branch_generic.h

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/*                  This file is part of the program                         */
/*          GCG --- Generic Column Generation                                */
/*                  a Dantzig-Wolfe decomposition based extension            */
/*                  of the branch-cut-and-price framework                    */
/*         SCIP --- Solving Constraint Integer Programs                      */
/*                                                                           */
/* Copyright (C) 2010-2021 Operations Research, RWTH Aachen University       */
/*                         Zuse Institute Berlin (ZIB)                       */
/*                                                                           */
/* This program is free software; you can redistribute it and/or             */
/* modify it under the terms of the GNU Lesser General Public License        */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             */
/* GNU Lesser General Public License for more details.                       */
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/**@file   branch_generic.h
 * @brief  branching rule based on vanderbeck's generic branching scheme
 * @author Marcel Schmickerath
 */
 
/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
 
#ifndef __SCIP_BRANCH_GENERIC_H__
#define __SCIP_BRANCH_GENERIC_H__
 
 
#include "scip/scip.h"
#include "type_branchgcg.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef enum {
   GCG_COMPSENSE_GE = 1,
   GCG_COMPSENSE_LT = 0
} GCG_COMPSENSE;
 
/** component bound structure */
struct ComponentBoundSequence
{
   SCIP_VAR*             component;          /**< variable to which this bound belongs */
   GCG_COMPSENSE         sense;              /**< sense of the bound */
   SCIP_Real             bound;              /**< bound value */
};
typedef struct ComponentBoundSequence GCG_COMPSEQUENCE;
 
/** strip structure */
struct GCG_Strip
{
   SCIP*                 scip;               /**< SCIP data structure */
   SCIP_VAR*             mastervar;          /**< master variable */
   GCG_COMPSEQUENCE**    C;                  /**< current set of comp bound sequences */
   int                   Csize;              /**< number of component bound sequences */
   int*                  sequencesizes;      /**< array of sizes of component bound sequences */
};
typedef struct GCG_Strip GCG_STRIP;
 
/** creates the generic branching rule and includes it in SCIP */
extern
SCIP_RETCODE SCIPincludeBranchruleGeneric(
   SCIP*                 scip                /**< SCIP data structure */
   );
 
/** initializes branchdata */
extern
SCIP_RETCODE GCGbranchGenericCreateBranchdata(
   SCIP*                 scip,               /**< SCIP data structure */
   GCG_BRANCHDATA**      branchdata          /**< branching data to initialize */
   );
 
/** get component bound sequence */
extern
GCG_COMPSEQUENCE* GCGbranchGenericBranchdataGetConsS(
   GCG_BRANCHDATA*       branchdata          /**< branching data to initialize */
   );
 
/** get size of component bound sequence */
extern
int GCGbranchGenericBranchdataGetConsSsize(
   GCG_BRANCHDATA*       branchdata          /**< branching data to initialize */
   );
 
/** get id of pricing problem (or block) to which the constraint belongs */
extern
int GCGbranchGenericBranchdataGetConsblocknr(
   GCG_BRANCHDATA*       branchdata          /**< branching data to initialize */
   );
 
/** get master constraint */
extern
SCIP_CONS* GCGbranchGenericBranchdataGetMastercons(
   GCG_BRANCHDATA*       branchdata          /**< branching data to initialize */
   );
 
/** prepares informations for using the generic branching scheme */
extern
SCIP_RETCODE GCGbranchGenericInitbranch(
   SCIP*                 masterscip,         /**< SCIP data structure */
   SCIP_BRANCHRULE*      branchrule,         /**< branching rule */
   SCIP_RESULT*          result,             /**< pointer to store the result of the branching call */
   int**                 checkedblocks,      /**< blocks that have been checked */
   int*                  ncheckedblocks,     /**< number of checked blocks */
   GCG_STRIP****         checkedblockssortstrips, /**< sorted strips of checked blocks */
   int**                 checkedblocksnsortstrips /**< sizes of the strips */
   );
 
/** returns true when the branch rule is the generic branchrule */
SCIP_Bool GCGisBranchruleGeneric(
   SCIP_BRANCHRULE*      branchrule          /**< branchrule to check */
);
 
#ifdef __cplusplus
}
#endif
 
#endif