sc_janus_feasibility.c

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/*
 
  $Id: sc_janus_feasibility.c 1641 2016-03-02 08:20:19Z coelho $
 
  Copyright 1989-2016 MINES ParisTech
 
  This file is part of Linear/C3 Library.
 
  Linear/C3 Library is free software: you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  any later version.
 
  Linear/C3 Library 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 Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public License
  along with Linear/C3 Library.  If not, see <http://www.gnu.org/licenses/>.
 
*/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
 
#include "boolean.h"
#include "arithmetique.h"
#include "vecteur.h"
#include "contrainte.h"
#include "sc.h"
#include "sc-private.h"
 
/**
 * Fallback function to compute feasibility with Janus, used when no custom
 * function is set.
 */
bool sc_janus_feasibility_fallback(Psysteme sc __attribute__((unused))) 
{ 
        return true;
}
 
/**
 * Internal pointer to a custom Janus feasibility function. Is null when none
 * is set.
 */
static bool (*sc_janus_feasibility_ptr)(Psysteme) = NULL;
 
/**
 * Compute feasibility, using custom Janus function if set, fallback function
 * otherwise.
 */
bool sc_janus_feasibility(Psysteme sc)
{
        if (sc_janus_feasibility_ptr != NULL) {
                return sc_janus_feasibility_ptr(sc);
        }
        else {
                return sc_janus_feasibility_fallback(sc);
        }
}
 
/**
 * Set custom Janus feasibility function.
 */
void set_sc_janus_feasibility(bool (*sc_janus_feasibility_fct)(Psysteme))
{
        sc_janus_feasibility_ptr = sc_janus_feasibility_fct;
}