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Return link information when adding objects to list

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This commit is contained in:
Richard Frith-Macdonald 2021-02-23 13:53:48 +00:00
parent 2a1ec7970c
commit 509d365349
2 changed files with 34 additions and 24 deletions
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40
GSLinkedList.h
View file

@ -261,7 +261,7 @@ extern GSListLink*
GSLinkedListFindIdentical(NSObject *object, GSLinkedList *list,
GSListLink *from, BOOL back);
/** Returns the first object in the list.
/** Returns the first (head) object in the list.
*/
static inline id
GSLinkedListFirstObject(GSLinkedList *list)
@ -287,7 +287,7 @@ GSLinkedListInsertAfter(GSListLink *link, GSLinkedList *list, GSListLink *at);
extern void
GSLinkedListInsertBefore(GSListLink *link, GSLinkedList *list, GSListLink *at);
/** Returns the last object in the list.
/** Returns the last (tail) object in the list.
*/
static inline id
GSLinkedListLastObject(GSLinkedList *list)
@ -297,12 +297,14 @@ GSLinkedListLastObject(GSLinkedList *list)
return list->tail->item;
}
/** Moves the link to the head of the list if it is not already there.
/** Moves the link to the head of the list (makes it the first object)
* if it is not already there.
*/
extern void
GSLinkedListMoveToHead(GSListLink *link, GSLinkedList *list);
/** Moves the link to the tail of the list if it is not already there.
/** Moves the link to the tail of the list (makes it the last object)
* if it is not already there.
*/
extern void
GSLinkedListMoveToTail(GSListLink *link, GSLinkedList *list);
@ -327,23 +329,27 @@ GSLinkedListRemove(GSListLink *link, GSLinkedList *list);
GSListLink *free; /** The unused links */
}
/** Adds an object at the end of the list (calls -insertObject:after:).
/** Adds an object at the head of the list (calls -insertObject:after:),
* making it the first object in the list.<br />
* Returns the list link that the object is stored in.
*/
- (void) addObject: (id)anObject;
- (GSListLink*) addObject: (id)anObject;
/** Returns the first (head) object in the list or nil if the list is empty.
*/
- (id) firstObject;
/** Inserts anObject immediately after the specified link. If at is nil
* the object is inserted at the end of the list (as tail).
* the object is inserted at the end of the list (as tail).<br />
* Returns the list link that the object is stored in.
*/
- (void) insertObject: (id)anObject after: (GSListLink*)at;
- (GSListLink*) insertObject: (id)anObject after: (GSListLink*)at;
/** Inserts anObject immediately before the specified link. If at is nil
* the object is inserted at the start of the list (as head).
* the object is inserted at the start of the list (as head).<br />
* Returns the list link that the object is stored in.
*/
- (void) insertObject: (id)anObject before: (GSListLink*)at;
- (GSListLink*) insertObject: (id)anObject before: (GSListLink*)at;
/** Returns the last (tail) object in the list or nil if the list is empty.
*/
@ -354,12 +360,12 @@ GSLinkedListRemove(GSListLink *link, GSLinkedList *list);
*/
- (void) purge;
/** Removes the first object from the list (or does nothing if the list
/** Removes the first (head) object from the list (or does nothing if the list
* is empty).
*/
- (void) removeFirstObject;
/** Removes the last object from the list (or does nothing if the list
/** Removes the last (tail) object from the list (or does nothing if the list
* is empty).
*/
- (void) removeLastObject;
@ -375,16 +381,18 @@ GSLinkedListRemove(GSListLink *link, GSLinkedList *list);
@end
/** Adds the object to the list after the specified link.<br />
* Calls GSLinkedListInsertAfter().
* Calls GSLinkedListInsertAfter().<br />
* Returns the list link that the object is stored in.
*/
extern void
extern GSListLink*
GSLinkStoreInsertObjectAfter(
NSObject *anObject, GSLinkStore *list, GSListLink *at);
/** Adds the object to the list before the specified link.<br />
* Calls GSLinkedListInsertBefore().
* Calls GSLinkedListInsertBefore().<br />
* Returns the list link that the object is stored in.
*/
extern void
extern GSListLink*
GSLinkStoreInsertObjectBefore(
NSObject *anObject, GSLinkStore *list, GSListLink *at);

18
GSLinkedList.m
View file

@ -498,9 +498,9 @@ GSLinkedListMoveToTail(GSListLink *link, GSLinkedList *list)
@implementation GSLinkStore
- (void) addObject: (id)anObject
- (GSListLink*) addObject: (id)anObject
{
GSLinkStoreInsertObjectAfter(anObject, self, tail);
return GSLinkStoreInsertObjectAfter(anObject, self, tail);
}
- (void) dealloc
@ -523,14 +523,14 @@ GSLinkedListMoveToTail(GSListLink *link, GSLinkedList *list)
return GSLinkedListFirstObject(self);
}
- (void) insertObject: (id)anObject after: (GSListLink*)at
- (GSListLink*) insertObject: (id)anObject after: (GSListLink*)at
{
GSLinkStoreInsertObjectAfter(anObject, self, at);
return GSLinkStoreInsertObjectAfter(anObject, self, at);
}
- (void) insertObject: (id)anObject before: (GSListLink*)at
- (GSListLink*) insertObject: (id)anObject before: (GSListLink*)at
{
GSLinkStoreInsertObjectBefore(anObject, self, at);
return GSLinkStoreInsertObjectBefore(anObject, self, at);
}
- (id) lastObject
@ -590,7 +590,7 @@ GSLinkedListMoveToTail(GSListLink *link, GSLinkedList *list)
@end
void
GSListLink*
GSLinkStoreInsertObjectAfter(
NSObject *anObject, GSLinkStore *list, GSListLink *at)
{
@ -607,9 +607,10 @@ GSLinkStoreInsertObjectAfter(
}
link->item = [anObject retain];
GSLinkedListInsertAfter(link, list, (nil == at) ? list->tail : at);
return link;
}
void
GSListLink*
GSLinkStoreInsertObjectBefore(
NSObject *anObject, GSLinkStore *list, GSListLink *at)
{
@ -626,6 +627,7 @@ GSLinkStoreInsertObjectBefore(
}
link->item = [anObject retain];
GSLinkedListInsertBefore(link, list, (nil == at) ? list->head : at);
return link;
}
void