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/* Box class implementation (non-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/ . */
#include <ppl-config.h>
#include "Box.defs.hh"
namespace PPL = Parma_Polyhedra_Library;
#ifdef PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS
/*! \relates Parma_Polyhedra_Library::BD_Shape */
#endif // defined(PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS)
bool
PPL::extract_interval_constraint(const Constraint& c,
const dimension_type c_space_dim,
dimension_type& c_num_vars,
dimension_type& c_only_var) {
// Check for preconditions.
PPL_ASSERT(c.space_dimension() == c_space_dim);
PPL_ASSERT(c_num_vars == 0 && c_only_var == 0);
// Collect the non-zero components of `c'.
for (dimension_type i = c_space_dim; i-- > 0; )
if (c.coefficient(Variable(i)) != 0) {
if (c_num_vars == 0) {
c_only_var = i;
++c_num_vars;
}
else
// Constraint `c' is not an interval constraint.
return false;
}
return true;
}
bool
PPL::extract_interval_congruence(const Congruence& cg,
const dimension_type cg_space_dim,
dimension_type& cg_num_vars,
dimension_type& cg_only_var) {
// Check for preconditions.
PPL_ASSERT(cg.space_dimension() == cg_space_dim);
PPL_ASSERT(cg_num_vars == 0 && cg_only_var == 0);
// Only equality congruences can be intervals.
PPL_ASSERT(cg.is_equality());
// Collect the non-zero components of `cg'.
for (dimension_type i = cg_space_dim; i-- > 0; )
if (cg.coefficient(Variable(i)) != 0) {
if (cg_num_vars == 0) {
cg_only_var = i;
++cg_num_vars;
}
else
// Congruence `cg' is not an interval congruence.
return false;
}
return true;
}
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