Question

I figured this should be easy, but I am having problems writing a simple class level category method that takes a block for an argument. Here is my example while trying to add a class method to NSAutoreleasePool.

#import <Foundation/Foundation.h>
@interface NSAutoreleasePool (MyBlockAdditions)
+ (void)forWork: (void (^)(void))work;
@end

#import "NSAutoreleasePool+MetaSkillsAdditions.h"
@implementation NSAutoreleasePool (MyBlockAdditions)
+ (void)forWork: (void (^)(void))work {
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  work();
  [pool release];
}
@end

[NSAutoreleasePool forWork:^{
  ...
}];

I am currently getting this error now. I am likely doing something dumb.

2011-03-05 16:17:49.150 MyApp[28100:40b] +[NSAutoreleasePool forWork:]: unrecognized selector sent to class 0xb20598
2011-03-05 16:17:49.154 MyApp[28100:40b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSAutoreleasePool forWork:]: unrecognized selector sent to class 0xb20598'

Answer 1

Have you included the category header file (NSAutoreleasePool+MetaSkillsAdditions.h) to the file containing the code that calls the new method?