cons_disjunction.h

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/*                  This file is part of the program and library             */
/*         SCIP --- Solving Constraint Integer Programs                      */
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/*    Copyright (C) 2002-2016 Konrad-Zuse-Zentrum                            */
/*                            fuer Informationstechnik Berlin                */
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/*  SCIP is distributed under the terms of the ZIB Academic License.         */
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**@file cons_disjunction.h
 * @ingroup CONSHDLRS
 * @brief  constraint handler for disjunction constraints
 * @author Stefan Heinz
 * @author Michael Winkler
 *
 * A disjunction constraint \f$ C \f$ is a constraint of the form
 * \f[
 *   C = C_1 \vee \dots \vee C_n
 * \f]
 *  where all the \f$ C_i \f$ are individual constraints themselves.
 */

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

#ifndef __SCIP_CONS_DISJUNCTION_H__
#define __SCIP_CONS_DISJUNCTION_H__


#include "scip/scip.h"

#ifdef __cplusplus
extern "C" {
#endif

/** creates the handler for disjunction constraints and includes it in SCIP */
extern
SCIP_RETCODE SCIPincludeConshdlrDisjunction(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** creates and captures a disjunction constraint
 *
 *  @note the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()
 */
extern
SCIP_RETCODE SCIPcreateConsDisjunction(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_CONS**           cons,               /**< pointer to hold the created constraint */
   const char*           name,               /**< name of constraint */
   int                   nconss,             /**< number of initial constraints in disjunction */
   SCIP_CONS**           conss,              /**< initial constraint in disjunction */
   SCIP_CONS*            relaxcons,          /**< a conjunction constraint containing the linear relaxation of the disjunction constraint, or NULL */
   SCIP_Bool             initial,            /**< should the LP relaxation of constraint be in the initial LP?
                                              *   Usually set to TRUE. Set to FALSE for 'lazy constraints'. */
   SCIP_Bool             enforce,            /**< should the constraint be enforced during node processing?
                                              *   TRUE for model constraints, FALSE for additional, redundant constraints. */
   SCIP_Bool             check,              /**< should the constraint be checked for feasibility?
                                              *   TRUE for model constraints, FALSE for additional, redundant constraints. */
   SCIP_Bool             local,              /**< is constraint only valid locally?
                                              *   Usually set to FALSE. Has to be set to TRUE, e.g., for branching constraints. */
   SCIP_Bool             modifiable,         /**< is constraint modifiable (subject to column generation)?
                                              *   Usually set to FALSE. In column generation applications, set to TRUE if pricing
                                              *   adds coefficients to this constraint. */
   SCIP_Bool             dynamic             /**< is constraint subject to aging?
                                              *   Usually set to FALSE. Set to TRUE for own cuts which
                                              *   are separated as constraints. */
   );

/** creates and captures a cumulative constraint
 *  in its most basic version, i. e., all constraint flags are set to their basic value as explained for the
 *  method SCIPcreateConsDisjunction(); all flags can be set via SCIPsetConsFLAGNAME-methods in scip.h
 *
 *  @see SCIPcreateConsDisjunction() for information about the basic constraint flag configuration
 *
 *  @note the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()
 */
extern
SCIP_RETCODE SCIPcreateConsBasicDisjunction(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_CONS**           cons,               /**< pointer to hold the created constraint */
   const char*           name,               /**< name of constraint */
   int                   nconss,             /**< number of initial constraints in disjunction */
   SCIP_CONS**           conss,              /**< initial constraint in disjunction */
   SCIP_CONS*            relaxcons           /**< a conjunction constraint containing the linear relaxation of the disjunction constraint, or NULL */
   );

/** adds constraint to the disjunction of constraints */
extern
SCIP_RETCODE SCIPaddConsElemDisjunction(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_CONS*            cons,               /**< disjunction constraint */
   SCIP_CONS*            addcons             /**< additional constraint in disjunction */
   );

#ifdef __cplusplus
}
#endif

#endif