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diff --git a/src/Variable.inlines.hh b/src/Variable.inlines.hh
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+/* Variable 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_Variable_inlines_hh
+#define PPL_Variable_inlines_hh 1
+
+#include "globals.defs.hh"
+#include <stdexcept>
+
+namespace Parma_Polyhedra_Library {
+
+inline dimension_type
+Variable::max_space_dimension() {
+  return not_a_dimension() - 1;
+}
+
+inline
+Variable::Variable(dimension_type i)
+  : varid(i < max_space_dimension()
+	  ? i
+	  : (throw std::length_error("PPL::Variable::Variable(i):\n"
+				     "i exceeds the maximum allowed "
+				     "variable identifier."), i)) {
+}
+
+inline dimension_type
+Variable::id() const {
+  return varid;
+}
+
+inline dimension_type
+Variable::space_dimension() const {
+  return varid + 1;
+}
+
+inline memory_size_type
+Variable::external_memory_in_bytes() const {
+  return 0;
+}
+
+inline memory_size_type
+Variable::total_memory_in_bytes() const {
+  return sizeof(*this) + external_memory_in_bytes();
+}
+
+inline void
+Variable::set_output_function(output_function_type* p) {
+  current_output_function = p;
+}
+
+inline Variable::output_function_type*
+Variable::get_output_function() {
+  return current_output_function;
+}
+
+/*! \relates Variable */
+inline bool
+less(const Variable v, const Variable w) {
+  return v.id() < w.id();
+}
+
+inline bool
+Variable::Compare::operator()(const Variable x, const Variable y) const {
+  return less(x, y);
+}
+
+} // namespace Parma_Polyhedra_Library
+
+#endif // !defined(PPL_Variable_inlines_hh)