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a guest Oct 12th, 2018 58 Never
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  1. typ := &TYP{InternalState: "filled"}
  2. setNil(typ)
  3.  
  4. fmt.Printf("Expecting that %v to be nil", typ)
  5.    
  6. func setNilIf(v *interface{}) {
  7.     *v = nil
  8. }
  9.    
  10. var i interface{} = "Bob"
  11. fmt.Printf("Before: %vn", i)
  12. setNilIf(&i)
  13. fmt.Printf("After: %vn", i)
  14.    
  15. Before: Bob
  16. After: <nil>
  17.    
  18. func setNilPtr(p unsafe.Pointer) {
  19.     *(**int)(p) = nil
  20. }
  21.    
  22. typ := &TYP{InternalState: "filled"}
  23. fmt.Printf("Before: %vn", typ)
  24. setNilPtr(unsafe.Pointer(&typ))
  25. fmt.Printf("After: %vn", typ)
  26.    
  27. Before: &{filled}
  28. After: <nil>
  29.    
  30. func setNilPtr2(i interface{}) {
  31.     v := reflect.ValueOf(i)
  32.     v.Elem().Set(reflect.Zero(v.Elem().Type()))
  33. }
  34.    
  35. typ2 := &TYP{InternalState: "filled"}
  36. fmt.Printf("Before: %vn", typ2)
  37. setNilPtr2(&typ2)
  38. fmt.Printf("After: %vn", typ2)
  39.    
  40. Before: &{filled}
  41. After: <nil>
  42.    
  43. i = nil
  44. typ = nil
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