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diff --git a/src/xsub.hpp b/src/xsub.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_XSUB_HPP_INCLUDED__
+#define __ZMQ_XSUB_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "session_base.hpp"
+#include "dist.hpp"
+#include "fq.hpp"
+#include "trie.hpp"
+
+namespace zmq
+{
+
+    class ctx_t;
+    class pipe_t;
+    class io_thread_t;
+
+    class xsub_t :
+        public socket_base_t
+    {
+    public:
+
+        xsub_t (zmq::ctx_t *parent_, uint32_t tid_, int sid_);
+        ~xsub_t ();
+
+    protected:
+
+        //  Overloads of functions from socket_base_t.
+        void xattach_pipe (zmq::pipe_t *pipe_, bool subscribe_to_all_);
+        int xsend (zmq::msg_t *msg_);
+        bool xhas_out ();
+        int xrecv (zmq::msg_t *msg_);
+        bool xhas_in ();
+        void xread_activated (zmq::pipe_t *pipe_);
+        void xwrite_activated (zmq::pipe_t *pipe_);
+        void xhiccuped (pipe_t *pipe_);
+        void xpipe_terminated (zmq::pipe_t *pipe_);
+
+    private:
+
+        //  Check whether the message matches at least one subscription.
+        bool match (zmq::msg_t *msg_);
+
+        //  Function to be applied to the trie to send all the subsciptions
+        //  upstream.
+        static void send_subscription (unsigned char *data_, size_t size_,
+            void *arg_);
+
+        //  Fair queueing object for inbound pipes.
+        fq_t fq;
+
+        //  Object for distributing the subscriptions upstream.
+        dist_t dist;
+
+        //  The repository of subscriptions.
+        trie_t subscriptions;
+
+        //  If true, 'message' contains a matching message to return on the
+        //  next recv call.
+        bool has_message;
+        msg_t message;
+
+        //  If true, part of a multipart message was already received, but
+        //  there are following parts still waiting.
+        bool more;
+
+        xsub_t (const xsub_t&);
+        const xsub_t &operator = (const xsub_t&);
+    };
+
+}
+
+#endif
+