boost serialization omit version for a wrapper

Question

How can I tell boost that for a particular structure it should not write/read a class "version" identifier?

I am writing some wrapper classes for serializing some types in a smaller fashion (like a variable length integer). If the wrapper gets a class version written the whole point of the size reduction is lost (it'll end up bigger in most cases).

For example, given integer a I'll be replacing this code:

ar & a;

with this:

ar & wrapper(a);

I see the is_wrapper trait, but I can't really find any docs on what that does, or if it might help.

Answer 1

Add

BOOST_CLASS_IMPLEMENTATION(wrapper, boost::serialization::object_serializable)

It's the documented way.