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diff --git a/src/pair.hpp b/src/pair.hpp
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+/*
+    Copyright (c) 2007-2013 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_PAIR_HPP_INCLUDED__
+#define __ZMQ_PAIR_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "session_base.hpp"
+
+namespace zmq
+{
+
+    class ctx_t;
+    class msg_t;
+    class pipe_t;
+    class io_thread_t;
+
+    class pair_t :
+        public socket_base_t
+    {
+    public:
+
+        pair_t (zmq::ctx_t *parent_, uint32_t tid_, int sid);
+        ~pair_t ();
+
+        //  Overloads of functions from socket_base_t.
+        void xattach_pipe (zmq::pipe_t *pipe_, bool subscribe_to_all_);
+        int xsend (zmq::msg_t *msg_);
+        int xrecv (zmq::msg_t *msg_);
+        bool xhas_in ();
+        bool xhas_out ();
+        void xread_activated (zmq::pipe_t *pipe_);
+        void xwrite_activated (zmq::pipe_t *pipe_);
+        void xpipe_terminated (zmq::pipe_t *pipe_);
+
+    private:
+
+        zmq::pipe_t *pipe;
+
+        pair_t (const pair_t&);
+        const pair_t &operator = (const pair_t&);
+    };
+
+}
+
+#endif