Merge commit 'efcea3a80da7c4479d5fe168435ecc9fd06bdc72' as 'subprojects/boost-sqlite'

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diff --git a/subprojects/boost-sqlite/include/boost/sqlite/row.hpp b/subprojects/boost-sqlite/include/boost/sqlite/row.hpp
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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