/*
* Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#import "OFObject.h"
#import "OFCollection.h"
#import "OFEnumerator.h"
#import "OFSerialization.h"
OF_ASSUME_NONNULL_BEGIN
typedef struct OFListItem OFListItem;
/**
* @struct OFListItem OFList.h ObjFW/OFList.h
*
* @brief A list item.
*
* A struct that contains a pointer to the next list item, the previous list
* item and the object.
*/
struct OFListItem {
/** A pointer to the next list object in the list */
OFListItem *_Nullable next;
/** A pointer to the previous list object in the list */
OFListItem *_Nullable previous;
/** The object for the list object */
id __unsafe_unretained object;
};
/**
* @class OFList OFList.h ObjFW/OFList.h
*
* @brief A class which provides easy to use double-linked lists.
*/
@interface OFList OF_GENERIC(ObjectType): OFObject <OFCopying, OFCollection,
OFSerialization>
#if !defined(OF_HAVE_GENERICS) && !defined(DOXYGEN)
# define ObjectType id
#endif
{
OFListItem *_Nullable _firstListItem;
OFListItem *_Nullable _lastListItem;
size_t _count;
unsigned long _mutations;
OF_RESERVE_IVARS(OFList, 4)
}
/**
* @brief The first list object of the list.
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFListItem *firstListItem;
/**
* @brief The first object of the list or `nil`.
*
* @warning The returned object is *not* retained and autoreleased for
* performance reasons!
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) ObjectType firstObject;
/**
* @brief The last list object of the list.
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFListItem *lastListItem;
/**
* @brief The last object of the list or `nil`.
*
* @warning The returned object is *not* retained and autoreleased for
* performance reasons!
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) ObjectType lastObject;
/**
* @brief Creates a new OFList.
*
* @return A new autoreleased OFList
*/
+ (instancetype)list;
/**
* @brief Appends an object to the list.
*
* @param object The object to append
* @return An OFListItem, needed to identify the object inside the list.
* For example, if you want to remove an object from the list, you need
* its OFListItem.
*/
- (OFListItem *)appendObject: (ObjectType)object;
/**
* @brief Prepends an object to the list.
*
* @param object The object to prepend
* @return An OFListItem, needed to identify the object inside the list.
* For example, if you want to remove an object from the list, you need
* its OFListItem.
*/
- (OFListItem *)prependObject: (ObjectType)object;
/**
* @brief Inserts an object before another list object.
*
* @param object The object to insert
* @param listItem The OFListItem of the object before which it should be
* inserted
* @return An OFListItem, needed to identify the object inside the list.
* For example, if you want to remove an object from the list, you need
* its OFListItem.
*/
- (OFListItem *)insertObject: (ObjectType)object
beforeListItem: (OFListItem *)listItem;
/**
* @brief Inserts an object after another list object.
*
* @param object The object to insert
* @param listItem The OFListItem of the object after which it should be
* inserted
* @return An OFListItem, needed to identify the object inside the list.
* For example, if you want to remove an object from the list, you need
* its OFListItem.
*/
- (OFListItem *)insertObject: (ObjectType)object
afterListItem: (OFListItem *)listItem;
/**
* @brief Removes the object with the specified list object from the list.
*
* @param listItem The list object returned by append / prepend
*/
- (void)removeListItem: (OFListItem *)listItem;
/**
* @brief Checks whether the list contains an object equal to the specified
* object.
*
* @param object The object which is checked for being in the list
* @return A boolean whether the list contains the specified object
*/
- (bool)containsObject: (ObjectType)object;
/**
* @brief Checks whether the list contains an object with the specified address.
*
* @param object The object which is checked for being in the list
* @return A boolean whether the list contains an object with the specified
* address
*/
- (bool)containsObjectIdenticalTo: (ObjectType)object;
/**
* @brief Removes all objects from the list.
*/
- (void)removeAllObjects;
#if !defined(OF_HAVE_GENERICS) && !defined(DOXYGEN)
# undef ObjectType
#endif
@end
OF_ASSUME_NONNULL_END