lp_solve / lp_SOS.h

#ifndef HEADER_lp_SOS
#define HEADER_lp_SOS

/* Specially Ordered Sets (SOS) prototypes and settings                      */
/* ------------------------------------------------------------------------- */

#include "lp_types.h"
#include "lp_utils.h"
#include "lp_matrix.h"


/* SOS constraint defines                                                    */
/* ------------------------------------------------------------------------- */
#define SOS1                     1
#define SOS2                     2
#define SOS3                    -1
#define SOSn                      MAXINT32
#define SOS_START_SIZE          10  /* Start size of SOS_list array; realloced if needed */

/* Define SOS_is_feasible() return values                                    */
/* ------------------------------------------------------------------------- */
#define SOS3_INCOMPLETE         -2
#define SOS_INCOMPLETE          -1
#define SOS_COMPLETE             0
#define SOS_INFEASIBLE           1
#define SOS_INTERNALERROR        2


typedef struct _SOSgroup SOSgroup;

typedef struct _SOSrec
{
  SOSgroup  *parent;
  int       tagorder;
  char      *name;
  int       type;
  MYBOOL    isGUB;
  int       size;
  int       priority;
  int       *members;
  REAL      *weights;
  int       *membersSorted;
  int       *membersMapped;
} SOSrec;

/* typedef */ struct _SOSgroup
{
  lprec     *lp;                /* Pointer to owner */
  SOSrec    **sos_list;         /* Array of pointers to SOS lists */
  int       sos_alloc;          /* Size allocated to specially ordered sets (SOS1, SOS2...) */
  int       sos_count;          /* Number of specially ordered sets (SOS1, SOS2...) */
  int       maxorder;           /* The highest-order SOS in the group */
  int       sos1_count;         /* Number of the lowest order SOS in the group */
  int       *membership;        /* Array of variable-sorted indeces to SOSes that the variable is member of */
  int       *memberpos;         /* Starting positions of the each column's membership list */
} /* SOSgroup */;


#ifdef __cplusplus
extern "C" {
#endif

/* SOS storage structure */
STATIC SOSgroup *create_SOSgroup(lprec *lp);
STATIC void resize_SOSgroup(SOSgroup *group);
STATIC int append_SOSgroup(SOSgroup *group, SOSrec *SOS);
STATIC int clean_SOSgroup(SOSgroup *group, MYBOOL forceupdatemap);
STATIC void free_SOSgroup(SOSgroup **group);

STATIC SOSrec *create_SOSrec(SOSgroup *group, char *name, int type, int priority, int size, int *variables, REAL *weights);
STATIC MYBOOL delete_SOSrec(SOSgroup *group, int sosindex);
STATIC int append_SOSrec(SOSrec *SOS, int size, int *variables, REAL *weights);
STATIC void free_SOSrec(SOSrec *SOS);

/* SOS utilities */
STATIC int make_SOSchain(lprec *lp, MYBOOL forceresort);
STATIC int SOS_member_updatemap(SOSgroup *group);
STATIC MYBOOL SOS_member_sortlist(SOSgroup *group, int sosindex);
STATIC MYBOOL SOS_shift_col(SOSgroup *group, int sosindex, int column, int delta, LLrec *usedmap, MYBOOL forceresort);
int SOS_member_delete(SOSgroup *group, int sosindex, int member);
int SOS_get_type(SOSgroup *group, int sosindex);
int SOS_infeasible(SOSgroup *group, int sosindex);
int SOS_member_index(SOSgroup *group, int sosindex, int member);
int SOS_member_count(SOSgroup *group, int sosindex);
int SOS_memberships(SOSgroup *group, int column);
int *SOS_get_candidates(SOSgroup *group, int sosindex, int column, MYBOOL excludetarget, REAL *upbound, REAL *lobound);
int SOS_is_member(SOSgroup *group, int sosindex, int column);
MYBOOL SOS_is_member_of_type(SOSgroup *group, int column, int sostype);
MYBOOL SOS_set_GUB(SOSgroup *group, int sosindex, MYBOOL state);
MYBOOL SOS_is_GUB(SOSgroup *group, int sosindex);
MYBOOL SOS_is_marked(SOSgroup *group, int sosindex, int column);
MYBOOL SOS_is_active(SOSgroup *group, int sosindex, int column);
MYBOOL SOS_is_full(SOSgroup *group, int sosindex, int column, MYBOOL activeonly);
MYBOOL SOS_can_activate(SOSgroup *group, int sosindex, int column);
MYBOOL SOS_set_marked(SOSgroup *group, int sosindex, int column, MYBOOL asactive);
MYBOOL SOS_unmark(SOSgroup *group, int sosindex, int column);
int SOS_fix_unmarked(SOSgroup *group, int sosindex, int variable, REAL *bound, REAL value,
                     MYBOOL isupper, int *diffcount, DeltaVrec *changelog);
int SOS_fix_list(SOSgroup *group, int sosindex, int variable, REAL *bound, 
                  int *varlist, MYBOOL isleft, DeltaVrec *changelog);
int SOS_is_satisfied(SOSgroup *group, int sosindex, REAL *solution);
MYBOOL SOS_is_feasible(SOSgroup *group, int sosindex, REAL *solution);

#ifdef __cplusplus
 }
#endif

#endif /* HEADER_lp_SOS */
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