1 files changed, 6 insertions, 2 deletions
diff --git a/boost/archive/detail/polymorphic_oarchive_route.hpp b/boost/archive/detail/polymorphic_oarchive_route.hpp
index 9211df2aa7..ae750133a8 100644
--- a/boost/archive/detail/polymorphic_oarchive_route.hpp
+++ b/boost/archive/detail/polymorphic_oarchive_route.hpp
@@ -39,8 +39,8 @@ namespace serialization {
 namespace archive {
 namespace detail{
 
-class BOOST_ARCHIVE_DECL(BOOST_PP_EMPTY()) basic_oserializer;
-class BOOST_ARCHIVE_DECL(BOOST_PP_EMPTY()) basic_pointer_oserializer;
+class BOOST_ARCHIVE_DECL basic_oserializer;
+class BOOST_ARCHIVE_DECL basic_pointer_oserializer;
 
 #ifdef BOOST_MSVC
 #  pragma warning(push)
@@ -160,6 +160,10 @@ private:
     virtual void register_basic_serializer(const detail::basic_oserializer & bos){
         ArchiveImplementation::register_basic_serializer(bos);
     }
+    virtual helper_collection &
+    get_helper_collection(){
+        return ArchiveImplementation::get_helper_collection();
+    }
 public:
     // this can't be inheriteded because they appear in mulitple
     // parents