[nly]

Capn'Proto isn't that bad. I've used the C++ quite a bit, and while the authors code style isn't to my taste it's fairly well designed (nice layering that lets you implement different use cases, like integrating the RPC framework with your own event loop).

There's also not much out there comparable to its capability passing RPC either.

Agree on the zero copy though, and the RPC framework does malloc a lot.