cons.h

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/*                  This file is part of the program and library             */
/*         SCIP --- Solving Constraint Integer Programs                      */
/*                                                                           */
/*  Copyright (c) 2002-2023 Zuse Institute Berlin (ZIB)                      */
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/*  Licensed under the Apache License, Version 2.0 (the "License");          */
/*  you may not use this file except in compliance with the License.         */
/*  You may obtain a copy of the License at                                  */
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/*      http://www.apache.org/licenses/LICENSE-2.0                           */
/*                                                                           */
/*  Unless required by applicable law or agreed to in writing, software      */
/*  distributed under the License is distributed on an "AS IS" BASIS,        */
/*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/*  limitations under the License.                                           */
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/*  You should have received a copy of the Apache-2.0 license                */
/*  along with SCIP; see the file LICENSE. If not visit scipopt.org.         */
/*                                                                           */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**@file   cons.h
 * @ingroup INTERNALAPI
 * @brief  internal methods for constraints and constraint handlers
 * @author Tobias Achterberg
 */

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

#ifndef __SCIP_CONS_H__
#define __SCIP_CONS_H__


#include "scip/def.h"
#include "blockmemshell/memory.h"
#include "scip/type_retcode.h"
#include "scip/type_result.h"
#include "scip/type_set.h"
#include "scip/type_stat.h"
#include "scip/type_mem.h"
#include "scip/type_misc.h"
#include "scip/type_timing.h"
#include "scip/type_lp.h"
#include "scip/type_var.h"
#include "scip/type_prob.h"
#include "scip/type_sol.h"
#include "scip/type_tree.h"
#include "scip/type_sepastore.h"
#include "scip/type_cons.h"
#include "scip/type_branch.h"
#include "scip/type_reopt.h"
#include "scip/pub_cons.h"

#ifndef NDEBUG
#include "scip/struct_cons.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Constraint handler methods
 */

/** copies the given constraint handler to a new scip */
SCIP_RETCODE SCIPconshdlrCopyInclude(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_SET*             set,                /**< SCIP_SET of SCIP to copy to */
   SCIP_Bool*            valid               /**< was the copying process valid? */
   );

/** creates a constraint handler */
SCIP_RETCODE SCIPconshdlrCreate(
   SCIP_CONSHDLR**       conshdlr,           /**< pointer to constraint handler data structure */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_MESSAGEHDLR*     messagehdlr,        /**< message handler */
   BMS_BLKMEM*           blkmem,             /**< block memory for parameter settings */
   const char*           name,               /**< name of constraint handler */
   const char*           desc,               /**< description of constraint handler */
   int                   sepapriority,       /**< priority of the constraint handler for separation */
   int                   enfopriority,       /**< priority of the constraint handler for constraint enforcing */
   int                   checkpriority,      /**< priority of the constraint handler for checking feasibility (and propagation) */
   int                   sepafreq,           /**< frequency for separating cuts; zero means to separate only in the root node */
   int                   propfreq,           /**< frequency for propagating domains; zero means only preprocessing propagation */
   int                   eagerfreq,          /**< frequency for using all instead of only the useful constraints in separation,
                                              *   propagation and enforcement, -1 for no eager evaluations, 0 for first only */
   int                   maxprerounds,       /**< maximal number of presolving rounds the constraint handler participates in (-1: no limit) */
   SCIP_Bool             delaysepa,          /**< should separation method be delayed, if other separators found cuts? */
   SCIP_Bool             delayprop,          /**< should propagation method be delayed, if other propagators found reductions? */
   SCIP_Bool             needscons,          /**< should the constraint handler be skipped, if no constraints are available? */
   SCIP_PROPTIMING       proptiming,         /**< positions in the node solving loop where propagation method of constraint handlers should be executed */
   SCIP_PRESOLTIMING     presoltiming,       /**< timing mask of the constraint handler's presolving method */
   SCIP_DECL_CONSHDLRCOPY((*conshdlrcopy)),  /**< copy method of constraint handler or NULL if you don't want to copy your plugin into sub-SCIPs */
   SCIP_DECL_CONSFREE    ((*consfree)),      /**< destructor of constraint handler */
   SCIP_DECL_CONSINIT    ((*consinit)),      /**< initialize constraint handler */
   SCIP_DECL_CONSEXIT    ((*consexit)),      /**< deinitialize constraint handler */
   SCIP_DECL_CONSINITPRE ((*consinitpre)),   /**< presolving initialization method of constraint handler */
   SCIP_DECL_CONSEXITPRE ((*consexitpre)),   /**< presolving deinitialization method of constraint handler */
   SCIP_DECL_CONSINITSOL ((*consinitsol)),   /**< solving process initialization method of constraint handler */
   SCIP_DECL_CONSEXITSOL ((*consexitsol)),   /**< solving process deinitialization method of constraint handler */
   SCIP_DECL_CONSDELETE  ((*consdelete)),    /**< free specific constraint data */
   SCIP_DECL_CONSTRANS   ((*constrans)),     /**< transform constraint data into data belonging to the transformed problem */
   SCIP_DECL_CONSINITLP  ((*consinitlp)),    /**< initialize LP with relaxations of "initial" constraints */
   SCIP_DECL_CONSSEPALP  ((*conssepalp)),    /**< separate cutting planes for LP solution */
   SCIP_DECL_CONSSEPASOL ((*conssepasol)),   /**< separate cutting planes for arbitrary primal solution */
   SCIP_DECL_CONSENFOLP  ((*consenfolp)),    /**< enforcing constraints for LP solutions */
   SCIP_DECL_CONSENFORELAX ((*consenforelax)), /**< enforcing constraints for relaxation solutions */
   SCIP_DECL_CONSENFOPS  ((*consenfops)),    /**< enforcing constraints for pseudo solutions */
   SCIP_DECL_CONSCHECK   ((*conscheck)),     /**< check feasibility of primal solution */
   SCIP_DECL_CONSPROP    ((*consprop)),      /**< propagate variable domains */
   SCIP_DECL_CONSPRESOL  ((*conspresol)),    /**< presolving method */
   SCIP_DECL_CONSRESPROP ((*consresprop)),   /**< propagation conflict resolving method */
   SCIP_DECL_CONSLOCK    ((*conslock)),      /**< variable rounding lock method */
   SCIP_DECL_CONSACTIVE  ((*consactive)),    /**< activation notification method */
   SCIP_DECL_CONSDEACTIVE((*consdeactive)),  /**< deactivation notification method */
   SCIP_DECL_CONSENABLE  ((*consenable)),    /**< enabling notification method */
   SCIP_DECL_CONSDISABLE ((*consdisable)),   /**< disabling notification method */
   SCIP_DECL_CONSDELVARS ((*consdelvars)),   /**< variable deletion method */
   SCIP_DECL_CONSPRINT   ((*consprint)),     /**< constraint display method */
   SCIP_DECL_CONSCOPY    ((*conscopy)),      /**< constraint copying method */
   SCIP_DECL_CONSPARSE   ((*consparse)),     /**< constraint parsing method */
   SCIP_DECL_CONSGETVARS ((*consgetvars)),   /**< constraint get variables method */
   SCIP_DECL_CONSGETNVARS((*consgetnvars)),  /**< constraint get number of variable method */
   SCIP_DECL_CONSGETDIVEBDCHGS((*consgetdivebdchgs)), /**< constraint handler diving solution enforcement method */
   SCIP_CONSHDLRDATA*    conshdlrdata        /**< constraint handler data */
   );

/** calls destructor and frees memory of constraint handler */
SCIP_RETCODE SCIPconshdlrFree(
   SCIP_CONSHDLR**       conshdlr,           /**< pointer to constraint handler data structure */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** calls init method of constraint handler */
SCIP_RETCODE SCIPconshdlrInit(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );

/** calls exit method of constraint handler */
SCIP_RETCODE SCIPconshdlrExit(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );

/** informs constraint handler that the presolving process is being started */
SCIP_RETCODE SCIPconshdlrInitpre(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );

/** informs constraint handler that the presolving is finished */
SCIP_RETCODE SCIPconshdlrExitpre(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );

/** informs constraint handler that the branch and bound process is being started */
SCIP_RETCODE SCIPconshdlrInitsol(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );

/** informs constraint handler that the branch and bound process data is being freed */
SCIP_RETCODE SCIPconshdlrExitsol(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_Bool             restart             /**< was this exit solve call triggered by a restart? */
   );

/** calls LP initialization method of constraint handler to separate all initial active constraints */
SCIP_RETCODE SCIPconshdlrInitLP(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_TREE*            tree,               /**< branch and bound tree */
   SCIP_Bool             initkeptconss,      /**< Also initialize constraints which are valid at a more global node,
                                              *   but were not activated there? Should be FALSE for repeated calls at
                                              *   one node or if the current focusnode is a child of the former one */
   SCIP_Bool*            cutoff              /**< pointer to store whether infeasibility was detected while building the LP */
   );

/** calls separator method of constraint handler to separate LP solution */
SCIP_RETCODE SCIPconshdlrSeparateLP(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_SEPASTORE*       sepastore,          /**< separation storage */
   int                   depth,              /**< depth of current node */
   SCIP_Bool             execdelayed,        /**< execute separation method even if it is marked to be delayed */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** calls separator method of constraint handler to separate given primal solution */
SCIP_RETCODE SCIPconshdlrSeparateSol(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_SEPASTORE*       sepastore,          /**< separation storage */
   SCIP_SOL*             sol,                /**< primal solution that should be separated */
   int                   depth,              /**< depth of current node */
   SCIP_Bool             execdelayed,        /**< execute separation method even if it is marked to be delayed */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** calls enforcing method of constraint handler for a relaxation solution for all constraints added after last
 *  conshdlrResetEnfo() call
 */
SCIP_RETCODE SCIPconshdlrEnforceRelaxSol(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_TREE*            tree,               /**< branch and bound tree */
   SCIP_SEPASTORE*       sepastore,          /**< separation storage */
   SCIP_SOL*             relaxsol,           /**< solution to be enforced */
   SCIP_Bool             solinfeasible,      /**< was the solution already found out to be infeasible? */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** calls enforcing method of constraint handler for LP solution for all constraints added after last
 *  conshdlrReset() call
 */
SCIP_RETCODE SCIPconshdlrEnforceLPSol(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_TREE*            tree,               /**< branch and bound tree */
   SCIP_SEPASTORE*       sepastore,          /**< separation storage */
   SCIP_Bool             solinfeasible,      /**< was the solution already found out to be infeasible? */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** calls diving solution enforcement callback of constraint handler, if it exists */
SCIP_RETCODE SCIPconshdlrGetDiveBoundChanges(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_DIVESET*         diveset,            /**< diving settings to control scoring */
   SCIP_SOL*             sol,                /**< current solution of diving mode */
   SCIP_Bool*            success,            /**< pointer to store whether constraint handler successfully found a variable */
   SCIP_Bool*            infeasible          /**< pointer to store whether the current node was detected to be infeasible */
   );

/** calls enforcing method of constraint handler for pseudo solution for all constraints added after last
 *  conshdlrReset() call
 */
SCIP_RETCODE SCIPconshdlrEnforcePseudoSol(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_TREE*            tree,               /**< branch and bound tree */
   SCIP_BRANCHCAND*      branchcand,         /**< branching candidate storage */
   SCIP_Bool             solinfeasible,      /**< was the solution already found out to be infeasible? */
   SCIP_Bool             objinfeasible,      /**< is the solution infeasible anyway due to violating lower objective bound? */
   SCIP_Bool             forced,             /**< should enforcement of pseudo solution be forced? */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** calls feasibility check method of constraint handler */
SCIP_RETCODE SCIPconshdlrCheck(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_SOL*             sol,                /**< primal CIP solution */
   SCIP_Bool             checkintegrality,   /**< Has integrality to be checked? */
   SCIP_Bool             checklprows,        /**< Do constraints represented by rows in the current LP have to be checked? */
   SCIP_Bool             printreason,        /**< Should the reason for the violation be printed? */
   SCIP_Bool             completely,         /**< Should all violations be checked? */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** calls propagation method of constraint handler */
SCIP_RETCODE SCIPconshdlrPropagate(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   int                   depth,              /**< depth of current node; -1 if preprocessing domain propagation */
   SCIP_Bool             fullpropagation,    /**< should all constraints be propagated (or only new ones)? */
   SCIP_Bool             execdelayed,        /**< execute propagation method even if it is marked to be delayed */
   SCIP_Bool             instrongbranching,  /**< are we currently doing strong branching? */
   SCIP_PROPTIMING       proptiming,         /**< current point in the node solving process */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** calls presolving method of constraint handler */
SCIP_RETCODE SCIPconshdlrPresolve(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_PRESOLTIMING     timing,             /**< current presolving timing */
   int                   nrounds,            /**< number of presolving rounds already done */
   int*                  nfixedvars,         /**< pointer to total number of variables fixed of all presolvers */
   int*                  naggrvars,          /**< pointer to total number of variables aggregated of all presolvers */
   int*                  nchgvartypes,       /**< pointer to total number of variable type changes of all presolvers */
   int*                  nchgbds,            /**< pointer to total number of variable bounds tightened of all presolvers */
   int*                  naddholes,          /**< pointer to total number of domain holes added of all presolvers */
   int*                  ndelconss,          /**< pointer to total number of deleted constraints of all presolvers */
   int*                  naddconss,          /**< pointer to total number of added constraints of all presolvers */
   int*                  nupgdconss,         /**< pointer to total number of upgraded constraints of all presolvers */
   int*                  nchgcoefs,          /**< pointer to total number of changed coefficients of all presolvers */
   int*                  nchgsides,          /**< pointer to total number of changed left/right hand sides of all presolvers */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** enables or disables all clocks of \p conshdlr, depending on the value of the flag */
void SCIPconshdlrEnableOrDisableClocks(
   SCIP_CONSHDLR*        conshdlr,           /**< the constraint handler for which all clocks should be enabled or disabled */
   SCIP_Bool             enable              /**< should the clocks of the constraint handler be enabled? */
   );

/** calls variable deletion method of constraint handler */
SCIP_RETCODE SCIPconshdlrDelVars(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );


/** locks rounding of variables involved in the given constraint constraint handler that doesn't need constraints */
SCIP_RETCODE SCIPconshdlrLockVars(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** unlocks rounding of variables involved in the given constraint constraint handler that doesn't need constraints */
SCIP_RETCODE SCIPconshdlrUnlockVars(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/**
 * callback setter methods of constraint handlers
 */

/** sets copy method of both the constraint handler and each associated constraint */
void SCIPconshdlrSetCopy(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSHDLRCOPY((*conshdlrcopy)),  /**< copy method of constraint handler or NULL if you don't want to copy your plugin into sub-SCIPs */
   SCIP_DECL_CONSCOPY    ((*conscopy))       /**< constraint copying method */
   );

/** sets destructor method of constraint handler */
void SCIPconshdlrSetFree(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSFREE    ((*consfree))       /**< destructor of constraint handler */
   );

/** sets initialization method of constraint handler */
void SCIPconshdlrSetInit(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSINIT    ((*consinit))       /**< initialize constraint handler */
   );

/** sets deinitialization method of constraint handler */
void SCIPconshdlrSetExit(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSEXIT    ((*consexit))       /**< deinitialize constraint handler */
   );

/** sets solving process initialization method of constraint handler */
void SCIPconshdlrSetInitsol(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSINITSOL((*consinitsol))     /**< solving process initialization method of constraint handler */
   );

/** sets solving process deinitialization method of constraint handler */
void SCIPconshdlrSetExitsol(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSEXITSOL ((*consexitsol))    /**< solving process deinitialization method of constraint handler */
   );

/** sets preprocessing initialization method of constraint handler */
void SCIPconshdlrSetInitpre(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSINITPRE((*consinitpre))     /**< preprocessing initialization method of constraint handler */
   );

/** sets preprocessing deinitialization method of constraint handler */
void SCIPconshdlrSetExitpre(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSEXITPRE((*consexitpre))     /**< preprocessing deinitialization method of constraint handler */
   );

/** sets presolving method of constraint handler */
SCIP_RETCODE SCIPconshdlrSetPresol(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSPRESOL  ((*conspresol)),    /**< presolving method of constraint handler */
   int                   maxprerounds,       /**< maximal number of presolving rounds the constraint handler participates in (-1: no limit) */
   SCIP_PRESOLTIMING     presoltiming        /**< timing mask of the constraint handler's presolving method */
   );

/** sets method of constraint handler to free specific constraint data */
void SCIPconshdlrSetDelete(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSDELETE  ((*consdelete))     /**< free specific constraint data */
   );

/** sets method of constraint handler to transform constraint data into data belonging to the transformed problem */
void SCIPconshdlrSetTrans(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSTRANS   ((*constrans))      /**< transform constraint data into data belonging to the transformed problem */
   );

/** sets method of constraint handler to initialize LP with relaxations of "initial" constraints */
void SCIPconshdlrSetInitlp(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSINITLP  ((*consinitlp))     /**< initialize LP with relaxations of "initial" constraints */
   );

/** sets propagation conflict resolving method of constraint handler */
void SCIPconshdlrSetResprop(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSRESPROP ((*consresprop))    /**< propagation conflict resolving method */
   );

/** sets activation notification method of constraint handler */
void SCIPconshdlrSetActive(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSACTIVE  ((*consactive))     /**< activation notification method */
   );

/** sets deactivation notification method of constraint handler */
void SCIPconshdlrSetDeactive(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSDEACTIVE((*consdeactive))   /**< deactivation notification method */
   );

/** sets enabling notification method of constraint handler */
void SCIPconshdlrSetEnable(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSENABLE  ((*consenable))     /**< enabling notification method */
   );

/** sets disabling notification method of constraint handler */
void SCIPconshdlrSetDisable(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSDISABLE ((*consdisable))    /**< disabling notification method */
   );

/** sets variable deletion method of constraint handler */
void SCIPconshdlrSetDelvars(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSDELVARS ((*consdelvars))    /**< variable deletion method */
   );

/** sets constraint display method of constraint handler */
void SCIPconshdlrSetPrint(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSPRINT   ((*consprint))      /**< constraint display method */
   );

/** sets constraint parsing method of constraint handler */
void SCIPconshdlrSetParse(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSPARSE   ((*consparse))      /**< constraint parsing method */
   );

/** sets constraint variable getter method of constraint handler */
void SCIPconshdlrSetGetVars(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSGETVARS ((*consgetvars))    /**< constraint variable getter method */
   );

/** sets constraint variable number getter method of constraint handler */
void SCIPconshdlrSetGetNVars(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSGETNVARS((*consgetnvars))   /**< constraint variable number getter method */
   );

/** sets diving enforcement method of constraint handler */
void SCIPconshdlrSetGetDiveBdChgs(
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler */
   SCIP_DECL_CONSGETDIVEBDCHGS((*consgetdivebdchgs)) /**< constraint handler diving solution enforcement method */
   );

/*
 * Constraint set change methods
 */

/** frees constraint set change data and releases all included constraints */
SCIP_RETCODE SCIPconssetchgFree(
   SCIP_CONSSETCHG**     conssetchg,         /**< pointer to constraint set change */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** adds constraint addition to constraint set changes, and captures constraint; activates constraint if the
 *  constraint set change data is currently active
 */
SCIP_RETCODE SCIPconssetchgAddAddedCons(
   SCIP_CONSSETCHG**     conssetchg,         /**< pointer to constraint set change data structure */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_CONS*            cons,               /**< added constraint */
   int                   depth,              /**< depth of constraint set change's node */
   SCIP_Bool             focusnode,          /**< does the constraint set change belong to the focus node? */
   SCIP_Bool             active              /**< is the constraint set change currently active? */
   );

/** adds constraint disabling to constraint set changes, and captures constraint */
SCIP_RETCODE SCIPconssetchgAddDisabledCons(
   SCIP_CONSSETCHG**     conssetchg,         /**< pointer to constraint set change data structure */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_CONS*            cons                /**< disabled constraint */
   );

/** applies constraint set change */
SCIP_RETCODE SCIPconssetchgApply(
   SCIP_CONSSETCHG*      conssetchg,         /**< constraint set change to apply */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   int                   depth,              /**< depth of constraint set change's node */
   SCIP_Bool             focusnode           /**< does the constraint set change belong to the focus node? */
   );

/** undoes constraint set change */
SCIP_RETCODE SCIPconssetchgUndo(
   SCIP_CONSSETCHG*      conssetchg,         /**< constraint set change to undo */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );

/** applies constraint set change to the global problem and deletes the constraint set change data */
SCIP_RETCODE SCIPconssetchgMakeGlobal(
   SCIP_CONSSETCHG**     conssetchg,         /**< pointer to constraint set change data */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_PROB*            prob,               /**< problem data */
   SCIP_REOPT*           reopt               /**< reoptimization data */
   );

/** increase count of applied cuts */
void SCIPconshdlrIncNAppliedCuts(
   SCIP_CONSHDLR*        conshdlr            /**< constraint handler */
   );

/** increase count of found cuts */
void SCIPconshdlrIncNCutsFound(
   SCIP_CONSHDLR*        conshdlr            /**< constraint handler */
   );



/*
 * Constraint methods
 */

/** creates and captures a constraint, and inserts it into the conss array of its constraint handler
 *
 *  @warning If a constraint is marked to be checked for feasibility but not to be enforced, a LP or pseudo solution
 *  may be declared feasible even if it violates this particular constraint.
 *  This constellation should only be used, if no LP or pseudo solution can violate the constraint -- e.g. if a
 *  local constraint is redundant due to the variable's local bounds.
 */
SCIP_RETCODE SCIPconsCreate(
   SCIP_CONS**           cons,               /**< pointer to constraint */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   const char*           name,               /**< name of constraint */
   SCIP_CONSHDLR*        conshdlr,           /**< constraint handler for this constraint */
   SCIP_CONSDATA*        consdata,           /**< data for this specific 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. */
   SCIP_Bool             original,           /**< is constraint belonging to the original problem? */
   SCIP_Bool             deleteconsdata      /**< has the constraint data to be deleted if constraint is freed? */
   );

/** copies source constraint of source SCIP into the target constraint for the target SCIP, using the variable map for
 *  mapping the variables of the source SCIP to the variables of the target SCIP; if the copying process was successful
 *  a constraint is created and captured;
 *
 *  @warning If a constraint is marked to be checked for feasibility but not to be enforced, an LP or pseudo solution
 *  may be declared feasible even if it violates this particular constraint.
 *  This constellation should only be used, if no LP or pseudo solution can violate the constraint -- e.g. if a
 *  local constraint is redundant due to the variable's local bounds.
 */
SCIP_RETCODE SCIPconsCopy(
   SCIP_CONS**           cons,               /**< pointer to store the created target constraint */
   SCIP_SET*             set,                /**< global SCIP settings of the target SCIP */
   const char*           name,               /**< name of constraint, or NULL if the name of the source constraint should be used */
   SCIP*                 sourcescip,         /**< source SCIP data structure */
   SCIP_CONSHDLR*        sourceconshdlr,     /**< source constraint handler for this constraint */
   SCIP_CONS*            sourcecons,         /**< source constraint of the source SCIP */
   SCIP_HASHMAP*         varmap,             /**< a SCIP_HASHMAP mapping variables of the source SCIP to corresponding
                                              *   variables of the target SCIP */
   SCIP_HASHMAP*         consmap,            /**< a hashmap to store the mapping of source constraints to the corresponding
                                              *   target constraints, must not be NULL! */
   SCIP_Bool             initial,            /**< should the LP relaxation of constraint be in the initial LP? */
   SCIP_Bool             separate,           /**< should the constraint be separated during LP processing? */
   SCIP_Bool             enforce,            /**< should the constraint be enforced during node processing? */
   SCIP_Bool             check,              /**< should the constraint be checked for feasibility? */
   SCIP_Bool             propagate,          /**< should the constraint be propagated during node processing? */
   SCIP_Bool             local,              /**< is constraint only valid locally? */
   SCIP_Bool             modifiable,         /**< is constraint modifiable (subject to column generation)? */
   SCIP_Bool             dynamic,            /**< is constraint subject to aging? */
   SCIP_Bool             removable,          /**< should the relaxation be removed from the LP due to aging or cleanup? */
   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? */
   SCIP_Bool             global,             /**< create a global or a local copy? */
   SCIP_Bool*            valid               /**< pointer to store whether the copying was valid or not */
   );

/** parses constraint information (in cip format) out of a string; if the parsing process was successful a constraint is
 *  created, captured, and inserted into the conss array of its constraint handler.
 *
 *  @warning If a constraint is marked to be checked for feasibility but not to be enforced, an LP or pseudo solution
 *  may be declared feasible even if it violates this particular constraint.
 *  This constellation should only be used, if no LP or pseudo solution can violate the constraint -- e.g. if a
 *  local constraint is redundant due to the variable's local bounds.
 */
SCIP_RETCODE SCIPconsParse(
   SCIP_CONS**           cons,               /**< pointer to constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_MESSAGEHDLR*     messagehdlr,        /**< message handler of target SCIP */
   const char*           str,                /**< name 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. */
   SCIP_Bool*            success             /**< pointer store if the paring process was successful */
   );

/** change name of given constraint */
SCIP_RETCODE SCIPconsChgName(
   SCIP_CONS*            cons,               /**< problem constraint */
   BMS_BLKMEM*           blkmem,             /**< block memory buffer */
   const char*           name                /**< new name of constraint */
   );

/** frees a constraint and removes it from the conss array of its constraint handler */
SCIP_RETCODE SCIPconsFree(
   SCIP_CONS**           cons,               /**< constraint to free */
   BMS_BLKMEM*           blkmem,             /**< block memory buffer */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** increases usage counter of constraint */
void SCIPconsCapture(
   SCIP_CONS*            cons                /**< constraint */
   );

/** decreases usage counter of constraint, and frees memory if necessary */
SCIP_RETCODE SCIPconsRelease(
   SCIP_CONS**           cons,               /**< pointer to constraint */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set                 /**< global SCIP settings */
   );


/** outputs constraint information to file stream */
SCIP_RETCODE SCIPconsPrint(
   SCIP_CONS*            cons,               /**< constraint to print */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_MESSAGEHDLR*     messagehdlr,        /**< message handler */
   FILE*                 file                /**< output file (or NULL for standard output) */
   );

/** checks single constraint for feasibility of the given solution */
SCIP_RETCODE SCIPconsCheck(
   SCIP_CONS*            cons,               /**< constraint to check */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_SOL*             sol,                /**< primal CIP solution */
   SCIP_Bool             checkintegrality,   /**< Has integrality to be checked? */
   SCIP_Bool             checklprows,        /**< Do constraints represented by rows in the current LP have to be checked? */
   SCIP_Bool             printreason,        /**< Should the reason for the violation be printed? */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** enforces single constraint for a given pseudo solution */
SCIP_RETCODE SCIPconsEnfops(
   SCIP_CONS*            cons,               /**< constraint to enforce */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_Bool             solinfeasible,      /**< was the solution already declared infeasible by a constraint handler? */
   SCIP_Bool             objinfeasible,      /**< is the solution infeasible anyway due to violating lower objective bound? */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** enforces single constraint for a given LP solution */
SCIP_RETCODE SCIPconsEnfolp(
   SCIP_CONS*            cons,               /**< constraint to enforce */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_Bool             solinfeasible,      /**< was the solution already declared infeasible by a constraint handler? */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** enforces single constraint for a given relaxation solution */
SCIP_RETCODE SCIPconsEnforelax(
   SCIP_CONS*            cons,               /**< constraint to enforce */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_SOL*             sol,                /**< solution to be enforced */
   SCIP_Bool             solinfeasible,      /**< was the solution already declared infeasible by a constraint handler? */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** calls LP initialization method for single constraint */
SCIP_RETCODE SCIPconsInitlp(
   SCIP_CONS*            cons,               /**< constraint to initialize */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_Bool*            infeasible          /**< pointer to store whether infeasibility was detected while building the LP */
   );

/** calls separation method of single constraint for LP solution */
SCIP_RETCODE SCIPconsSepalp(
   SCIP_CONS*            cons,               /**< constraint to separate */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_RESULT*          result              /**< pointer to store the result of the separation call */
   );

/** calls separation method of single constraint for given primal solution */
SCIP_RETCODE SCIPconsSepasol(
   SCIP_CONS*            cons,               /**< constraint to separate */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_SOL*             sol,                /**< primal solution that should be separated */
   SCIP_RESULT*          result              /**< pointer to store the result of the separation call */
   );

/** calls domain propagation method of single constraint */
SCIP_RETCODE SCIPconsProp(
   SCIP_CONS*            cons,               /**< constraint to propagate */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_PROPTIMING       proptiming,         /**< current point in the node solving loop */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** resolves propagation conflict of single constraint */
SCIP_RETCODE SCIPconsResprop(
   SCIP_CONS*            cons,               /**< constraint to resolve conflict for */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_VAR*             infervar,           /**< the conflict variable whose bound change has to be resolved */
   int                   inferinfo,          /**< the user information passed to the corresponding SCIPinferVarLbCons() or SCIPinferVarUbCons() call */
   SCIP_BOUNDTYPE        boundtype,          /**< the type of the changed bound (lower or upper bound) */
   SCIP_BDCHGIDX*        bdchgidx,           /**< the index of the bound change, representing the point of time where the change took place */
   SCIP_Real             relaxedbd,          /**< the relaxed bound which is sufficient to be explained */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** presolves single constraint */
SCIP_RETCODE SCIPconsPresol(
   SCIP_CONS*            cons,               /**< constraint to presolve */
   SCIP_SET*             set,                /**< global SCIP settings */
   int                   nrounds,            /**< number of presolving rounds already done */
   SCIP_PRESOLTIMING     timing,             /**< current presolving timing */
   int                   nnewfixedvars,      /**< number of variables fixed since the last call to the presolving method */
   int                   nnewaggrvars,       /**< number of variables aggregated since the last call to the presolving method */
   int                   nnewchgvartypes,    /**< number of variable type changes since the last call to the presolving method */
   int                   nnewchgbds,         /**< number of variable bounds tightened since the last call to the presolving method */
   int                   nnewholes,          /**< number of domain holes added since the last call to the presolving method */
   int                   nnewdelconss,       /**< number of deleted constraints since the last call to the presolving method */
   int                   nnewaddconss,       /**< number of added constraints since the last call to the presolving method */
   int                   nnewupgdconss,      /**< number of upgraded constraints since the last call to the presolving method */
   int                   nnewchgcoefs,       /**< number of changed coefficients since the last call to the presolving method */
   int                   nnewchgsides,       /**< number of changed left or right hand sides since the last call to the presolving method */
   int*                  nfixedvars,         /**< pointer to count total number of variables fixed of all presolvers */
   int*                  naggrvars,          /**< pointer to count total number of variables aggregated of all presolvers */
   int*                  nchgvartypes,       /**< pointer to count total number of variable type changes of all presolvers */
   int*                  nchgbds,            /**< pointer to count total number of variable bounds tightened of all presolvers */
   int*                  naddholes,          /**< pointer to count total number of domain holes added of all presolvers */
   int*                  ndelconss,          /**< pointer to count total number of deleted constraints of all presolvers */
   int*                  naddconss,          /**< pointer to count total number of added constraints of all presolvers */
   int*                  nupgdconss,         /**< pointer to count total number of upgraded constraints of all presolvers */
   int*                  nchgcoefs,          /**< pointer to count total number of changed coefficients of all presolvers */
   int*                  nchgsides,          /**< pointer to count total number of changed left/right hand sides of all presolvers */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** calls constraint activation notification method of single constraint */
SCIP_RETCODE SCIPconsActive(
   SCIP_CONS*            cons,               /**< constraint to notify */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** calls constraint deactivation notification method of single constraint */
SCIP_RETCODE SCIPconsDeactive(
   SCIP_CONS*            cons,               /**< constraint to notify */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** method to collect the variables of a constraint
 *
 *  If the number of variables is greater than the available slots in the variable array, nothing happens except that
 *  the success point is set to FALSE. With the method SCIPgetConsNVars() it is possible to get the number of variables
 *  a constraint has in its scope.
 *
 *  @note The success pointer indicates if all variables were copied into the vars arrray.
 *
 *  @note It might be that a constraint handler does not support this functionality, in that case the success pointer is
 *        set to FALSE.
 */
SCIP_RETCODE SCIPconsGetVars(
   SCIP_CONS*            cons,               /**< constraint to print */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_VAR**            vars,               /**< array to store the involved variable of the constraint */
   int                   varssize,           /**< available slots in vars array which is needed to check if the array is large enough */
   SCIP_Bool*            success             /**< pointer to store whether the variables are successfully copied */
   );

/** method to collect the number of variables of a constraint
 *
 *  @note The success pointer indicates if the contraint handler was able to return the number of variables
 *
 *  @note It might be that a constraint handler does not support this functionality, in that case the success pointer is
 *        set to FALSE
 */
SCIP_RETCODE SCIPconsGetNVars(
   SCIP_CONS*            cons,               /**< constraint to print */
   SCIP_SET*             set,                /**< global SCIP settings */
   int*                  nvars,              /**< pointer to store the number of variables */
   SCIP_Bool*            success             /**< pointer to store whether the constraint successfully returned the number of variables */
   );

/** globally removes constraint from all subproblems; removes constraint from the constraint set change data of the
 *  node, where it was created, or from the problem, if it was a problem constraint
 */
SCIP_RETCODE SCIPconsDelete(
   SCIP_CONS*            cons,               /**< constraint to delete */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_PROB*            prob,               /**< problem data */
   SCIP_REOPT*           reopt               /**< reoptimization data */
   );

/** gets and captures transformed constraint of a given constraint; if the constraint is not yet transformed,
 *  a new transformed constraint for this constraint is created
 */
SCIP_RETCODE SCIPconsTransform(
   SCIP_CONS*            origcons,           /**< original constraint */
   BMS_BLKMEM*           blkmem,             /**< block memory buffer */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_CONS**           transcons           /**< pointer to store the transformed constraint */
   );

/** sets the initial flag of the given constraint */
SCIP_RETCODE SCIPconsSetInitial(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_Bool             initial             /**< new value */
   );

/** sets the separate flag of the given constraint */
SCIP_RETCODE SCIPconsSetSeparated(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_Bool             separate            /**< new value */
   );

/** sets the enforce flag of the given constraint */
SCIP_RETCODE SCIPconsSetEnforced(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_Bool             enforce             /**< new value */
   );

/** sets the check flag of the given constraint */
SCIP_RETCODE SCIPconsSetChecked(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_Bool             check               /**< new value */
   );

/** sets the propagate flag of the given constraint */
SCIP_RETCODE SCIPconsSetPropagated(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_Bool             propagate           /**< new value */
   );

/** sets the local flag of the given constraint */
void SCIPconsSetLocal(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_Bool             local               /**< new value */
   );

/** sets the modifiable flag of the given constraint */
void SCIPconsSetModifiable(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_Bool             modifiable          /**< new value */
   );

/** sets the dynamic flag of the given constraint */
void SCIPconsSetDynamic(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_Bool             dynamic             /**< new value */
   );

/** sets the removable flag of the given constraint */
void SCIPconsSetRemovable(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_Bool             removable           /**< new value */
   );

/** sets the stickingatnode flag of the given constraint */
void SCIPconsSetStickingAtNode(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_Bool             stickingatnode      /**< new value */
   );

/** gives the constraint a new name; ATTENTION: to old pointer is over written that might
 *  result in a memory leakage */
void SCIPconsSetNamePointer(
   SCIP_CONS*            cons,               /**< constraint */
   const char*           name                /**< new name of constraint */
   );

/** gets associated transformed constraint of an original constraint, or NULL if no associated transformed constraint
 *  exists
 */
SCIP_CONS* SCIPconsGetTransformed(
   SCIP_CONS*            cons                /**< constraint */
   );

/** activates constraint or marks constraint to be activated in next update */
SCIP_RETCODE SCIPconsActivate(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   int                   depth,              /**< depth in the tree where the constraint activation takes place, or -1 for global problem */
   SCIP_Bool             focusnode           /**< does the constraint activation take place at the focus node? */
   );

/** deactivates constraint or marks constraint to be deactivated in next update */
SCIP_RETCODE SCIPconsDeactivate(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );

/** enables constraint's separation, enforcing, and propagation capabilities or marks them to be enabled in next update */
SCIP_RETCODE SCIPconsEnable(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );

/** disables constraint's separation, enforcing, and propagation capabilities or marks them to be disabled in next update */
SCIP_RETCODE SCIPconsDisable(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat                /**< dynamic problem statistics */
   );

/** enables constraint's separation capabilities or marks them to be enabled in next update */
SCIP_RETCODE SCIPconsEnableSeparation(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** disables constraint's separation capabilities or marks them to be disabled in next update */
SCIP_RETCODE SCIPconsDisableSeparation(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** enables constraint's propagation capabilities or marks them to be enabled in next update */
SCIP_RETCODE SCIPconsEnablePropagation(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** disables constraint's propagation capabilities or marks them to be disabled in next update */
SCIP_RETCODE SCIPconsDisablePropagation(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** marks the constraint to be a conflict */
void SCIPconsMarkConflict(
   SCIP_CONS*            cons                /**< constraint */
   );

/** marks the constraint to be propagated (update might be delayed) */
SCIP_EXPORT
SCIP_RETCODE SCIPconsMarkPropagate(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** unmarks the constraint to be propagated (update might be delayed) */
SCIP_RETCODE SCIPconsUnmarkPropagate(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** adds given value to age of constraint, but age can never become negative;
 *  should be called
 *   - in constraint separation, if no cut was found for this constraint,
 *   - in constraint enforcing, if constraint was feasible, and
 *   - in constraint propagation, if no domain reduction was deduced;
 *  if it's age exceeds the constraint age limit, makes constraint obsolete or marks constraint to be made obsolete
 *  in next update
 */
SCIP_RETCODE SCIPconsAddAge(
   SCIP_CONS*            cons,               /**< constraint */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_PROB*            prob,               /**< problem data */
   SCIP_Real             deltaage,           /**< value to add to the constraint's age */
   SCIP_REOPT*           reopt               /**< reoptimization data */
   );

/** increases age of constraint by 1.0;
 *  should be called
 *   - in constraint separation, if no cut was found for this constraint,
 *   - in constraint enforcing, if constraint was feasible, and
 *   - in constraint propagation, if no domain reduction was deduced;
 *  if it's age exceeds the constraint age limit, makes constraint obsolete or marks constraint to be made obsolete
 *  in next update
 */
SCIP_RETCODE SCIPconsIncAge(
   SCIP_CONS*            cons,               /**< constraint */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_STAT*            stat,               /**< dynamic problem statistics */
   SCIP_PROB*            prob,               /**< problem data */
   SCIP_REOPT*           reopt               /**< reoptimization data */
   );

/** resets age of constraint to zero;
 *  should be called
 *   - in constraint separation, if a cut was found for this constraint,
 *   - in constraint enforcing, if the constraint was violated, and
 *   - in constraint propagation, if a domain reduction was deduced;
 *  if it was obsolete, makes constraint useful again or marks constraint to be made useful again in next update
 */
SCIP_RETCODE SCIPconsResetAge(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set                 /**< global SCIP settings */
   );

/** resolves the given conflicting bound, that was deduced by the given constraint, by putting all "reason" bounds
 *  leading to the deduction into the conflict queue with calls to SCIPaddConflictLb(), SCIPaddConflictUb(), SCIPaddConflictBd(),
 *  SCIPaddConflictRelaxedLb(), SCIPaddConflictRelaxedUb(), SCIPaddConflictRelaxedBd(), or SCIPaddConflictBinvar();
 *
 *  @note it is sufficient to explain the relaxed bound change
 */
SCIP_RETCODE SCIPconsResolvePropagation(
   SCIP_CONS*            cons,               /**< constraint that deduced the assignment */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_VAR*             infervar,           /**< variable whose bound was deduced by the constraint */
   int                   inferinfo,          /**< user inference information attached to the bound change */
   SCIP_BOUNDTYPE        inferboundtype,     /**< bound that was deduced (lower or upper bound) */
   SCIP_BDCHGIDX*        bdchgidx,           /**< bound change index, representing the point of time where change took place */
   SCIP_Real             relaxedbd,          /**< the relaxed bound */
   SCIP_RESULT*          result              /**< pointer to store the result of the callback method */
   );

/** adds given values to lock status of the constraint and updates the locks of the given locktype of the involved variables */
SCIP_RETCODE SCIPconsAddLocks(
   SCIP_CONS*            cons,               /**< constraint */
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_LOCKTYPE         locktype,           /**< type of variable locks */
   int                   nlockspos,          /**< increase in number of rounding locks for constraint */
   int                   nlocksneg           /**< increase in number of rounding locks for constraint's negation */
   );

/*
 * Hash functions
 */

/** gets the key (i.e. the name) of the given constraint */
SCIP_DECL_HASHGETKEY(SCIPhashGetKeyCons);

/*
 * method for arrays of contraint handlers
 */

/** stores all constraints marked for propagation away when probing is started */
SCIP_RETCODE SCIPconshdlrsStorePropagationStatus(
   SCIP_SET*             set,                /**< global SCIP settings */
   SCIP_CONSHDLR**       conshdlrs,          /**< all constraint handlers */
   int                   nconshdlrs          /**< number of contraint handlers */
   );

/** reset all constraints marked for propagation when probing was finished */
SCIP_RETCODE SCIPconshdlrsResetPropagationStatus(
   SCIP_SET*             set,                /**< global SCIP settings */
   BMS_BLKMEM*           blkmem,             /**< block memory */
   SCIP_CONSHDLR**       conshdlrs,          /**< all constraint handlers */
   int                   nconshdlrs          /**< number of contraint handlers */
   );

#ifdef __cplusplus
}
#endif

#endif