/*

     File: EnumerableClass.h

 Abstract: This class generates a list of random numbers (stored in NSNumber 

 objects) at initialization time.  It allows this list of numbers

 to be enumerated in various ways.

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#import <Foundation/Foundation.h>

@interface EnumerableClass : NSObject <NSFastEnumeration>

- (id)initWithCapacity:(NSUInteger)numItems;

@property (readonly) NSUInteger numItems;

// Classes that support indexed subscripting need to declare this method

// in their interface.  It must be declared with the exact signature 

// shown here.  This is because the compiler translates:

//

//      someObject[0];

//

//  into

//

//      [someObject objectAtIndexedSubscript:0];

//

// See <http://clang.llvm.org/docs/ObjectiveCLiterals.html#subscripting-methods>

// for additional information.

- (id)objectAtIndexedSubscript:(NSUInteger)idx;

// Classes that support keyed subscripting need to declare this method

// in their interface.  It must be declared with the exact signature 

// shown here.  This is because the compiler translates:

//

//      someObject[@"someKey"];

//

//  into

//

//      [someObject objectAtKeyedSubscript:@"someKey"];

//

// See <http://clang.llvm.org/docs/ObjectiveCLiterals.html#subscripting-methods>

// for additional information.

//

// Keyed subscripting is not supported here because this example class only

// deals with numbers.

/* - (id)objectForKeyedSubscript:(NSString*)key; */

// The preferred approach for enumerating over containers, a block-based enumerator

// is not limited to returning only an object for the current iteration.  Extra

// data, such as an index, can also be returned.

- (void)enumerateObjectsUsingBlock:(void (^)(id obj, NSUInteger idx, BOOL *stop))block;

// Classes that support old-style enumeration using NSEnumerator need only declare

// a method that returns an NSEnumerator instance.  There is no protocol to adopt

// like with fast enumeration.  The returned object will actually be our own

// subclass of NSEnumerator, but that is an implementation detail.

- (NSEnumerator*)objectEnumerator;

@end