62 lines
1.5 KiB
Objective-C
62 lines
1.5 KiB
Objective-C
#import <Foundation/Foundation.h>
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@class DDListEnumerator;
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struct DDListNode {
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void * element;
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struct DDListNode * prev;
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struct DDListNode * next;
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};
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typedef struct DDListNode DDListNode;
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/**
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* The DDList class is designed as a simple list class.
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* It can store objective-c objects as well as non-objective-c pointers.
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* It does not retain objective-c objects as it treats all elements as simple pointers.
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*
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* Example usages:
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* - Storing a list of delegates, where there is a desire to not retain the individual delegates.
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* - Storing a list of dispatch timers, which are not NSObjects, and cannot be stored in NSCollection classes.
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*
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* This class is NOT thread-safe.
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* It is designed to be used within a thread-safe context (e.g. within a single dispatch_queue).
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**/
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@interface DDList : NSObject <NSFastEnumeration>
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{
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DDListNode *listHead;
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DDListNode *listTail;
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}
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- (void)add:(void *)element;
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- (void)remove:(void *)element;
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- (void)removeAll:(void *)element;
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- (void)removeAllElements;
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- (BOOL)contains:(void *)element;
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- (NSUInteger)count;
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/**
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* The enumerators return a snapshot of the list that can be enumerated.
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* The list can later be altered (elements added/removed) without affecting enumerator snapshots.
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**/
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- (DDListEnumerator *)listEnumerator;
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- (DDListEnumerator *)reverseListEnumerator;
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@end
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@interface DDListEnumerator : NSObject
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{
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NSUInteger numElements;
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NSUInteger currentElementIndex;
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void **elements;
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}
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- (NSUInteger)numTotal;
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- (NSUInteger)numLeft;
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- (void *)nextElement;
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@end
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