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diff --git a/src/sub.hpp b/src/sub.hpp
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+/*
+    Copyright (c) 2007-2012 iMatix Corporation
+    Copyright (c) 2009-2011 250bpm s.r.o.
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser 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
+    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_SUB_HPP_INCLUDED__
+#define __ZMQ_SUB_HPP_INCLUDED__
+
+#include "xsub.hpp"
+
+namespace zmq
+{
+
+    class ctx_t;
+    class msg_t;
+    class io_thread_t;
+    class socket_base_t;
+
+    class sub_t : public xsub_t
+    {
+    public:
+
+        sub_t (zmq::ctx_t *parent_, uint32_t tid_, int sid_);
+        ~sub_t ();
+
+    protected:
+
+        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
+        int xsend (zmq::msg_t *msg_, int flags_);
+        bool xhas_out ();
+
+    private:
+
+        sub_t (const sub_t&);
+        const sub_t &operator = (const sub_t&);
+    };
+
+    class sub_session_t : public xsub_session_t
+    {
+    public:
+
+        sub_session_t (zmq::io_thread_t *io_thread_, bool connect_,
+            zmq::socket_base_t *socket_, const options_t &options_,
+            const address_t *addr_);
+        ~sub_session_t ();
+
+    private:
+
+        sub_session_t (const sub_session_t&);
+        const sub_session_t &operator = (const sub_session_t&);
+    };
+
+}
+
+#endif