Detailed Description

internal methods for presolvers

Author: Tobias Achterberg

Definition in file presol.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_presol.h"
#include "scip/pub_presol.h"

Go to the source code of this file.

Functions
SCIP_RETCODE	SCIPpresolCopyInclude (SCIP_PRESOL presol, SCIP_SET set)

SCIP_RETCODE	SCIPpresolCreate (SCIP_PRESOL *presol, SCIP_SET set, SCIP_MESSAGEHDLR messagehdlr, BMS_BLKMEM blkmem, const char name, const char desc, int priority, int maxrounds, SCIP_Bool delay, SCIP_DECL_PRESOLCOPY((presolcopy)), SCIP_DECL_PRESOLFREE((presolfree)), SCIP_DECL_PRESOLINIT((presolinit)), SCIP_DECL_PRESOLEXIT((presolexit)), SCIP_DECL_PRESOLINITPRE((presolinitpre)), SCIP_DECL_PRESOLEXITPRE((presolexitpre)), SCIP_DECL_PRESOLEXEC((presolexec)), SCIP_PRESOLDATA presoldata)

SCIP_RETCODE	SCIPpresolFree (SCIP_PRESOL *presol, SCIP_SET set)

SCIP_RETCODE	SCIPpresolInit (SCIP_PRESOL presol, SCIP_SET set)

SCIP_RETCODE	SCIPpresolExit (SCIP_PRESOL presol, SCIP_SET set)

SCIP_RETCODE	SCIPpresolInitpre (SCIP_PRESOL presol, SCIP_SET set)

SCIP_RETCODE	SCIPpresolExitpre (SCIP_PRESOL presol, SCIP_SET set)

SCIP_RETCODE	SCIPpresolExec (SCIP_PRESOL presol, SCIP_SET set, SCIP_Bool execdelayed, int nrounds, int nfixedvars, int naggrvars, int nchgvartypes, int nchgbds, int naddholes, int ndelconss, int naddconss, int nupgdconss, int nchgcoefs, int nchgsides, SCIP_RESULT *result)

void	SCIPpresolSetPriority (SCIP_PRESOL presol, SCIP_SET set, int priority)

void	SCIPpresolSetCopy (SCIP_PRESOL presol, SCIP_DECL_PRESOLCOPY((presolcopy)))

void	SCIPpresolSetFree (SCIP_PRESOL presol, SCIP_DECL_PRESOLFREE((presolfree)))

void	SCIPpresolSetInit (SCIP_PRESOL presol, SCIP_DECL_PRESOLINIT((presolinit)))

void	SCIPpresolSetExit (SCIP_PRESOL presol, SCIP_DECL_PRESOLEXIT((presolexit)))

void	SCIPpresolSetInitpre (SCIP_PRESOL presol, SCIP_DECL_PRESOLINITPRE((presolinitpre)))

void	SCIPpresolSetExitpre (SCIP_PRESOL presol, SCIP_DECL_PRESOLEXITPRE((presolexitpre)))

Function Documentation

SCIP_RETCODE SCIPpresolCopyInclude	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

copies the given presolver to a new scip

Parameters

presol	presolver
set	SCIP_SET of SCIP to copy to

Definition at line 72 of file presol.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIPpresolGetName().

Referenced by SCIPsetCopyPlugins().

SCIP_RETCODE SCIPpresolCreate	(	SCIP_PRESOL **	presol,
		SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		BMS_BLKMEM *	blkmem,
		const char *	name,
		const char *	desc,
		int	priority,
		int	maxrounds,
		SCIP_Bool	delay,
		SCIP_DECL_PRESOLCOPY((*presolcopy))	,
		SCIP_DECL_PRESOLFREE((*presolfree))	,
		SCIP_DECL_PRESOLINIT((*presolinit))	,
		SCIP_DECL_PRESOLEXIT((*presolexit))	,
		SCIP_DECL_PRESOLINITPRE((*presolinitpre))	,
		SCIP_DECL_PRESOLEXITPRE((*presolexitpre))	,
		SCIP_DECL_PRESOLEXEC((*presolexec))	,
		SCIP_PRESOLDATA *	presoldata
	)

creates a presolver

Parameters

presol	pointer to store presolver
set	global SCIP settings
messagehdlr	message handler
blkmem	block memory for parameter settings
name	name of presolver
desc	description of presolver
priority	priority of the presolver (>= 0: before, < 0: after constraint handlers)
maxrounds	maximal number of presolving rounds the presolver participates in (-1: no limit)
delay	should presolver be delayed, if other presolvers found reductions?
presoldata	presolver data

Definition at line 90 of file presol.c.

References BMSallocMemory, BMSduplicateMemoryArray, FALSE, NULL, paramname, SCIP_ALLOC, SCIP_CALL, SCIP_CLOCKTYPE_DEFAULT, SCIP_MAXSTRLEN, SCIP_OKAY, SCIPclockCreate(), SCIPsetAddBoolParam(), SCIPsetAddIntParam(), SCIPsnprintf(), and TRUE.

Referenced by SCIPincludePresol(), and SCIPincludePresolBasic().

SCIP_RETCODE SCIPpresolFree	(	SCIP_PRESOL **	presol,
		SCIP_SET *	set
	)

frees memory of presolver

Parameters

presol	pointer to presolver data structure
set	global SCIP settings

Definition at line 154 of file presol.c.

References BMSfreeMemory, BMSfreeMemoryArray, NULL, SCIP_CALL, SCIP_OKAY, and SCIPclockFree().

Referenced by SCIPsetFree().

SCIP_RETCODE SCIPpresolInit	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

initializes presolver

Parameters

presol	presolver
set	global SCIP settings

Definition at line 180 of file presol.c.

Referenced by SCIPsetInitPlugins().

SCIP_RETCODE SCIPpresolExit	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

deinitializes presolver

Parameters

presol	presolver
set	global SCIP settings

Definition at line 240 of file presol.c.

References FALSE, SCIP_Presol::initialized, SCIP_Presol::name, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, and SCIP_Presol::setuptime.

Referenced by SCIPsetExitPlugins().

SCIP_RETCODE SCIPpresolInitpre	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

informs presolver that the presolving process is being started

Parameters

presol	presolver
set	global SCIP settings

Definition at line 271 of file presol.c.

References FALSE, SCIP_Presol::lastnaddconss, SCIP_Presol::lastnaddholes, SCIP_Presol::lastnaggrvars, SCIP_Presol::lastnchgbds, SCIP_Presol::lastnchgcoefs, SCIP_Presol::lastnchgsides, SCIP_Presol::lastnchgvartypes, SCIP_Presol::lastndelconss, SCIP_Presol::lastnfixedvars, SCIP_Presol::lastnupgdconss, NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIP_Presol::setuptime, and SCIP_Presol::wasdelayed.

Referenced by SCIPsetInitprePlugins().

SCIP_RETCODE SCIPpresolExitpre	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

informs presolver that the presolving process is finished

Parameters

presol	presolver
set	global SCIP settings

Definition at line 307 of file presol.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Presol::setuptime.

Referenced by SCIPsetExitprePlugins().

SCIP_RETCODE SCIPpresolExec	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set,
		SCIP_Bool	execdelayed,
		int	nrounds,
		int *	nfixedvars,
		int *	naggrvars,
		int *	nchgvartypes,
		int *	nchgbds,
		int *	naddholes,
		int *	ndelconss,
		int *	naddconss,
		int *	nupgdconss,
		int *	nchgcoefs,
		int *	nchgsides,
		SCIP_RESULT *	result
	)

executes presolver

Parameters

presol	presolver
set	global SCIP settings
execdelayed	execute presolver even if it is marked to be delayed
nrounds	number of presolving rounds already done
nfixedvars	pointer to total number of variables fixed of all presolvers
naggrvars	pointer to total number of variables aggregated of all presolvers
nchgvartypes	pointer to total number of variable type changes of all presolvers
nchgbds	pointer to total number of variable bounds tightened of all presolvers
naddholes	pointer to total number of domain holes added of all presolvers
ndelconss	pointer to total number of deleted constraints of all presolvers
naddconss	pointer to total number of added constraints of all presolvers
nupgdconss	pointer to total number of upgraded constraints of all presolvers
nchgcoefs	pointer to total number of changed coefficients of all presolvers
nchgsides	pointer to total number of changed left/right hand sides of all presolvers
result	pointer to store the result of the callback method