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diff --git a/src/ypipe_base.hpp b/src/ypipe_base.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_YPIPE_BASE_HPP_INCLUDED__
+#define __ZMQ_YPIPE_BASE_HPP_INCLUDED__
+
+
+namespace zmq
+{
+    // ypipe_base abstracts ypipe and ypipe_conflate specific
+    // classes, one is selected according to a the conflate
+    // socket option
+
+    template <typename T, int N> class ypipe_base_t
+    {
+    public:
+        virtual ~ypipe_base_t () {}
+        virtual void write (const T &value_, bool incomplete_) = 0;
+        virtual bool unwrite (T *value_) = 0;
+        virtual bool flush () = 0;
+        virtual bool check_read () = 0;
+        virtual bool read (T *value_) = 0;
+        virtual bool probe (bool (*fn)(T &)) = 0;
+    };
+}
+
+#endif