[zeromq-dev] XSUB/XPUB proper usage

[Kenneth Adam Miller]

There's no really complete example in the guide with source for usage of an
XSUB/XPUB combination that I could find. So I have some questions:

Suppose the following is how I set up the XPub & XSub sockets:

  _xpub = new zmq::socket_t(_context, ZMQ_XPUB);
  _xpub->bind("inproc://killpub");
  _xsub = new zmq::socket_t(_context, ZMQ_XSUB);
  _xsub->bind("inproc://killsub");

//These sockets are created and bound in the constructor of a static
singleton
//This static singleton also creates the context. It also manages their
destruction
//later ...

sub->connect("inproc://killpub");
pub->connect("inproc://killsub");

Now my questions: for xpub and xsub do you do the following:
  pub->setsockopt(ZMQ_SUBSCRIBE, "", 0);

at all? Or does the following handle it completely:
  char *s = "xsubscriptionprefix";
  s[0]='\x01';
  sub->send(s);

where messages sent by pub that start with subscriptionprefix will be
forwarded to sub?

Also is there a need for unsubscription upon closure of sub?
char *s="\x00";
sub->send(s);
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