Scippy

SCIP

Solving Constraint Integer Programs

Detailed Description

priority queue with O(1) access to the minimum element

Functions

SCIP_RETCODE SCIPpqueueCreate (SCIP_PQUEUE **pqueue, int initsize, SCIP_Real sizefac, SCIP_DECL_SORTPTRCOMP((*ptrcomp)), SCIP_DECL_PQUEUEELEMCHGPOS((*elemchgpos)))
 
void SCIPpqueueFree (SCIP_PQUEUE **pqueue)
 
void SCIPpqueueClear (SCIP_PQUEUE *pqueue)
 
SCIP_RETCODE SCIPpqueueInsert (SCIP_PQUEUE *pqueue, void *elem)
 
void SCIPpqueueDelPos (SCIP_PQUEUE *pqueue, int pos)
 
void * SCIPpqueueRemove (SCIP_PQUEUE *pqueue)
 
void * SCIPpqueueFirst (SCIP_PQUEUE *pqueue)
 
int SCIPpqueueNElems (SCIP_PQUEUE *pqueue)
 
void ** SCIPpqueueElems (SCIP_PQUEUE *pqueue)
 
int SCIPpqueueFind (SCIP_PQUEUE *pqueue, void *elem)
 

Function Documentation

◆ SCIPpqueueCreate()

SCIP_RETCODE SCIPpqueueCreate ( SCIP_PQUEUE **  pqueue,
int  initsize,
SCIP_Real  sizefac,
SCIP_DECL_SORTPTRCOMP((*ptrcomp))  ,
SCIP_DECL_PQUEUEELEMCHGPOS((*elemchgpos))   
)

creates priority queue

Parameters
pqueuepointer to a priority queue
initsizeinitial number of available element slots
sizefacmemory growing factor applied, if more element slots are needed

Definition at line 1295 of file misc.c.

References BMSallocMemory, MAX, NULL, pqueueResize(), SCIP_ALLOC, SCIP_CALL, and SCIP_OKAY.

Referenced by initData(), initProblem(), nodepairqueueCreate(), SCIPbendersActivate(), SCIPconflictCreate(), and subtreeSumGapStoreNode().

◆ SCIPpqueueFree()

void SCIPpqueueFree ( SCIP_PQUEUE **  pqueue)

frees priority queue, but not the data elements themselves

Parameters
pqueuepointer to a priority queue

Definition at line 1322 of file misc.c.

References BMSfreeMemory, BMSfreeMemoryArray, and NULL.

Referenced by freeProblem(), nodepairqueueFree(), SCIPbendersDeactivate(), SCIPconflictFree(), and subtreeSumGapDelSubtrees().

◆ SCIPpqueueClear()

void SCIPpqueueClear ( SCIP_PQUEUE pqueue)

clears the priority queue, but doesn't free the data elements themselves

Parameters
pqueuepriority queue

Definition at line 1333 of file misc.c.

References SCIP_PQueue::len, and NULL.

Referenced by conflictClear().

◆ SCIPpqueueInsert()

SCIP_RETCODE SCIPpqueueInsert ( SCIP_PQUEUE pqueue,
void *  elem 
)

inserts element into priority queue

Parameters
pqueuepriority queue
elemelement to be inserted

Definition at line 1394 of file misc.c.

References SCIP_PQueue::len, NULL, PQ_PARENT, pqueueElemChgPos(), pqueueResize(), SCIP_CALL, SCIP_OKAY, and SCIP_PQueue::slots.

Referenced by conflictQueueBound(), createAndSplitProblem(), nodepairqueueCreate(), propagateVbounds(), SCIPbendersActivate(), solveProblem(), subtreeSumGapStoreNode(), and updateSubproblemStatQueue().

◆ SCIPpqueueDelPos()

void SCIPpqueueDelPos ( SCIP_PQUEUE pqueue,
int  pos 
)

delete element at specified position, maintaining the heap property

Parameters
pqueuepriority queue
posposition of element that should be deleted

Definition at line 1433 of file misc.c.

References SCIP_PQueue::len, NULL, PQ_LEFTCHILD, PQ_PARENT, PQ_RIGHTCHILD, pqueueElemChgPos(), SCIPpqueueNElems(), and SCIP_PQueue::slots.

Referenced by SCIPpqueueRemove(), and subtreeSumGapRemoveNode().

◆ SCIPpqueueRemove()

void* SCIPpqueueRemove ( SCIP_PQUEUE pqueue)

removes and returns best element from the priority queue

Parameters
pqueuepriority queue

Definition at line 1493 of file misc.c.

References SCIP_PQueue::len, NULL, SCIPpqueueDelPos(), and SCIP_PQueue::slots.

Referenced by conflictFirstCand(), conflictRemoveCand(), createSolveSubproblemIndexList(), nodepairqueueRemove(), propagateVbounds(), and solveProblem().

◆ SCIPpqueueFirst()

void* SCIPpqueueFirst ( SCIP_PQUEUE pqueue)

returns the best element of the queue without removing it

Parameters
pqueuepriority queue

Definition at line 1513 of file misc.c.

References SCIP_PQueue::len, NULL, and SCIP_PQueue::slots.

Referenced by conflictFirstCand(), nodepairqueueIsEmpty(), subtreeSumGapComputeFromScratchEfficiently(), and subtreeSumGapRemoveNode().

◆ SCIPpqueueNElems()

◆ SCIPpqueueElems()

void** SCIPpqueueElems ( SCIP_PQUEUE pqueue)

returns the elements of the queue; changing the returned array may destroy the queue's ordering!

Parameters
pqueuepriority queue

Definition at line 1538 of file misc.c.

References SCIP_PQueue::len, NULL, and SCIP_PQueue::slots.

Referenced by conflictAddConflictset(), conflictResolveBound(), subtreeSumGapDelSubtrees(), subtreeSumGapRemoveNode(), and subtreeSumGapStoreNode().

◆ SCIPpqueueFind()

int SCIPpqueueFind ( SCIP_PQUEUE pqueue,
void *  elem 
)

return the position of elem in the priority queue, or -1 if element is not found

Parameters
pqueuepriority queue
elemelement to be inserted

Definition at line 1549 of file misc.c.

References SCIPpqueueNElems(), and SCIP_PQueue::slots.

Referenced by propagateVbounds().