// Remove first node that contains the given data
void *removeIfExists(List* list, void* data) {
ListNode *element = list->head;
while ((element != NULL) && (element->data != data)) {
element = element->next;
}
if (element != NULL) {
data = unlinkElement(list, element);
}
return data;
}
// remove element at index (0-indexed)
void *removeElement(List *list, int index) {
void *data = NULL;
if (index >= list->num_nodes) {
return data;
}
ListNode *element = NULL;
int i = 0;
element = list->head;
while (i++ < index) {
element = element->next;
}
data = unlinkElement(list, element);
return data;
}
void
deleteElement (Element *element) {
unlinkElement(element);
discardElement(element);
}
void
requeueElement (Element *element) {
unlinkElement(element);
enqueueElement(element);
}