force_autorelease.mm

/**
* Usage: Call BigAutorelease* a = create_autorelease_object();. If the dealloc message is not printed, this code is not running in an autorelease pool block.
*/
@interface BigAutorelease: NSObject
@property(strong, nonatomic) NSMutableArray *arr;
@end

@implementation BigAutorelease
- (instancetype)init {
  NSLog(@"Make BigAutorelease");
  self = [super init];
  _arr = [NSMutableArray arrayWithObjects:@1, @2, @3, nil];
  for (int i = 0; i < 100000; i++) {
    [_arr addObject:@4];
  }
  return self;
}

- (void)dealloc {
  NSLog(@"Dealloc sampleClass");
}

@end

BigAutorelease *create_autorelease_object() {
  __autoreleasing BigAutorelease *ret = [[BigAutorelease alloc] init];
  return ret;
}