What is the difference between GCD and NSOperationQueue in iOS?

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Tags

1. #using
2. #enables
3. #friends
4. #nsoperation
5. #classes
6. #thing
7. #based
8. #answers
9. #level
10. #first
11. #nsoperationqueue
12. #implemented
13. #concurrency
14. #simple
15. #internally
16. #objective
17. #similar
18. #introduced
19. #model