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diff --git a/src/i_poll_events.hpp b/src/i_poll_events.hpp
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+/*
+Copyright (c) 2007-2010 iMatix Corporation
+ 
+This file is part of 0MQ.
+ 
+0MQ is free software; you can redistribute it and/or modify it under
+the terms of the Lesser GNU General Public License as published by
+the Free Software Foundation; either version 3 of the License, or
+(at your option) any later version.
+ 
+0MQ is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+Lesser GNU General Public License for more details.
+ 
+You should have received a copy of the Lesser GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+ 
+#ifndef __ZMQ_I_POLL_EVENTS_HPP_INCLUDED__
+#define __ZMQ_I_POLL_EVENTS_HPP_INCLUDED__
+ 
+namespace zmq
+{
+ 
+    // Virtual interface to be exposed by object that want to be notified
+    // about events on file descriptors.
+ 
+    struct i_poll_events
+    {
+        virtual ~i_poll_events () {};
+ 
+        // Called by I/O thread when file descriptor is ready for reading.
+        virtual void in_event () = 0;
+ 
+        // Called by I/O thread when file descriptor is ready for writing.
+        virtual void out_event () = 0;
+ 
+        // Called when timer expires.
+        virtual void timer_event () = 0;
+    };
+ 
+}
+ 
+#endif