Lirong wrote:

I remember that pointers to built-in types can not be serialized directly in earlier versions of the library. The user would have to write a wrapper around the built-in type. How is the situation now?

The default serialization traits are such that pointers to primitive types are set to not-serializable. Suppose you set the implementation_level<long> to object serializable and serialize a pointer to a long. This well mean that all serialized longs have to be tracked. Do you want something like this to happen? Its possible to serialize a pointer to primitive - I just can't imagine a case where one would want to do because of the side effects it would cause. That's why I recommend wrapping the primitive in its own type so that you don't create a lot of unexpected/undesired side-effects. Look at strong typedef for a simple cheap automatic wrapper. Robert Ramey