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PObject * PAbstractSortedList::GetAt ( PINDEX  index ) const [virtual]

Get the object at the specified ordinal position. If the index was greater than the size of the collection then NULL is returned.

pointer to object at the specified index.

Implements PCollection.

Definition at line 987 of file collect.cxx.

References PContainer::GetSize().

  if (index >= GetSize())
    return NULL;

  if (index != info->lastIndex) {
    if (index == info->lastIndex-1) {
      info->lastElement = info->Predecessor(info->lastElement);
    else if (index == info->lastIndex+1 && info->lastElement != NULL) {
      info->lastElement = info->Successor(info->lastElement);
    else {
      info->lastIndex = index;
      info->lastElement = info->OrderSelect(info->root, index+1);

  return PAssertNULL(info->lastElement)->data;

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