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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_LB_HPP_INCLUDED__
+#define __ZMQ_LB_HPP_INCLUDED__
+
+#include "array.hpp"
+#include "pipe.hpp"
+
+namespace zmq
+{
+
+    //  This class manages a set of outbound pipes. On send it load balances
+    //  messages fairly among the pipes.
+
+    class lb_t
+    {
+    public:
+
+        lb_t ();
+        ~lb_t ();
+
+        void attach (pipe_t *pipe_);
+        void activated (pipe_t *pipe_);
+        void pipe_terminated (pipe_t *pipe_);
+
+        int send (msg_t *msg_);
+
+        //  Sends a message and stores the pipe that was used in pipe_.
+        //  It is possible for this function to return success but keep pipe_
+        //  unset if the rest of a multipart message to a terminated pipe is
+        //  being dropped. For the first frame, this will never happen.
+        int sendpipe (msg_t *msg_, pipe_t **pipe_);
+
+        bool has_out ();
+
+    private:
+
+        //  List of outbound pipes.
+        typedef array_t <pipe_t, 2> pipes_t;
+        pipes_t pipes;
+
+        //  Number of active pipes. All the active pipes are located at the
+        //  beginning of the pipes array.
+        pipes_t::size_type active;
+
+        //  Points to the last pipe that the most recent message was sent to.
+        pipes_t::size_type current;
+
+        //  True if last we are in the middle of a multipart message.
+        bool more;
+
+        //  True if we are dropping current message.
+        bool dropping;
+
+        lb_t (const lb_t&);
+        const lb_t &operator = (const lb_t&);
+    };
+
+}
+
+#endif