NSString+ConcurrentEnumeration.m

#import "NSString+ConcurrentEnumeration.h"

@implementation NSString (ConcurrentLineEnumeration)

- (void)enumerateConcurrentlyWithOptions:(NSStringEnumerationOptions)options
                              usingBlock:(void (^)(NSString *substring))block
{
  dispatch_group_t group = dispatch_group_create();
  
  [self enumerateSubstringsInRange:NSMakeRange(0, [self length])
                           options:options
                        usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclRange, BOOL *stop)
  {
    dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^ {
      block(substring);
    });
  }];
  
  dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
}

@end