Everywhere I worked we had our custom network stack, on top of posix or even lower level. We wouldn't replace it with something from the standard. Everywhere I

Everywhere I worked we had our custom network stack, on top of posix or even lower level. We wouldn't replace it with something from the standard. Everywhere I worked we also had custom ad-hoc reflection/code synthesis, usually via preprocessing. We would have replaced with a builtin solution in an heartbeat.