Actually the answer is yes. This is exactly what is done by Boost.MPI!

When you send an object using Boost.MPI, it is serialized into an MPI buffer by the packed_oarchive. Then that buffer's content is sent via MPI and it is unpacked at the other end. All this is transparently done by the send and recv calls of Boost.MPI.

Matthias, so is possible to create this packed_oarchive for sender process, and packed_oarchive for receiver process and use plain MPI instructions MPI_send MPI_recv.