How to send a ZMQ message using a reference?

In the ZMQ_REQ/ZMQ_REP example a buffer is initialized and then the message is copied into it using memcpy.

Specifically:

zmq::message_t reply (5);
memcpy (reply.data (), "World", 5);
socket.send (reply);

How to reply to the message using a char pointer reference?

That is, something along the lines of:

char* text = "Hello";
zmq::message_t reply ();
socket.send (text);