stm_;
+ }
+
+ bool operator<(const const_iterator& other) const
+ {
+ return f_.col_ < other.f_.col_
+ && f_.stm_ < other.f_.stm_;
+ }
+
+ bool operator>(const const_iterator& other) const
+ {
+ return f_.col_ > other.f_.col_
+ && f_.stm_ > other.f_.stm_;
+ }
+
+ const_iterator() = default;
+ private:
+ friend struct row;
+ field f_;
+ };
+ /// Returns the begin of the column-range.
+ const_iterator begin() const
+ {
+ const_iterator ci;
+ ci.f_.col_ = 0;
+ ci.f_.stm_ = stm_;
+ return ci;
+ }
+ /// Returns the end of the column-range.
+ const_iterator end() const
+ {
+ const_iterator ci;
+ ci.f_.col_ = sqlite3_column_count(stm_);
+ ci.f_.stm_ = stm_;
+ return ci;
+ }
+ private:
+ friend struct resultset;
+ sqlite3_stmt * stm_;
+
+};
+
+BOOST_SQLITE_END_NAMESPACE
+
+#endif //BOOST_SQLITE_ROW_HPP