通过ZeroMQ接收对象作为字符串然后通过另一个套接字以零拷贝发送的正确方法是什么？

Question

I am receiving a large, serialized, binary object using ZeroMQ :

std::unique_ptr<Message> input(CreateMessage());

if (Receive(input, "data") > 0) {
    std::string serialStr(static_cast<char*>(input->GetData()), input->GetSize());
}

How can I send this object through another socket avoiding the unnecessary memcpy :

std::unique_ptr<Message> output(CreateMessage(serialStr.length()));
memcpy(output->GetData(), serialStr.c_str(), serialStr.length());

fChannels.at("data2").at(0).Send(output);

Also, is it a good idea to use an std::string to contain a binary object, or should I use a void* instead?

Answer 1

If all you are doing is forwarding then you can use the same message, you can use something like :

std::unique_ptr<Message> input(CreateMessage());
if (Receive(input, "data") > 0)
{
    fChannels.at("data2").at(0).Send(input);
}

Alternatively you can look at the 4 argument message constructor to use an existing buffer as the message payload rather than copying.