You're going to have to send them as a sequence of bytes somehow. MessagePack converts your data structures into a straightforward binary format, or lets you ro

You're going to have to send them as a sequence of bytes somehow. MessagePack converts your data structures into a straightforward binary format, or lets you roll your own custom serializers easily (I've used it, and it's good stuff), and JSON does something similar in a less compact but more human-readable form. If your data structures are very simple, you could roll your own, e.g. send an array of ints by just converting them to network byte order and sending them. Once you've got your data expressed as a sequence of bytes, you can send that with ZeroMQ. Or with HTTP, or raw sockets, or whatever. The serialization format and the transport protocol are pretty much completely independent.