Serialize (save) working with versioning

Simple case of making these functions for the rest of the output archive serialization functions and then adding it to
load.  Progress towards issue #8.

Author: AzothAmmo

include/cereal/cereal.hpp

@@ -217,6 +217,7 @@ namespace cereal
           unnecessary saves from taking place if multiple shared pointers
           point to the same data.
 
+          @internal
           @param addr The address (see shared_ptr get()) pointed to by the shared pointer
           @return A key that uniquely identifies the pointer */
       std::uint32_t registerSharedPointer( void const * addr )
@@ -240,6 +241,7 @@ namespace cereal
           unnecessary saves of identifying strings used by the polymorphic
           support functionality.
 
+          @internal
           @param name The name to associate with a polymorphic type
           @return A key that uniquely identifies the polymorphic type name */
       std::uint32_t registerPolymorphicType( char const * name )
@@ -273,6 +275,25 @@ namespace cereal
         self->process( std::forward<Other>( tail )... );
       }
 
+      /*! @name Boost Transition Layer (private)
+          Specific private functionality and overrides for enabling the Boost Transition Layer */
+      //! @{
+
+      //! Registers a class version with the archive and serializes it if necessary
+      /*! If this is the first time this class has been serialized, we will record its
+          version number and serialize that.
+
+          @tparam T The type of the class being serialized
+          @param version The version number associated with it */
+      template <class T> inline
+      void registerClassVersion( const std::uint32_t version )
+      {
+        const auto insertResult = itsVersionedTypes.insert( std::type_index(typeid(T)).hash_code() );
+        if( insertResult.second ) // insertion took place, serialize the version number
+          process( make_nvp<ArchiveType>("cereal_class_version", version) );
+      }
+
+
       //! Serialization of a virtual_base_class wrapper
       /*! \sa virtual_base_class */
       template <class T> inline
@@ -307,6 +328,18 @@ namespace cereal
         return *self;
       }
 
+      //! Member serialization
+      /*! Boost Transition Layer version */
+      template <class T> inline
+      typename std::enable_if<traits::is_output_serializable<T, ArchiveType>::value && traits::has_member_versioned_serialize<T, ArchiveType>::value,
+                              ArchiveType &>::type
+      processImpl(T const & t)
+      {
+        registerClassVersion<T>( detail::Version<T>::version );
+        access::member_serialize(*self, const_cast<T &>(t), detail::Version<T>::version);
+        return *self;
+      }
+
       //! Non member serialization
       template <class T> inline
       typename std::enable_if<traits::is_specialized_non_member_serialize<T, ArchiveType>::value ||

sandbox.cpp

@@ -674,8 +674,24 @@ int main()
   std::cerr << "-------------------------" << std::endl;
   std::cout << cereal::traits::has_member_serialize<BoostTransitionMS, cereal::BinaryOutputArchive>() << std::endl;
   std::cout << cereal::traits::has_member_versioned_serialize<BoostTransitionMS, cereal::BinaryOutputArchive>() << std::endl;
+  std::cout << cereal::traits::is_output_serializable<BoostTransitionMS, cereal::BinaryOutputArchive>() << std::endl;
+  std::cout << cereal::traits::is_output_versioned<BoostTransitionMS, cereal::BinaryOutputArchive>() << std::endl;
+
+  std::cout << (cereal::traits::is_output_serializable<BoostTransitionMS, cereal::BinaryOutputArchive>::value &&
+    cereal::traits::has_member_serialize<BoostTransitionMS, cereal::BinaryOutputArchive>::value &&
+    cereal::traits::is_output_versioned<BoostTransitionMS, cereal::BinaryOutputArchive>::value )<< std::endl;
+
+  {
+    // Boost transition layer stuff
+    cereal::XMLOutputArchive ar(std::cout);
+
+    BoostTransitionMS b(3);
+
+    ar( b );
+    ar( b );
+  }
 
   return 0;
 }
 
-CEREAL_CLASS_VERSION(std::vector<int>, 1);
+CEREAL_CLASS_VERSION(BoostTransitionMS, 1);