prop_pseudoobj.h

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/**@file   prop_pseudoobj.h
 * @ingroup PROPAGATORS
 * @brief  Pseudo objective propagator
 * @author Tobias Achterberg
 * @author Stefan Heinz
 *
 * This propagator propagates the objective function using the cutoff bound and the pseudo objective value. The pseudo
 * objective value can be seen as minimum activity of the linear objective function. Using this, this propagator checks
 * if variables with non-zero objective coefficients can exceed the cutoff bound. If this is the case the corresponding
 * bound can be tightened.
 */
 
/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
 
#ifndef __SCIP_PROP_PSEUDOOBJ_H__
#define __SCIP_PROP_PSEUDOOBJ_H__
 
#include "scip/def.h"
#include "scip/type_prop.h"
#include "scip/type_retcode.h"
#include "scip/type_scip.h"
#include "scip/type_var.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
/** creates the pseudo objective function propagator and includes it in SCIP
 *
 * @ingroup PropagatorIncludes
 */
SCIP_EXPORT
SCIP_RETCODE SCIPincludePropPseudoobj(
   SCIP*                 scip                /**< SCIP data structure */
   );
 
/**@addtogroup PROPAGATORS
  *
  * @{
  */
 
/** propagates the cutoff bound for the given variables */
SCIP_EXPORT
SCIP_RETCODE SCIPpropagateCutoffboundVar(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_PROP*            prop,               /**< propagator, or NULL */
   SCIP_VAR*             var,                /**< variables to propagate */
   SCIP_Real             cutoffbound,        /**< cutoff bound to use */
   SCIP_Real             pseudoobjval,       /**< pseudo objective value to use */
   SCIP_Bool*            tightened           /**< pointer to if the domain was tightened */
   );
 
/** @} */
 
#ifdef __cplusplus
}
#endif
 
#endif