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diff --git a/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/i_engine.hpp b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/i_engine.hpp
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+/*
+    Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq 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 GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_I_ENGINE_HPP_INCLUDED__
+#define __ZMQ_I_ENGINE_HPP_INCLUDED__
+
+namespace zmq
+{
+
+    class io_thread_t;
+
+    //  Abstract interface to be implemented by various engines.
+
+    struct i_engine
+    {
+        virtual ~i_engine () {}
+
+        //  Plug the engine to the session.
+        virtual void plug (zmq::io_thread_t *io_thread_,
+            class session_base_t *session_) = 0;
+
+        //  Terminate and deallocate the engine. Note that 'detached'
+        //  events are not fired on termination.
+        virtual void terminate () = 0;
+
+        //  This method is called by the session to signalise that more
+        //  messages can be written to the pipe.
+        virtual void restart_input () = 0;
+
+        //  This method is called by the session to signalise that there
+        //  are messages to send available.
+        virtual void restart_output () = 0;
+
+        virtual void zap_msg_available () = 0;
+    };
+
+}
+
+#endif