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diff --git a/src/Slow_Copy.hh b/src/Slow_Copy.hh
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+/* Basic Slow_Copy classes declarations.
+   Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
+   Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
+
+This file is part of the Parma Polyhedra Library (PPL).
+
+The PPL is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The PPL 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 General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
+
+For the most up-to-date information see the Parma Polyhedra Library
+site: http://www.cs.unipr.it/ppl/ . */
+
+#ifndef PPL_Slow_Copy_hh
+#define PPL_Slow_Copy_hh 1
+
+#include "meta_programming.hh"
+#include <gmpxx.h>
+
+namespace Parma_Polyhedra_Library {
+
+#ifdef PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS
+/*! \ingroup PPL_CXX_interface
+  Copies are not slow by default.
+*/
+#endif // defined(PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS)
+template <typename T>
+struct Slow_Copy : public False {
+};
+
+#ifdef PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS
+/*! \ingroup PPL_CXX_interface
+  Copies are slow for mpz_class objects.
+*/
+#endif // defined(PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS)
+template <>
+struct Slow_Copy<mpz_class> : public True {
+};
+
+#ifdef PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS
+/*! \ingroup PPL_CXX_interface
+  Copies are slow for mpq_class objects.
+*/
+#endif // defined(PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS)
+template <>
+struct Slow_Copy<mpq_class> : public True {
+};
+
+} // namespace Parma_Polyhedra_Library
+
+#endif // !defined(PPL_Slow_Copy_hh)