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diff --git a/src/Poly_Gen_Relation.inlines.hh b/src/Poly_Gen_Relation.inlines.hh
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+/* Poly_Gen_Relation class implementation: inline functions.
+   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_Poly_Gen_Relation_inlines_hh
+#define PPL_Poly_Gen_Relation_inlines_hh 1
+
+namespace Parma_Polyhedra_Library {
+
+inline
+Poly_Gen_Relation::Poly_Gen_Relation(flags_t mask)
+  : flags(mask) {
+}
+
+inline Poly_Gen_Relation::flags_t
+Poly_Gen_Relation::get_flags() const {
+  return flags;
+}
+
+inline Poly_Gen_Relation
+Poly_Gen_Relation::nothing() {
+  return Poly_Gen_Relation(NOTHING);
+}
+
+inline Poly_Gen_Relation
+Poly_Gen_Relation::subsumes() {
+  return Poly_Gen_Relation(SUBSUMES);
+}
+
+inline bool
+Poly_Gen_Relation::implies(flags_t x, flags_t y) {
+  return (x & y) == y;
+}
+
+inline bool
+Poly_Gen_Relation::implies(const Poly_Gen_Relation& y) const {
+  return implies(flags, y.flags);
+}
+
+/*! \relates Poly_Gen_Relation */
+inline bool
+operator==(const Poly_Gen_Relation& x, const Poly_Gen_Relation& y) {
+  return x.flags == y.flags;
+}
+
+/*! \relates Poly_Gen_Relation */
+inline bool
+operator!=(const Poly_Gen_Relation& x, const Poly_Gen_Relation& y) {
+  return x.flags != y.flags;
+}
+
+/*! \relates Poly_Gen_Relation */
+inline Poly_Gen_Relation
+operator&&(const Poly_Gen_Relation& x, const Poly_Gen_Relation& y) {
+  return Poly_Gen_Relation(x.flags | y.flags);
+}
+
+/*! \relates Poly_Gen_Relation */
+inline Poly_Gen_Relation
+operator-(const Poly_Gen_Relation& x, const Poly_Gen_Relation& y) {
+  return Poly_Gen_Relation(x.flags & ~y.flags);
+}
+
+} // namespace Parma_Polyhedra_Library
+
+#endif // !defined(PPL_Poly_Gen_Relation_inlines_hh)