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+//
+// Copyright (c) 2022 Klemens Morgenstern (klemens.morgenstern@gmx.net)
+//
+// 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_EXTENSION_HPP
+#define BOOST_SQLITE_EXTENSION_HPP
+
+#define BOOST_SQLITE_COMPILE_EXTENSION 1
+#include <boost/sqlite/detail/config.hpp>
+#include <boost/sqlite/connection.hpp>
+#include <boost/sqlite/detail/catch.hpp>
+#include <boost/config.hpp>
+
+
+/** @brief Declare a sqlite module.
+ @ingroup reference
+
+ @param Name The name of the module
+ @param Conn The parameter name of the connection
+
+ This macro can be used to create an sqlite extension.
+
+ @note When defining BOOST_SQLITE_COMPILE_EXTENSION (was is done in extension.hpp)
+        sqlite will use an inline namespace to avoid symbol clashes.
+
+ @par Examples
+
+ @code{.cpp}
+
+ BOOST_SQLITE_EXTENSION(extension, conn)
+ {
+    create_scalar_function(
+        conn, "assert",
+        [](boost::sqlite::context<>, boost::span<boost::sqlite::value, 1u> sp)
+        {
+            if (sp.front().get_int() == 0)
+              throw std::logic_error("assertion failed");
+        });
+ }
+
+ @endcode{.cpp}
+
+ */
+#define BOOST_SQLITE_EXTENSION(Name, Conn)                                \
+void sqlite_##Name##_impl (boost::sqlite::connection Conn);               \
+extern "C" BOOST_SYMBOL_EXPORT                                            \
+int sqlite3_##Name##_init(                                                \
+    sqlite3 *db,                                                          \
+    char **pzErrMsg,                                                      \
+    const sqlite3_api_routines *pApi)                                     \
+{                                                                         \
+  using boost::sqlite::sqlite3_api;                                       \
+  SQLITE_EXTENSION_INIT2(pApi);                                           \
+                                                                          \
+  BOOST_SQLITE_TRY                                                        \
+  {                                                                       \
+    sqlite_##Name##_impl(boost::sqlite::connection{db, false});           \
+    return SQLITE_OK;                                                     \
+  }                                                                       \
+  BOOST_SQLITE_CATCH_ASSIGN_STR_AND_RETURN(*pzErrMsg);                    \
+}                                                                         \
+void sqlite_##Name##_impl(boost::sqlite::connection Conn)
+
+#endif //BOOST_SQLITE_EXTENSION_HPP