Blocks for NSEnumerator

SSEnumeratorWithBlocks.m

// Copyright (c) 2012 Colin Barrett, Springs & Struts <colin@springsandstruts.com>
// Released under the MIT license. http://www.opensource.org/licenses/mit-license.html

#import <Foundation/Foundation.h>

@interface NSEnumerator (SSEnumeratorWithBlocks)
- (void)ss_enumerateObjectsUsingBlock:(void (^)(id obj, BOOL *stop))enumBlock;
@end

@implementation NSEnumerator (SSEnumeratorWithBlocks)

- (void)ss_enumerateObjectsUsingBlock:(void (^)(id obj, BOOL *stop))enumBlock
{
    BOOL stop = NO;
    id obj = nil;

    for (obj in self) {
        enumBlock(obj, &stop);
        if (stop)
            break;
    }
}

@end

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        NSEnumerator *testEnumerator = [[NSArray arrayWithObjects:@"hello", @"world", @"DESTROY", nil] objectEnumerator];
        [testEnumerator ss_enumerateObjectsUsingBlock:^(id obj, BOOL *stop) {
            if ([obj isEqual:@"world"]) {
                *stop = YES;
            }
            NSLog(@"%@", obj);
        }];
    }
    return 0;
}

// output:
// hello
// world