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+// file : libbrep/wrapper-traits.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef LIBBREP_WRAPPER_TRAITS_HXX
+#define LIBBREP_WRAPPER_TRAITS_HXX
+
+#include <odb/pre.hxx>
+
+#include <butl/optional>
+
+#include <odb/wrapper-traits.hxx>
+
+namespace odb
+{
+ template <typename T>
+ class wrapper_traits<butl::optional<T>>
+ {
+ public:
+ typedef T wrapped_type;
+ typedef butl::optional<T> wrapper_type;
+
+ // T can be const.
+ //
+ typedef
+ typename odb::details::meta::remove_const<T>::result
+ unrestricted_wrapped_type;
+
+ static const bool null_handler = true;
+ static const bool null_default = true;
+
+ static bool
+ get_null (const wrapper_type& o)
+ {
+ return !o;
+ }
+
+ static void
+ set_null (wrapper_type& o)
+ {
+ o = wrapper_type ();
+ }
+
+ static const wrapped_type&
+ get_ref (const wrapper_type& o)
+ {
+ return *o;
+ }
+
+ static unrestricted_wrapped_type&
+ set_ref (wrapper_type& o)
+ {
+ if (!o)
+ o = unrestricted_wrapped_type ();
+
+ return const_cast<unrestricted_wrapped_type&> (*o);
+ }
+ };
+}
+
+#include <odb/post.hxx>
+
+#endif // LIBBREP_WRAPPER_TRAITS_HXX