Problem: redundant old-style void argument declarations

Solution: remove

src/err.cpp

@@ -444,7 +444,7 @@ void zmq::print_backtrace (void)
 
 #else
 
-void zmq::print_backtrace (void)
+void zmq::print_backtrace ()
 {
 }
 

src/err.hpp

@@ -65,7 +65,7 @@ __declspec(noreturn) void zmq_abort (const char *errmsg_);
 #else
 void zmq_abort (const char *errmsg_);
 #endif
-void print_backtrace (void);
+void print_backtrace ();
 }
 
 #ifdef ZMQ_HAVE_WINDOWS

src/random.cpp

@@ -157,12 +157,12 @@ static void manage_random (bool init_)
 #endif
 }
 
-void zmq::random_open (void)
+void zmq::random_open ()
 {
     manage_random (true);
 }
 
-void zmq::random_close (void)
+void zmq::random_close ()
 {
     manage_random (false);
 }

src/router.cpp

@@ -369,7 +369,7 @@ int zmq::router_t::xrecv (msg_t *msg_)
     return 0;
 }
 
-int zmq::router_t::rollback (void)
+int zmq::router_t::rollback ()
 {
     if (current_out) {
         current_out->rollback ();

src/socket_poller.hpp

@@ -77,7 +77,7 @@ class socket_poller_t
 
     int wait (event_t *event_, int n_events_, long timeout_);
 
-    inline int size (void) { return static_cast<int> (items.size ()); };
+    inline int size () { return static_cast<int> (items.size ()); };
 
     //  Return false if object is not a socket.
     bool check_tag ();