/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012
* Jonathan Schleifer <js@webkeks.org>
*
* 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"
@class OFEnumerator;
/**
* \brief A protocol for getting an enumerator for the object.
*/
@protocol OFEnumerating
/**
* \brief Returns an OFEnumerator to enumerate through all objects of the
* collection.
*
* \returns An OFEnumerator to enumerate through all objects of the collection
*/
- (OFEnumerator*)objectEnumerator;
@end
/**
* \brief A class which provides methods to enumerate through collections.
*/
@interface OFEnumerator: OFObject
/**
* \brief Returns the next object.
*
* \return The next object
*/
- (id)nextObject;
/**
* \brief Resets the enumerator, so the next call to nextObject returns the
* first object again.
*/
- (void)reset;
@end
/*
* This needs to be exactly like this because it's hardcoded in the compiler.
*
* We need this bad check to see if we already imported Cocoa, which defines
* this as well.
*/
#define of_fast_enumeration_state_t NSFastEnumerationState
#ifndef NSINTEGER_DEFINED
/**
* \brief State information for fast enumerations.
*/
typedef struct of_fast_enumeration_state_t {
/// Arbitrary state information for the enumeration
unsigned long state;
/// Pointer to a C array of objects to return
id *itemsPtr;
/// Arbitrary state information to detect mutations
unsigned long *mutationsPtr;
/// Additional arbitrary state information
unsigned long extra[5];
} of_fast_enumeration_state_t;
#endif
/**
* \brief A protocol for fast enumeration.
*
* The OFFastEnumeration protocol needs to be implemented by all classes
* supporting fast enumeration.
*/
@protocol OFFastEnumeration
/**
* \brief A method which is called by the code produced by the compiler when
* doing a fast enumeration.
*
* \param state Context information for the enumeration
* \param objects A pointer to an array where to put the objects
* \param count The number of objects that can be stored at objects
* \return The number of objects returned in objects or 0 when the enumeration
* finished.
*/
- (int)countByEnumeratingWithState: (of_fast_enumeration_state_t*)state
objects: (id*)objects
count: (int)count;
@end