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+// file : odb/pgsql/details/conversion.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_PGSQL_DETAILS_CONVERSION_HXX
+#define ODB_PGSQL_DETAILS_CONVERSION_HXX
+
+#include <odb/pgsql/traits.hxx>
+
+#include <odb/details/meta/answer.hxx>
+
+namespace odb
+{
+ // @@ Revise this.
+ //
+ namespace details {}
+
+ namespace pgsql
+ {
+ namespace details
+ {
+ using namespace odb::details;
+
+ // Detect whether conversion is specified in type_traits.
+ //
+ template <typename T>
+ meta::yes
+ conversion_p_test (typename type_traits<T>::conversion*);
+
+ template <typename T>
+ meta::no
+ conversion_p_test (...);
+
+ template <typename T>
+ struct conversion_p
+ {
+ static const bool value =
+ sizeof (conversion_p_test<T> (0)) == sizeof (meta::yes);
+ };
+
+ template <typename T, bool = conversion_p<T>::value>
+ struct conversion;
+
+ template <typename T>
+ struct conversion<T, true>
+ {
+ static const char* to () {return type_traits<T>::conversion::to ();}
+ };
+
+ template <typename T>
+ struct conversion<T, false>
+ {
+ static const char* to () {return 0;}
+ };
+ }
+ }
+}
+
+#endif // ODB_PGSQL_DETAILS_CONVERSION_HXX