NSEnumerator.h

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/*  NSEnumerator.h
    Copyright (c) 1995-2015, Apple Inc. All rights reserved.
*/

#import <Foundation/NSObject.h>

@class NSArray<ObjectType>;

NS_ASSUME_NONNULL_BEGIN

/*
* The fast enumeration protocol NSFastEnumeration is adopted and
* implemented by objects wishing to make use of a fast and safe
* enumeration style.  The language "foreach" construct then can
* be used with such objects.
*
* The abstract class NSEnumerator itself is taught how to do this
* for convenience by using -nextObject to return items one at a time.
*/

typedef struct {
    unsigned long state;
    id __unsafe_unretained __nullable * __nullable itemsPtr;
    unsigned long * __nullable mutationsPtr;
    unsigned long extra[5];
} NSFastEnumerationState;

@protocol NSFastEnumeration

- (NSUInteger)countByEnumeratingWithStateNSFastEnumerationState *)state objectsid __unsafe_unretained [])buffer countNSUInteger)len;

@end

@interface NSEnumerator<ObjectType> : NSObject <NSFastEnumeration>

- (nullable ObjectType)nextObject;

@end

@interface NSEnumerator<ObjectType> (NSExtendedEnumerator)

@property (readonly, copy) NSArray<ObjectType> *allObjects;

@end