SCIP Doxygen Documentation: cons

All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 /*                                                                           */
 /*                  This file is part of the program and library             */
 /*         SCIP --- Solving Constraint Integer Programs                      */
 /*                                                                           */
 /*    Copyright (C) 2002-2015 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 email to scip@zib.de.      */
 /*                                                                           */
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 /**@file   cons_and.h
  * @ingroup CONSHDLRS
  * @brief  Constraint handler for "and" constraints,  \f$r = x_1 \wedge x_2 \wedge \dots  \wedge x_n\f$
  * @author Tobias Achterberg
  * @author Stefan Heinz
  * @author Michael Winkler
  *
  * This constraint handler deals with "and" constraint. These are constraint of the form:
  *
  * \f[
  *    r = x_1 \wedge x_2 \wedge \dots  \wedge x_n
  * \f]
  *
  * where \f$x_i\f$ is a binary variable for all \f$i\f$. Hence, \f$r\f$ is also of binary type. The variable \f$r\f$ is
  * called resultant and the \f$x\f$'s operators.
  */
 
 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
 
 #ifndef __SCIP_CONS_AND_H__
 #define __SCIP_CONS_AND_H__
 
 
 #include "scip/scip.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /** creates the handler for and constraints and includes it in SCIP */
 extern
 SCIP_RETCODE SCIPincludeConshdlrAnd(
    SCIP*                 scip                /**< SCIP data structure */
    );
 
 /** creates and captures an and constraint
  *
  *  @note the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()
  */
 extern
 SCIP_RETCODE SCIPcreateConsAnd(
    SCIP*                 scip,               /**< SCIP data structure */
    SCIP_CONS**           cons,               /**< pointer to hold the created constraint */
    const char*           name,               /**< name of constraint */
    SCIP_VAR*             resvar,             /**< resultant variable of the operation */
    int                   nvars,              /**< number of operator variables in the constraint */
    SCIP_VAR**            vars,               /**< array with operator variables of constraint */
    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             separate,           /**< should the constraint be separated during LP processing?
                                               *   Usually set to TRUE. */
    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             propagate,          /**< should the constraint be propagated during node processing?
                                               *   Usually set to TRUE. */
    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. */
    SCIP_Bool             removable,          /**< should the relaxation be removed from the LP due to aging or cleanup?
                                               *   Usually set to FALSE. Set to TRUE for 'lazy constraints' and 'user cuts'. */
    SCIP_Bool             stickingatnode      /**< should the constraint always be kept at the node where it was added, even
                                               *   if it may be moved to a more global node?
                                               *   Usually set to FALSE. Set to TRUE to for constraints that represent node data. */
    );
 
 /** creates and captures an and constraint
  *  in its most basic version, i. e., all constraint flags are set to their basic value as explained for the
  *  method SCIPcreateConsAnd(); all flags can be set via SCIPsetConsFLAGNAME-methods in scip.h
  *
  *  @see SCIPcreateConsAnd() 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 SCIPcreateConsBasicAnd(
    SCIP*                 scip,               /**< SCIP data structure */
    SCIP_CONS**           cons,               /**< pointer to hold the created constraint */
    const char*           name,               /**< name of constraint */
    SCIP_VAR*             resvar,             /**< resultant variable of the operation */
    int                   nvars,              /**< number of operator variables in the constraint */
    SCIP_VAR**            vars                /**< array with operator variables of constraint */
    );
 
 /** gets number of variables in and constraint */
 extern
 int SCIPgetNVarsAnd(
    SCIP*                 scip,               /**< SCIP data structure */
    SCIP_CONS*            cons                /**< constraint data */
    );
 
 /** gets array of variables in and constraint */
 extern
 SCIP_VAR** SCIPgetVarsAnd(
    SCIP*                 scip,               /**< SCIP data structure */
    SCIP_CONS*            cons                /**< constraint data */
    );
 
 /** gets the resultant variable in and constraint */
 extern
 SCIP_VAR* SCIPgetResultantAnd(
    SCIP*                 scip,               /**< SCIP data structure */
    SCIP_CONS*            cons                /**< constraint data */
    );
 
 /** return if the variables of the and-constraint are sorted due to their indices */
 extern
 SCIP_Bool SCIPisAndConsSorted(
    SCIP*                 scip,               /**< SCIP data structure */
    SCIP_CONS*            cons                /**< and-constraint */
    );
 
 /** sort the variables of the and-constraint due to their indices */
 extern
 SCIP_RETCODE SCIPsortAndCons(
    SCIP*                 scip,               /**< SCIP data structure */
    SCIP_CONS*            cons                /**< and-constraint */
    );
 
 /** when 'upgrading' the given and-constraint, should the check flag for the upgraded constraint be set to TRUE, even if
  *  the check flag of this and-constraint is set to FALSE?
  */
 extern
 SCIP_RETCODE SCIPchgAndConsCheckFlagWhenUpgr(
    SCIP*                 scip,               /**< SCIP data structure */
    SCIP_CONS*            cons,               /**< constraint data */
    SCIP_Bool             flag                /**< should an arising constraint from the given and-constraint be checked,
                                               *   even if the check flag of the and-constraint is set to FALSE
                                               */
    );
 
 /** when 'upgrading' the given and-constraint, should the removable flag for the upgraded constraint be set to FALSE,
  *  even if the removable flag of this and-constraint is set to TRUE?
  */
 extern
 SCIP_RETCODE SCIPchgAndConsRemovableFlagWhenUpgr(
    SCIP*                 scip,               /**< SCIP data structure */
    SCIP_CONS*            cons,               /**< constraint data */
    SCIP_Bool             flag                /**< should an arising constraint from the given and-constraint be not
                                               *   removable, even if the removable flag of the and-constraint is set to
                                               *   TRUE
                                               */
    );
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif