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"ZeroMQ’s actual C library (libzmq) is just an implementation detail."

That's a spot on. It doesn't really matter whether you are using ZeroMQ, NullMQ or raw HTTP.

It's like OO-programming: You can write OO program in any language.

Same way, you can do distributed messaging on top of any transport layer.

Not that it matters much, but ZeroMQ is written in C++, while exposing "C" only interface, and then additionally there is a C++ binding to this "C" interface, which IMHO is very robust design (C for API is much easier to access from other langs).

You are right, however C bindings in other languages usually look quite ugly and non-idiomatic, but ZeroMQ did great job in that sense and their higher level language bindings are written with language specifics in mind

Exactly, I'm very happy that message went through!

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