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-rw-r--r--odb/traits.hxx60
1 files changed, 19 insertions, 41 deletions
diff --git a/odb/traits.hxx b/odb/traits.hxx
index 495d972..5dfee3a 100644
--- a/odb/traits.hxx
+++ b/odb/traits.hxx
@@ -12,6 +12,25 @@
namespace odb
{
+ // Fallback dummy for non-persistent classes. It is necessary to allow
+ // the C++ compiler to instantiate persist(), etc., signatures in class
+ // database when T is a pointer (raw, smart). The overloads that use
+ // these dummy would never actually be selected by the compiler.
+ //
+ template <typename T>
+ class access::object_traits
+ {
+ // If a C++ compiler issues an error pointing to this c;ass and saying
+ // that it missing some declaration, then you are most likely trying to
+ // perform a database operation on a C++ type that is not a persistent
+ // object. Or you forgot to include the corresponding -odb.hxx file.
+ //
+ public:
+ struct id_type {};
+ typedef T object_type;
+ typedef T* pointer_type;
+ };
+
template <typename T, typename P>
class access::object_factory
{
@@ -140,47 +159,6 @@ namespace odb
static const bool polymorphic = access::object_traits<T>::polymorphic;
};
- // Specializations for pointer types to allow the C++ compiler to
- // instantiate persist(), etc., signatures in class database. The
- // overloads that use these specializations would never actually
- // be selected by the compiler.
- //
- template <typename T>
- struct object_traits<T*>
- {
- struct id_type {};
- };
-
- template <typename T>
- struct object_traits<T* const>
- {
- struct id_type {};
- };
-
- template <typename T, template <typename> class P>
- struct object_traits<P<T> >
- {
- struct id_type {};
- };
-
- template <typename T, typename A1, template <typename, typename> class P>
- struct object_traits<P<T, A1> >
- {
- struct id_type {};
- };
-
- template <typename T, template <typename> class P>
- struct object_traits<const P<T> >
- {
- struct id_type {};
- };
-
- template <typename T, typename A1, template <typename, typename> class P>
- struct object_traits<const P<T, A1> >
- {
- struct id_type {};
- };
-
// Specialization for section to allow instantiation of all the load()
// signature.
//