Merge pull request #33 from cosmoharrigan/proxy

Add proxy_steerable interface for zmq_proxy_steerable in versions >= 4.0.4

Author: hintjens

zmq.hpp

@@ -60,6 +60,10 @@
 #define ZMQ_NEW_MONITOR_EVENT_LAYOUT
 #endif
 
+#if ZMQ_VERSION >= ZMQ_MAKE_VERSION(4, 0, 4)
+#define ZMQ_HAS_PROXY_STEERABLE
+#endif
+
 // In order to prevent unused variable warnings when building in non-debug
 // mode use this macro to make assertions.
 #ifndef NDEBUG
@@ -109,7 +113,16 @@ namespace zmq
         if (rc != 0)
             throw error_t ();
     }
-
+    
+#ifdef ZMQ_HAS_PROXY_STEERABLE
+    inline void proxy_steerable (void *frontend, void *backend, void *capture, void *control)
+    {
+        int rc = zmq_proxy_steerable (frontend, backend, capture, control);
+        if (rc != 0)
+            throw error_t ();
+    }
+#endif
+    
     inline void version (int *major_, int *minor_, int *patch_)
     {
         zmq_version (major_, minor_, patch_);