Detailed Description

constraint handler for disjunction constraints

Author: Stefan Heinz; Michael Winkler

#include <assert.h>
#include <string.h>
#include <limits.h>
#include "scip/cons_disjunction.h"

Macros
#define	CONSHDLR_NAME "disjunction"

#define	CONSHDLR_DESC "disjunction of constraints (or(cons1, cons2, ..., consn))"

#define	CONSHDLR_ENFOPRIORITY -950000

#define	CONSHDLR_CHECKPRIORITY -900000

#define	CONSHDLR_PROPFREQ -1

#define	CONSHDLR_EAGERFREQ 100

#define	CONSHDLR_MAXPREROUNDS -1

#define	CONSHDLR_DELAYPROP FALSE

#define	CONSHDLR_NEEDSCONS TRUE

#define	CONSHDLR_PRESOLTIMING SCIP_PRESOLTIMING_FAST

#define	CONSHDLR_PROP_TIMING SCIP_PROPTIMING_BEFORELP

#define	DEFAULT_ALWAYSBRANCH TRUE

Functions
static SCIP_RETCODE	consdataCreate (SCIP scip, SCIP_CONSDATA consdata, SCIP_CONS conss, int nconss, SCIP_CONS relaxcons)

static SCIP_RETCODE	consdataFree (SCIP scip, SCIP_CONSDATA *consdata)

static SCIP_RETCODE	consdataAddCons (SCIP scip, SCIP_CONSDATA consdata, SCIP_CONS *cons)

static SCIP_RETCODE	branchCons (SCIP scip, SCIP_CONS cons, SCIP_RESULT *result)

static SCIP_RETCODE	checkCons (SCIP scip, SCIP_CONS cons, SCIP_SOL sol, SCIP_Bool checkintegrality, SCIP_Bool checklprows, SCIP_Bool printreason, SCIP_RESULT result)

static SCIP_RETCODE	propagateCons (SCIP scip, SCIP_CONS cons, int *ndelconss)

static SCIP_RETCODE	enforceConstraint (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONS *conss, int nconss, SCIP_RESULT result)

static	SCIP_DECL_CONSHDLRCOPY (conshdlrCopyDisjunction)

static	SCIP_DECL_CONSFREE (consFreeDisjunction)

static	SCIP_DECL_CONSDELETE (consDeleteDisjunction)

static	SCIP_DECL_CONSTRANS (consTransDisjunction)

static	SCIP_DECL_CONSINITLP (consInitlpDisjunction)

static	SCIP_DECL_CONSENFOLP (consEnfolpDisjunction)

static	SCIP_DECL_CONSENFORELAX (consEnforelaxDisjunction)

static	SCIP_DECL_CONSENFOPS (consEnfopsDisjunction)

static	SCIP_DECL_CONSCHECK (consCheckDisjunction)

static	SCIP_DECL_CONSPROP (consPropDisjunction)

static	SCIP_DECL_CONSPRESOL (consPresolDisjunction)

static	SCIP_DECL_CONSLOCK (consLockDisjunction)

static	SCIP_DECL_CONSPRINT (consPrintDisjunction)

static	SCIP_DECL_CONSPARSE (consParseDisjunction)

static	SCIP_DECL_CONSCOPY (consCopyDisjunction)

SCIP_RETCODE	SCIPincludeConshdlrDisjunction (SCIP *scip)

SCIP_RETCODE	SCIPcreateConsDisjunction (SCIP scip, SCIP_CONS cons, const char name, int nconss, SCIP_CONS *conss, SCIP_CONS relaxcons, SCIP_Bool initial, SCIP_Bool enforce, SCIP_Bool check, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool dynamic)

SCIP_RETCODE	SCIPcreateConsBasicDisjunction (SCIP scip, SCIP_CONS cons, const char name, int nconss, SCIP_CONS *conss, SCIP_CONS relaxcons)

SCIP_RETCODE	SCIPaddConsElemDisjunction (SCIP scip, SCIP_CONS cons, SCIP_CONS *addcons)

Macro Definition Documentation

◆ CONSHDLR_NAME

#define CONSHDLR_NAME "disjunction"

Definition at line 32 of file cons_disjunction.c.

Referenced by SCIPaddConsElemDisjunction(), SCIPcreateConsDisjunction(), and SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_DESC

#define CONSHDLR_DESC "disjunction of constraints (or(cons1, cons2, ..., consn))"

Definition at line 33 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_ENFOPRIORITY

#define CONSHDLR_ENFOPRIORITY -950000

priority of the constraint handler for constraint enforcing

Definition at line 34 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_CHECKPRIORITY

#define CONSHDLR_CHECKPRIORITY -900000

priority of the constraint handler for checking feasibility

Definition at line 35 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_PROPFREQ

#define CONSHDLR_PROPFREQ -1

frequency for propagating domains; zero means only preprocessing propagation

Definition at line 36 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_EAGERFREQ

#define CONSHDLR_EAGERFREQ 100

frequency for using all instead of only the useful constraints in separation, propagation and enforcement, -1 for no eager evaluations, 0 for first only

Definition at line 37 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_MAXPREROUNDS

#define CONSHDLR_MAXPREROUNDS -1

maximal number of presolving rounds the constraint handler participates in (-1: no limit)

Definition at line 40 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_DELAYPROP

#define CONSHDLR_DELAYPROP FALSE

should propagation method be delayed, if other propagators found reductions?

Definition at line 43 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_NEEDSCONS

#define CONSHDLR_NEEDSCONS TRUE

should the constraint handler be skipped, if no constraints are available?

Definition at line 44 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_PRESOLTIMING

#define CONSHDLR_PRESOLTIMING SCIP_PRESOLTIMING_FAST

Definition at line 46 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ CONSHDLR_PROP_TIMING

#define CONSHDLR_PROP_TIMING SCIP_PROPTIMING_BEFORELP

Definition at line 47 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

◆ DEFAULT_ALWAYSBRANCH

#define DEFAULT_ALWAYSBRANCH TRUE

alawys perform branching if one of the constraints is violated, otherwise only if all integers are fixed

Definition at line 50 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

Function Documentation

◆ consdataCreate()

static SCIP_RETCODE consdataCreate	(	SCIP *	scip,
		SCIP_CONSDATA **	consdata,
		SCIP_CONS **	conss,
		int	nconss,
		SCIP_CONS *	relaxcons
	)

static

creates disjunction constraint data, captures initial constraints of disjunction

Parameters

scip	SCIP data structure
consdata	pointer to constraint data
conss	initial constraint in disjunction
nconss	number of initial constraints in disjunction
relaxcons	a conjuction constraint containing the liner relaxation of the disjunction constraint, or NULL

Definition at line 79 of file cons_disjunction.c.

References consdataFree(), SCIP_CALL, SCIP_OKAY, SCIPallocBlockMemory, SCIPcaptureCons(), SCIPduplicateBlockMemoryArray, SCIPisTransformed(), SCIPtransformCons(), and SCIPtransformConss().

Referenced by SCIPcreateConsDisjunction().

◆ consdataFree()

static SCIP_RETCODE consdataFree	(	SCIP *	scip,
		SCIP_CONSDATA **	consdata
	)

static

frees constraint data and releases all constraints in disjunction

Parameters

scip	SCIP data structure
consdata	pointer to constraint data

Definition at line 142 of file cons_disjunction.c.

References consdataAddCons(), SCIP_CALL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPfreeBlockMemoryArrayNull, and SCIPreleaseCons().

Referenced by consdataCreate().

◆ consdataAddCons()

static SCIP_RETCODE consdataAddCons	(	SCIP *	scip,
		SCIP_CONSDATA *	consdata,
		SCIP_CONS *	cons
	)

static

adds constraint to disjunction

Parameters

scip	SCIP data structure
consdata	constraint data
cons	constraint to add to the disjunction

Definition at line 174 of file cons_disjunction.c.

References branchCons(), SCIP_CALL, SCIP_OKAY, SCIPcaptureCons(), SCIPensureBlockMemoryArray, SCIPisTransformed(), and SCIPtransformCons().

Referenced by consdataFree(), and SCIPaddConsElemDisjunction().

◆ branchCons()

static SCIP_RETCODE branchCons	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_RESULT *	result
	)

static

branches on disjunctive constraint

Parameters

scip	SCIP data structure
cons	active disjunction constraint
result	pointer to store the result

Definition at line 208 of file cons_disjunction.c.

References checkCons(), SCIP_BRANCHED, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddConsNode(), SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsModifiable(), SCIPcreateChild(), SCIPdebugMsg, SCIPdelConsNode(), SCIPgetLocalTransEstimate(), SCIPresetConsAge(), SCIPsetConsChecked(), and TRUE.

Referenced by consdataAddCons(), enforceConssSOS1(), enforceConstraint(), enforceIndicators(), and enforceSOS2().

◆ checkCons()

static SCIP_RETCODE checkCons	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_SOL *	sol,
		SCIP_Bool	checkintegrality,
		SCIP_Bool	checklprows,
		SCIP_Bool	printreason,
		SCIP_RESULT *	result
	)

static

checks disjunction constraints if at least one is feasible

Parameters

scip	SCIP data structure
cons	active disjunction constraint
sol	solution to check
checkintegrality	Has integrality to be checked?
checklprows	Do constraints represented by rows in the current LP have to be checked?
printreason	Should the reason for the violation be printed?
result	pointer to store the result

Definition at line 269 of file cons_disjunction.c.

References FALSE, propagateCons(), SCIP_CALL, SCIP_FEASIBLE, SCIP_INFEASIBLE, SCIP_OKAY, SCIPactivateSolViolationUpdates(), SCIPcheckCons(), SCIPconsGetData(), SCIPconsGetName(), SCIPdeactivateSolViolationUpdates(), SCIPdebug, SCIPinfoMessage(), SCIPprintCons(), and SCIPupdateSolConsViolation().

Referenced by branchCons(), enforceConstraint(), and SCIP_DECL_CONSCHECK().

◆ propagateCons()

static SCIP_RETCODE propagateCons	(	SCIP *	scip,
		SCIP_CONS *	cons,
		int *	ndelconss
	)

static

propagation method for disjunction constraint

Parameters

scip	SCIP data structure
cons	disjunctive constraint
ndelconss	pointer to count number of deleted constraints

Definition at line 325 of file cons_disjunction.c.

References enforceConstraint(), SCIP_CALL, SCIP_OKAY, SCIP_STAGE_PRESOLVING, SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsChecked(), SCIPconsIsDeleted(), SCIPdelCons(), SCIPdelConsLocal(), SCIPgetNNodes(), SCIPgetStage(), SCIPsetConsChecked(), and TRUE.

Referenced by checkCons(), and SCIP_DECL_CONSPROP().

◆ enforceConstraint()

static SCIP_RETCODE enforceConstraint	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONS **	conss,
		int	nconss,
		SCIP_RESULT *	result
	)

static

helper function to enforce constraints

Parameters

scip	SCIP data structure
conshdlr	constraint handler
conss	constraints to process
nconss	number of constraints
result	pointer to store the result of the enforcing call

Definition at line 388 of file cons_disjunction.c.

References branch(), branchCons(), checkCons(), FALSE, SCIP_Bool, SCIP_BRANCHED, SCIP_CALL, SCIP_DECL_CONSHDLRCOPY(), SCIP_FEASIBLE, SCIP_INFEASIBLE, SCIP_OKAY, SCIPconshdlrGetData(), and SCIPgetNPseudoBranchCands().

Referenced by propagateCons().

◆ SCIP_DECL_CONSHDLRCOPY()

static SCIP_DECL_CONSHDLRCOPY ( conshdlrCopyDisjunction )

static

copy method for constraint handler plugins (called when SCIP copies plugins)

Definition at line 427 of file cons_disjunction.c.

Referenced by enforceConstraint().

◆ SCIP_DECL_CONSFREE()

static SCIP_DECL_CONSFREE ( consFreeDisjunction )

static

destructor of constraint handler to free constraint handler data (called when SCIP is exiting)

Definition at line 443 of file cons_disjunction.c.

◆ SCIP_DECL_CONSDELETE()

static SCIP_DECL_CONSDELETE ( consDeleteDisjunction )

static

frees specific constraint data

Definition at line 464 of file cons_disjunction.c.

◆ SCIP_DECL_CONSTRANS()

static SCIP_DECL_CONSTRANS ( consTransDisjunction )

static

transforms constraint data into data belonging to the transformed problem

Definition at line 474 of file cons_disjunction.c.

◆ SCIP_DECL_CONSINITLP()

static SCIP_DECL_CONSINITLP ( consInitlpDisjunction )

static

LP initialization method of constraint handler

Definition at line 497 of file cons_disjunction.c.

References SCIP_CALL, SCIP_DECL_CONSENFOLP(), SCIP_OKAY, SCIPaddConsLocal(), SCIPconsGetData(), and SCIPconsIsActive().

◆ SCIP_DECL_CONSENFOLP()

static SCIP_DECL_CONSENFOLP ( consEnfolpDisjunction )

static

constraint enforcing method of constraint handler for LP solutions

Definition at line 522 of file cons_disjunction.c.

Referenced by SCIP_DECL_CONSINITLP().

◆ SCIP_DECL_CONSENFORELAX()

static SCIP_DECL_CONSENFORELAX ( consEnforelaxDisjunction )

static

constraint enforcing method of constraint handler for relaxation solutions

Definition at line 532 of file cons_disjunction.c.

◆ SCIP_DECL_CONSENFOPS()

static SCIP_DECL_CONSENFOPS ( consEnfopsDisjunction )

static

constraint enforcing method of constraint handler for pseudo solutions

Definition at line 542 of file cons_disjunction.c.

◆ SCIP_DECL_CONSCHECK()

static SCIP_DECL_CONSCHECK ( consCheckDisjunction )

static

feasibility check method of constraint handler for integral solutions

Definition at line 552 of file cons_disjunction.c.

References checkCons(), SCIP_CALL, SCIP_DECL_CONSPROP(), SCIP_FEASIBLE, SCIP_INFEASIBLE, and SCIP_OKAY.

◆ SCIP_DECL_CONSPROP()

static SCIP_DECL_CONSPROP ( consPropDisjunction )

static

domain propagation method of constraint handler

Definition at line 576 of file cons_disjunction.c.

References propagateCons(), SCIP_CALL, SCIP_DECL_CONSPRESOL(), SCIP_DIDNOTFIND, SCIP_OKAY, and SCIP_REDUCEDDOM.

Referenced by SCIP_DECL_CONSCHECK().

◆ SCIP_DECL_CONSPRESOL()

static SCIP_DECL_CONSPRESOL ( consPresolDisjunction )

static

presolving method of constraint handler

Definition at line 605 of file cons_disjunction.c.

Referenced by SCIP_DECL_CONSPROP().

◆ SCIP_DECL_CONSLOCK()

static SCIP_DECL_CONSLOCK ( consLockDisjunction )

static

variable rounding lock method of constraint handler

Definition at line 659 of file cons_disjunction.c.

◆ SCIP_DECL_CONSPRINT()

static SCIP_DECL_CONSPRINT ( consPrintDisjunction )

static

constraint display method of constraint handler

Definition at line 679 of file cons_disjunction.c.

◆ SCIP_DECL_CONSPARSE()

static SCIP_DECL_CONSPARSE ( consParseDisjunction )

static

constraint parsing method of constraint handler

Definition at line 714 of file cons_disjunction.c.

◆ SCIP_DECL_CONSCOPY()

static SCIP_DECL_CONSCOPY ( consCopyDisjunction )

static

constraint copying method of constraint handler

Definition at line 922 of file cons_disjunction.c.

SCIP

Detailed Description

Macros

Functions

Macro Definition Documentation

◆ CONSHDLR_NAME

◆ CONSHDLR_DESC

◆ CONSHDLR_ENFOPRIORITY

◆ CONSHDLR_CHECKPRIORITY

◆ CONSHDLR_PROPFREQ

◆ CONSHDLR_EAGERFREQ

◆ CONSHDLR_MAXPREROUNDS

◆ CONSHDLR_DELAYPROP

◆ CONSHDLR_NEEDSCONS

◆ CONSHDLR_PRESOLTIMING

◆ CONSHDLR_PROP_TIMING

◆ DEFAULT_ALWAYSBRANCH

Function Documentation

◆ consdataCreate()

◆ consdataFree()

◆ consdataAddCons()

◆ branchCons()

◆ checkCons()

◆ propagateCons()

◆ enforceConstraint()

◆ SCIP_DECL_CONSHDLRCOPY()

◆ SCIP_DECL_CONSFREE()

◆ SCIP_DECL_CONSDELETE()

◆ SCIP_DECL_CONSTRANS()

◆ SCIP_DECL_CONSINITLP()

◆ SCIP_DECL_CONSENFOLP()

◆ SCIP_DECL_CONSENFORELAX()

◆ SCIP_DECL_CONSENFOPS()

◆ SCIP_DECL_CONSCHECK()

◆ SCIP_DECL_CONSPROP()

◆ SCIP_DECL_CONSPRESOL()

◆ SCIP_DECL_CONSLOCK()

◆ SCIP_DECL_CONSPRINT()

◆ SCIP_DECL_CONSPARSE()

◆ SCIP_DECL_CONSCOPY()