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diff --git a/src/xpub.hpp b/src/xpub.hpp
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+/*
+    Copyright (c) 2010-2011 250bpm s.r.o.
+    Copyright (c) 2010-2011 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_XPUB_HPP_INCLUDED__
+#define __ZMQ_XPUB_HPP_INCLUDED__
+
+#include <deque>
+#include <string>
+
+#include "socket_base.hpp"
+#include "session_base.hpp"
+#include "mtrie.hpp"
+#include "array.hpp"
+#include "dist.hpp"
+
+namespace zmq
+{
+
+    class ctx_t;
+    class msg_t;
+    class pipe_t;
+    class io_thread_t;
+
+    class xpub_t :
+        public socket_base_t
+    {
+    public:
+
+        xpub_t (zmq::ctx_t *parent_, uint32_t tid_, int sid_);
+        ~xpub_t ();
+
+        //  Implementations of virtual functions from socket_base_t.
+        void xattach_pipe (zmq::pipe_t *pipe_, bool icanhasall_ = false);
+        int xsend (zmq::msg_t *msg_, int flags_);
+        bool xhas_out ();
+        int xrecv (zmq::msg_t *msg_, int flags_);
+        bool xhas_in ();
+        void xread_activated (zmq::pipe_t *pipe_);
+        void xwrite_activated (zmq::pipe_t *pipe_);
+        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
+        void xterminated (zmq::pipe_t *pipe_);
+
+    private:
+
+        //  Function to be applied to the trie to send all the subsciptions
+        //  upstream.
+        static void send_unsubscription (unsigned char *data_, size_t size_,
+            void *arg_);
+
+        //  Function to be applied to each matching pipes.
+        static void mark_as_matching (zmq::pipe_t *pipe_, void *arg_);
+
+        //  List of all subscriptions mapped to corresponding pipes.
+        mtrie_t subscriptions;
+
+        //  Distributor of messages holding the list of outbound pipes.
+        dist_t dist;
+
+        // If true, send all subscription messages upstream, not just
+        // unique ones
+        bool verbose;
+
+        //  True if we are in the middle of sending a multi-part message.
+        bool more;
+
+        //  List of pending (un)subscriptions, ie. those that were already
+        //  applied to the trie, but not yet received by the user.
+        typedef std::basic_string <unsigned char> blob_t;
+        typedef std::deque <blob_t> pending_t;
+        pending_t pending;
+
+        xpub_t (const xpub_t&);
+        const xpub_t &operator = (const xpub_t&);
+    };
+
+    class xpub_session_t : public session_base_t
+    {
+    public:
+
+        xpub_session_t (zmq::io_thread_t *io_thread_, bool connect_,
+            socket_base_t *socket_, const options_t &options_,
+            const address_t *addr_);
+        ~xpub_session_t ();
+
+    private:
+
+        xpub_session_t (const xpub_session_t&);
+        const xpub_session_t &operator = (const xpub_session_t&);
+    };
+
+}
+
+#endif