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/* Box class implementation (non-inline functions).
Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
Copyright (C) 2010-2016 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://bugseng.com/products/ppl/ . */
#include "ppl-config.h"
#include "Box_defs.hh"
namespace PPL = Parma_Polyhedra_Library;
bool
PPL::Box_Helpers::extract_interval_constraint(const Constraint& c,
dimension_type& c_num_vars,
dimension_type& c_only_var) {
// Check for preconditions.
PPL_ASSERT(c_num_vars == 0 && c_only_var == 0);
c_only_var = c.expression().first_nonzero(1, c.space_dimension() + 1);
if (c_only_var == c.space_dimension() + 1) {
// All the inhomogeneous coefficients are zero.
return true;
}
++c_num_vars;
--c_only_var;
return c.expression().all_zeroes(c_only_var + 2, c.space_dimension() + 1);
}
bool
PPL::Box_Helpers::extract_interval_congruence(const Congruence& cg,
dimension_type& cg_num_vars,
dimension_type& cg_only_var) {
// Check for preconditions.
PPL_ASSERT(cg_num_vars == 0 && cg_only_var == 0);
// Only equality congruences can be intervals.
PPL_ASSERT(cg.is_equality());
cg_only_var = cg.expression().first_nonzero(1, cg.space_dimension() + 1);
if (cg_only_var == cg.space_dimension() + 1) {
// All the inhomogeneous coefficients are zero.
return true;
}
++cg_num_vars;
--cg_only_var;
return cg.expression().all_zeroes(cg_only_var + 2, cg.space_dimension() + 1);
}
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