Sending a protobuf message using zmq

basic_zmq.cpp

#include <iostream>
#include <zmq.hpp>
#include "basic.pb.h"

int main(int argc, char** argv) {
    zmq::context_t context{1};
    zmq::socket_t sender{context, ZMQ_PAIR};
    zmq::socket_t receiver{context, ZMQ_PAIR};
    
    sender.bind("tcp://*:*");
    char raw_address[1024];
    size_t size = sizeof(raw_address);
    sender.getsockopt(ZMQ_LAST_ENDPOINT, &raw_address, &size);
    auto address = std::string{raw_address};
    auto port = std::stoi(address.substr(address.find(':', 4) + 1, address.length()));
    
    std::stringstream url;
    url << "tcp://0.0.0.0:" << port;
    receiver.connect(url.str().data());
    
    Basic basic;
    basic.set_value("hello world!");
    std::ostringstream output_stream;
    basic.SerializeToOstream(&output_stream);
    auto output_string = output_stream.str();
    zmq::message_t output{output_string.length()};
    memcpy(output.data(), output_string.data(), output_string.length());
    sender.send(message);
    
    zmq::message_t input;
    Basic received;
    receiver.recv(&input);
    received.ParseFromString(std::string{(char*) input.data(), input.size()});
    
    std::cout << received.value() << std::endl;
}