make sure onLost and onDetached are always called

include/amqpcpp/linux_tcp/tcpconnection.h

@@ -231,7 +231,8 @@ public:
      *  pending operations are completed, and then an AMQP closing-handshake is
      *  performed. If you pass a parameter "immediate=true" the connection is 
      *  immediately closed, without waiting for earlier commands (and your handler's
-     *  onError() method is called about the premature close)
+     *  onError() method is called about the premature close, including the onLost() and
+     *  onDetached()).
      *  @return bool
      */
     bool close(bool immediate = false);

src/linux_tcp/tcpconnection.cpp

@@ -118,7 +118,8 @@ void TcpConnection::process(int fd, int flags)
 }
 
 /**
- *  Close the connection
+ *  Close the connection. 
+ *  Warning: this potentially directly calls several handlers (onError, onLost, onDetached)
  *  @return bool
  */
 bool TcpConnection::close(bool immediate)
@@ -140,10 +141,17 @@ bool TcpConnection::close(bool immediate)
 
     // stop if object was destructed
     if (!monitor.valid()) return true;
-    
+
+    // also call the lost handler, we have now lost the connection from this state (since we force-closed). 
+    // this makes sure the onLost and onDetached is properly called.
+    onLost(_state.get());
+
+    // stop if object was destructed
+    if (!monitor.valid()) return true;
+
     // change the state
     _state.reset(new TcpClosed(this));
-    
+
     // done, we return true because the connection is closed
     return true;
 }