`protoc` generated source is not header-only. consider switching to `flatbuffer`.

[RobinQu]

alterantives benchmarks: https://github.com/kcchu/buffer-benchmarks

capnproto: https://capnproto.org/cxx.html flatbuffer: https://flatbuffers.dev/ msgpack (requires boost. 😢 ): https://github.com/msgpack/msgpack-c/wiki/install_boost