text: //
  //  SSConcurrentOperation.h
  //  Astronomy
  //
  //  Created by Shawn Gee on 5/19/20.
  //  Copyright © 2020 Swift Student. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  typedef NS_ENUM(NSInteger, SSConcurrentOperationState) {
      SSConcurrentOperationStateReady,
      SSConcurrentOperationStateExecuting,
      SSConcurrentOperationStateFinished
  };
  
  NS_ASSUME_NONNULL_BEGIN
  
  NS_SWIFT_NAME(ConcurrentOperation)
  @interface SSConcurrentOperation : NSOperation
  
  - (void)finish;
  
  @end
  
  NS_ASSUME_NONNULL_END
  