Merge pull request #558 from drolevar/master

Add support for ZMQ_ONLY_FIRST_SUBSCRIBE option

Author: gummif

zmq.hpp

@@ -1550,6 +1550,9 @@ ZMQ_DEFINE_INTEGRAL_BOOL_UNIT_OPT(ZMQ_MULTICAST_LOOP, multicast_loop, int);
 #ifdef ZMQ_MULTICAST_MAXTPDU
 ZMQ_DEFINE_INTEGRAL_OPT(ZMQ_MULTICAST_MAXTPDU, multicast_maxtpdu, int);
 #endif
+#ifdef ZMQ_ONLY_FIRST_SUBSCRIBE
+ZMQ_DEFINE_INTEGRAL_BOOL_UNIT_OPT(ZMQ_ONLY_FIRST_SUBSCRIBE, only_first_subscribe, int);
+#endif
 #ifdef ZMQ_PLAIN_SERVER
 ZMQ_DEFINE_INTEGRAL_BOOL_UNIT_OPT(ZMQ_PLAIN_SERVER, plain_server, int);
 #endif