Gudmundur Adalsteinsson comments

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                                            Gudmundur Adalsteinsson

Sanitizer Errors When Zmq Send/Recv Structs with std::variant

This is unsafe since you are interpreting bytes as an object. It is also pobably not a good idea to send the bytes representing variant since it is not a...

Sanitizer Errors When Zmq Send/Recv Structs with std::variant

The data() function is really only safe for byte like types, unsigned char, char, and std byte. That should probably be better documented. But if you are sending a trivial...

Sanitizer Errors When Zmq Send/Recv Structs with std::variant

I think libzmq uses messages internally so when you `recv` messages (heap allocated ones) that is what you get. You could check the alignment of the data pointer at runtime,...

Sanitizer Errors When Zmq Send/Recv Structs with std::variant

ZMQ_PAIR is designed for inproc transport so maybe try that, or some other socket type over tcp.

Sanitizer Errors When Zmq Send/Recv Structs with std::variant

According to the docs tcp for pair is not suitable in some cases http://api.zeromq.org/4-3:zmq-socket but that may not be the case here.

set routing_id cause recv does not work

Can you try using the non-deprecated send/recv functions. And can you also provide how you send the data?

set routing_id cause recv does not work

The functions that are not marked as deprecated, the deprecated ones are easier to misuse.

can't use std::vector<zmq::message_t>

You can move it push_back(std::move(message)) or do explicit copy.

CPPZMQ_BUILD_TESTS failed with catch2.

Looks like that should be nullptr (or rather ZMQ_NULLPTR) instead of NULL., what compiler and std version are you using?

CPPZMQ_BUILD_TESTS failed with catch2.

You need to link to libzmq.