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diff --git a/src/req.hpp b/src/req.hpp
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+++ b/src/req.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_REQ_HPP_INCLUDED__
+#define __ZMQ_REQ_HPP_INCLUDED__
+
+#include "dealer.hpp"
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    class ctx_t;
+    class msg_t;
+    class io_thread_t;
+    class socket_base_t;
+
+    class req_t : public dealer_t
+    {
+    public:
+
+        req_t (zmq::ctx_t *parent_, uint32_t tid_, int sid_);
+        ~req_t ();
+
+        //  Overloads of functions from socket_base_t.
+        int xsend (zmq::msg_t *msg_);
+        int xrecv (zmq::msg_t *msg_);
+        bool xhas_in ();
+        bool xhas_out ();
+        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
+        void xpipe_terminated (zmq::pipe_t *pipe_);
+
+    protected:
+
+        //  Receive only from the pipe the request was sent to, discarding
+        //  frames from other pipes.
+        int recv_reply_pipe (zmq::msg_t *msg_);
+
+    private:
+
+        //  If true, request was already sent and reply wasn't received yet or
+        //  was raceived partially.
+        bool receiving_reply;
+
+        //  If true, we are starting to send/recv a message. The first part
+        //  of the message must be empty message part (backtrace stack bottom).
+        bool message_begins;
+
+        //  The pipe the request was sent to and where the reply is expected.
+        zmq::pipe_t *reply_pipe;
+
+        //  Whether request id frames shall be sent and expected.
+        bool request_id_frames_enabled;
+
+        //  The current request id. It is incremented every time before a new
+        //  request is sent.
+        uint32_t request_id;
+
+        //  If false, send() will reset its internal state and terminate the
+        //  reply_pipe's connection instead of failing if a previous request is
+        //  still pending.
+        bool strict;
+
+        req_t (const req_t&);
+        const req_t &operator = (const req_t&);
+    };
+
+    class req_session_t : public session_base_t
+    {
+    public:
+
+        req_session_t (zmq::io_thread_t *io_thread_, bool connect_,
+            zmq::socket_base_t *socket_, const options_t &options_,
+            const address_t *addr_);
+        ~req_session_t ();
+
+        //  Overloads of the functions from session_base_t.
+        int push_msg (msg_t *msg_);
+        void reset ();
+
+    private:
+
+        enum {
+            bottom,
+            body
+        } state;
+
+        req_session_t (const req_session_t&);
+        const req_session_t &operator = (const req_session_t&);
+    };
+
+}
+
+#endif