DistinctDistance constructor Null safety

1. irte_engine
2. distinct_distance
3. DistinctDistance
4. DistinctDistance constructor

DistinctDistance class

1. Constructors
2. DistinctDistance
3. Properties
4. distances
5. hashCode
6. hasListeners
7. initialized
8. isClosed
9. listeners
10. name
11. onDelete
12. onStart
13. runtimeType
14. Methods
15. $configureLifeCycle
16. addListener
17. addListenerId
18. dispose
19. disposeId
20. noSuchMethod
21. notifyChildrens
22. onClose
23. onInit
24. onReady
25. process
26. refresh
27. refreshGroup
28. removeListener
29. removeListenerId
30. toString
31. update
32. Operators
33. operator ==