reflect.m

@interface Range : NSObject <NSFastEnumeration>
@property (readwrite, nonatomic, retain) NSNumber *start;
@property (readwrite, nonatomic, retain) NSNumber *end;

+ (Range *)createWithStart:(NSUInteger)start End:(NSUInteger)end;
- (id)initWithStart:(NSUInteger)start End:(NSUInteger)end;
@end

@implementation Range
@synthesize start = _start;
@synthesize end = _end;

+ (Range *)createWithStart:(NSUInteger)s End:(NSUInteger)e {
  return [[[self alloc] initWithStart:s End:e] autorelease];
}

- (id)initWithStart:(NSUInteger)s End:(NSUInteger)e {
  self = [super init];
  if (!self) {
    return nil;
  }

  self.start = [NSNumber numberWithInteger:s];
  self.end = [NSNumber numberWithInteger:e];
  return self;
}

- (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)state objects:(id *)stackbuf count:(NSUInteger)len {
  NSInteger size = [_end intValue] - [_start intValue];
  if (state->state >= size) {
    return 0;
  }

  NSInteger count = 0;
  while (state->state < size && count < len) {
    stackbuf[count] = [NSNumber numberWithUnsignedLong:state->state];

    state->state++;
    count++;
  }

  state->itemsPtr = stackbuf;
  state->mutationsPtr = (unsigned long*)self;

  return count;
}

@end