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diff --git a/interfaces/marked_pointers.hh b/interfaces/marked_pointers.hh
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+/* Implementation of marked pointers for use in some PPL non-templatic
+   language interfaces.
+   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_marked_pointers_hh
+#define PPL_marked_pointers_hh 1
+
+namespace Parma_Polyhedra_Library {
+
+#define PPL_MARKED_POINTERS_MASK ((uintptr_t) 1)
+
+/*! \brief
+  Returns the marked pointer corresponding to \p p.
+
+  The marking consists in setting the least significant bit to 1.
+*/
+template <typename T>
+inline T*
+mark(T* p) {
+  uintptr_t uint_p = reinterpret_cast<uintptr_t>(p);
+  return reinterpret_cast<T*>(uint_p | (PPL_MARKED_POINTERS_MASK));
+}
+
+//! Returns the unmarked pointer corresponding to \p p.
+template <typename T>
+inline T*
+unmark(T* p) {
+  uintptr_t uint_p = reinterpret_cast<uintptr_t>(p);
+  return reinterpret_cast<T*>(uint_p & ~(PPL_MARKED_POINTERS_MASK));
+}
+
+//! Returns <CODE>true</CODE> if and only if \p p is marked.
+template <typename T>
+inline bool
+marked(T* p) {
+  uintptr_t uint_p = reinterpret_cast<uintptr_t>(p);
+  return (uint_p & (PPL_MARKED_POINTERS_MASK)) != 0;
+}
+
+#undef PPL_MARKED_POINTERS_MASK
+
+} // namespace Parma_Polyhedra_Library
+
+#endif // !defined(PPL_marked_pointers_hh)