/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /* */ /* 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 cons_sos2.h * @ingroup CONSHDLRS * @brief constraint handler for SOS type 2 constraints * @author Marc Pfetsch * */ /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/ #ifndef __SCIP_CONS_SOS2_H__ #define __SCIP_CONS_SOS2_H__ #include "scip/def.h" #include "scip/type_cons.h" #include "scip/type_retcode.h" #include "scip/type_scip.h" #include "scip/type_var.h" #ifdef __cplusplus extern "C" { #endif /** creates the handler for SOS2 constraints and includes it in SCIP * * @ingroup ConshdlrIncludes * */ SCIP_EXPORT SCIP_RETCODE SCIPincludeConshdlrSOS2( SCIP* scip /**< SCIP data structure */ ); /**@addtogroup CONSHDLRS * * @{ * * @name Specially Ordered Set (SOS) Type 2 Constraints * * @{ * * A specially ordered set of type 2 (SOS2) is a sequence of variables such that at most two * variables are nonzero and if two variables are nonzero they must be adjacent in the specified * sequence. Note that it is in principle allowed that a variable appears twice, but it then can be * fixed to 0 if it is at least two apart in the sequence. */ /** creates and captures an SOS2 constraint * * We set the constraint to not be modifable. If the weights are non * NULL, the variables are ordered according to these weights (in * ascending order). * * @note the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons() */ SCIP_EXPORT SCIP_RETCODE SCIPcreateConsSOS2( SCIP* scip, /**< SCIP data structure */ SCIP_CONS** cons, /**< pointer to hold the created constraint */ const char* name, /**< name of constraint */ int nvars, /**< number of variables in the constraint */ SCIP_VAR** vars, /**< array with variables of constraint entries */ SCIP_Real* weights, /**< weights determining the variable order, or NULL if natural order should be used */ 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 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 a SOS2 constraint with all constraint flags set to their default values. * * @warning Do NOT set the constraint to be modifiable manually, because this might lead * to wrong results as the variable array will not be resorted * * @note the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons() */ SCIP_EXPORT SCIP_RETCODE SCIPcreateConsBasicSOS2( SCIP* scip, /**< SCIP data structure */ SCIP_CONS** cons, /**< pointer to hold the created constraint */ const char* name, /**< name of constraint */ int nvars, /**< number of variables in the constraint */ SCIP_VAR** vars, /**< array with variables of constraint entries */ SCIP_Real* weights /**< weights determining the variable order, or NULL if natural order should be used */ ); /** adds variable to SOS2 constraint, the position is determined by the given weight */ SCIP_EXPORT SCIP_RETCODE SCIPaddVarSOS2( SCIP* scip, /**< SCIP data structure */ SCIP_CONS* cons, /**< constraint */ SCIP_VAR* var, /**< variable to add to the constraint */ SCIP_Real weight /**< weight determining position of variable */ ); /** appends variable to SOS2 constraint */ SCIP_EXPORT SCIP_RETCODE SCIPappendVarSOS2( SCIP* scip, /**< SCIP data structure */ SCIP_CONS* cons, /**< constraint */ SCIP_VAR* var /**< variable to add to the constraint */ ); /** gets number of variables in SOS2 constraint */ SCIP_EXPORT int SCIPgetNVarsSOS2( SCIP* scip, /**< SCIP data structure */ SCIP_CONS* cons /**< constraint */ ); /** gets array of variables in SOS2 constraint */ SCIP_EXPORT SCIP_VAR** SCIPgetVarsSOS2( SCIP* scip, /**< SCIP data structure */ SCIP_CONS* cons /**< constraint data */ ); /** gets array of weights in SOS2 constraint (or NULL if not existent) */ SCIP_EXPORT SCIP_Real* SCIPgetWeightsSOS2( SCIP* scip, /**< SCIP data structure */ SCIP_CONS* cons /**< constraint data */ ); /** @} */ /** @} */ #ifdef __cplusplus } #endif #endif