An Objective-C pattern for making sum types - Example.m - ExampleBar

ExampleBar.m

#import "ExampleBar.h" // https://gist.github.com/hborders/f1c231a89de11157adf46ee85880733a
#import "ExamplePrivate.h" // https://gist.github.com/hborders/12fcbe34cf4de68c2317bad92a8e223d

@implementation ExampleBar
- (instancetype _Nonnull)initPrivate {
  NSLog(@"Unavailable");
  abort();
}
- (instancetype _Nonnull)initWithB:(NSInteger)b
                                 c:(NSInteger)c {
  self = [super initPrivate];
  if (self) {
    _b = b;
    _c = c;
  }
  return self;
}
- (void)switchFoo:(void (^ _Nonnull)(ExampleFoo * _Nonnull foo_))fooBlock
              bar:(void (^ _Nonnull)(ExampleBar * _Nonnull bar_))barBlock {
  NSParameterAssert(fooBlock);
  NSParameterAssert(barBlock);
  [super switchFoo:fooBlock
               bar:barBlock];
  barBlock(self);
}
@end