scip_relax.c

Go to the documentation of this file.

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/*                  This file is part of the program and library             */
/*         SCIP --- Solving Constraint Integer Programs                      */
/*                                                                           */
/*    Copyright (C) 2002-2020 Konrad-Zuse-Zentrum                            */
/*                            fuer Informationstechnik Berlin                */
/*                                                                           */
/*  SCIP is distributed under the terms of the ZIB Academic License.         */
/*                                                                           */
/*  You should have received a copy of the ZIB Academic License              */
/*  along with SCIP; see the file COPYING. If not visit scipopt.org.         */
/*                                                                           */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**@file   scip_relax.c
 * @ingroup OTHER_CFILES
 * @brief  public methods for relaxator plugins
 * @author Tobias Achterberg
 * @author Timo Berthold
 * @author Gerald Gamrath
 * @author Leona Gottwald
 * @author Stefan Heinz
 * @author Gregor Hendel
 * @author Thorsten Koch
 * @author Alexander Martin
 * @author Marc Pfetsch
 * @author Michael Winkler
 * @author Kati Wolter
 *
 * @todo check all SCIP_STAGE_* switches, and include the new stages TRANSFORMED and INITSOLVE
 */

/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/

#include "scip/debug.h"
#include "scip/pub_message.h"
#include "scip/relax.h"
#include "scip/scip_relax.h"
#include "scip/set.h"
#include "scip/struct_mem.h"
#include "scip/struct_scip.h"
#include "scip/struct_set.h"

/** creates a relaxation handler and includes it in SCIP
 *
 *  @note method has all relaxation handler callbacks as arguments and is thus changed every time a new
 *        callback is added
 *        in future releases; consider using SCIPincludeRelaxBasic() and setter functions
 *        if you seek for a method which is less likely to change in future releases
 */
SCIP_RETCODE SCIPincludeRelax(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name,               /**< name of relaxation handler */
   const char*           desc,               /**< description of relaxation handler */
   int                   priority,           /**< priority of the relaxation handler (negative: after LP, non-negative: before LP) */
   int                   freq,               /**< frequency for calling relaxation handler */
   SCIP_DECL_RELAXCOPY   ((*relaxcopy)),     /**< copy method of relaxation handler or NULL if you don't want to copy your plugin into sub-SCIPs */
   SCIP_DECL_RELAXFREE   ((*relaxfree)),     /**< destructor of relaxation handler */
   SCIP_DECL_RELAXINIT   ((*relaxinit)),     /**< initialize relaxation handler */
   SCIP_DECL_RELAXEXIT   ((*relaxexit)),     /**< deinitialize relaxation handler */
   SCIP_DECL_RELAXINITSOL((*relaxinitsol)),  /**< solving process initialization method of relaxation handler */
   SCIP_DECL_RELAXEXITSOL((*relaxexitsol)),  /**< solving process deinitialization method of relaxation handler */
   SCIP_DECL_RELAXEXEC   ((*relaxexec)),     /**< execution method of relaxation handler */
   SCIP_RELAXDATA*       relaxdata           /**< relaxation handler data */
   )
{
   SCIP_RELAX* relax;

   SCIP_CALL( SCIPcheckStage(scip, "SCIPincludeRelax", TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE) );

   /* check whether relaxation handler is already present */
   if( SCIPfindRelax(scip, name) != NULL )
   {
      SCIPerrorMessage("relaxation handler <%s> already included.\n", name);
      return SCIP_INVALIDDATA;
   }

   SCIP_CALL( SCIPrelaxCreate(&relax, scip->set, scip->messagehdlr, scip->mem->setmem,
         name, desc, priority, freq, relaxcopy,
         relaxfree, relaxinit, relaxexit, relaxinitsol, relaxexitsol, relaxexec, relaxdata) );
   SCIP_CALL( SCIPsetIncludeRelax(scip->set, relax) );

   return SCIP_OKAY;
}

/** creates a relaxation handler and includes it in SCIP. All non fundamental
 *  (or optional) callbacks as, e.g., init and exit callbacks, will be set to NULL.
 *  Optional callbacks can be set via specific setter functions, see SCIPsetRelaxInit(), SCIPsetRelaxExit(),
 *  SCIPsetRelaxCopy(), SCIPsetRelaxFree(), SCIPsetRelaxInitsol(), and SCIPsetRelaxExitsol()
 *
 *  @note if you want to set all callbacks with a single method call, consider using SCIPincludeRelax() instead
 */
SCIP_RETCODE SCIPincludeRelaxBasic(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_RELAX**          relaxptr,           /**< reference to relaxation pointer, or NULL */
   const char*           name,               /**< name of relaxation handler */
   const char*           desc,               /**< description of relaxation handler */
   int                   priority,           /**< priority of the relaxation handler (negative: after LP, non-negative: before LP) */
   int                   freq,               /**< frequency for calling relaxation handler */
   SCIP_DECL_RELAXEXEC   ((*relaxexec)),     /**< execution method of relaxation handler */
   SCIP_RELAXDATA*       relaxdata           /**< relaxation handler data */
   )
{
   SCIP_RELAX* relax;

   SCIP_CALL( SCIPcheckStage(scip, "SCIPincludeRelaxBasic", TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE) );

   /* check whether relaxation handler is already present */
   if( SCIPfindRelax(scip, name) != NULL )
   {
      SCIPerrorMessage("relaxation handler <%s> already included.\n", name);
      return SCIP_INVALIDDATA;
   }

   SCIP_CALL( SCIPrelaxCreate(&relax, scip->set, scip->messagehdlr, scip->mem->setmem,
         name, desc, priority, freq,
         NULL, NULL, NULL, NULL, NULL, NULL, relaxexec, relaxdata) );
   SCIP_CALL( SCIPsetIncludeRelax(scip->set, relax) );

   if( relaxptr != NULL )
      *relaxptr = relax;

   return SCIP_OKAY;
}

/** sets copy method of relaxation handler */
SCIP_RETCODE SCIPsetRelaxCopy(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_RELAX*           relax,              /**< relaxation handler */
   SCIP_DECL_RELAXCOPY   ((*relaxcopy))      /**< copy method of relaxation handler or NULL if you don't want to copy your plugin into sub-SCIPs */
   )
{
   SCIP_CALL( SCIPcheckStage(scip, "SCIPsetRelaxCopy", TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE) );

   assert(relax != NULL);

   SCIPrelaxSetCopy(relax, relaxcopy);

   return SCIP_OKAY;
}

/** sets destructor method of relaxation handler */
SCIP_RETCODE SCIPsetRelaxFree(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_RELAX*           relax,              /**< relaxation handler */
   SCIP_DECL_RELAXFREE   ((*relaxfree))      /**< destructor of relaxation handler */
   )
{
   SCIP_CALL( SCIPcheckStage(scip, "SCIPsetRelaxFree", TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE) );

   assert(relax != NULL);

   SCIPrelaxSetFree(relax, relaxfree);

   return SCIP_OKAY;
}

/** sets initialization method of relaxation handler */
SCIP_RETCODE SCIPsetRelaxInit(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_RELAX*           relax,              /**< relaxation handler */
   SCIP_DECL_RELAXINIT   ((*relaxinit))      /**< initialize relaxation handler */
   )
{
   SCIP_CALL( SCIPcheckStage(scip, "SCIPsetRelaxInit", TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE) );

   assert(relax != NULL);

   SCIPrelaxSetInit(relax, relaxinit);

   return SCIP_OKAY;
}

/** sets deinitialization method of relaxation handler */
SCIP_RETCODE SCIPsetRelaxExit(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_RELAX*           relax,              /**< relaxation handler */
   SCIP_DECL_RELAXEXIT   ((*relaxexit))      /**< deinitialize relaxation handler */
   )
{
   SCIP_CALL( SCIPcheckStage(scip, "SCIPsetRelaxExit", TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE) );

   assert(relax != NULL);

   SCIPrelaxSetExit(relax, relaxexit);

   return SCIP_OKAY;
}

/** sets solving process initialization method of relaxation handler */
SCIP_RETCODE SCIPsetRelaxInitsol(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_RELAX*           relax,              /**< relaxation handler */
   SCIP_DECL_RELAXINITSOL((*relaxinitsol))   /**< solving process initialization method of relaxation handler */
   )
{
   SCIP_CALL( SCIPcheckStage(scip, "SCIPsetRelaxInitsol", TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE) );

   assert(relax != NULL);

   SCIPrelaxSetInitsol(relax, relaxinitsol);

   return SCIP_OKAY;
}

/** sets solving process deinitialization method of relaxation handler */
SCIP_RETCODE SCIPsetRelaxExitsol(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_RELAX*           relax,              /**< relaxation handler */
   SCIP_DECL_RELAXEXITSOL((*relaxexitsol))   /**< solving process deinitialization method of relaxation handler */
   )
{
   SCIP_CALL( SCIPcheckStage(scip, "SCIPsetRelaxExitsol", TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE) );

   assert(relax != NULL);

   SCIPrelaxSetExitsol(relax, relaxexitsol);

   return SCIP_OKAY;
}


/** returns the relaxation handler of the given name, or NULL if not existing */
SCIP_RELAX* SCIPfindRelax(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name                /**< name of relaxation handler */
   )
{
   assert(scip != NULL);
   assert(scip->set != NULL);
   assert(name != NULL);

   return SCIPsetFindRelax(scip->set, name);
}

/** returns the array of currently available relaxation handlers  */
SCIP_RELAX** SCIPgetRelaxs(
   SCIP*                 scip                /**< SCIP data structure */
   )
{
   assert(scip != NULL);
   assert(scip->set != NULL);

   SCIPsetSortRelaxs(scip->set);

   return scip->set->relaxs;
}

/** returns the number of currently available relaxation handlers  */
int SCIPgetNRelaxs(
   SCIP*                 scip                /**< SCIP data structure */
   )
{
   assert(scip != NULL);
   assert(scip->set != NULL);

   return scip->set->nrelaxs;
}

/** sets the priority of a relaxation handler */
SCIP_RETCODE SCIPsetRelaxPriority(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_RELAX*           relax,              /**< relaxation handler */
   int                   priority            /**< new priority of the relaxation handler */
   )
{
   assert(scip != NULL);
   assert(scip->set != NULL);

   SCIPrelaxSetPriority(relax, scip->set, priority);

   return SCIP_OKAY;
}