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7049 :: local types - how to

• HJarausch (orginal) [2020-11-07T14:52:38+01:00] view original

  I'd like to define a type local to an object, like Bool in the example below

    Apfelbaum = object
      Baum : array[5,int]
      akt_Reihe : int
      max_level : int
      type
        Bool = enum
          Undef, False, True
      Cache : array[2*4*6*8*10,Bool]
  Run

  But I get an error message

   identifier expected, but got 'keyword type'
  Run

  Is it possible in Nim? Many thanks for a hint, Helmut

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• lqdev (orginal) [2020-11-07T15:10:15+01:00] view original

  That's not possible, sorry. You'd have to do something like this:

  type
    ApfelbaumBool = enum
      Undef, True, False
    Apfelbaum = object
      Baum : array[5,int]
      akt_Reihe : int
      max_level : int
      Cache : array[2*4*6*8*10,Bool]
  Run

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• HJarausch (orginal) [2020-11-07T15:51:54+01:00] view original

  Thanks! This seems to imply that local "classes" aren't possible, as well?

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• lqdev (orginal) [2020-11-07T16:02:35+01:00] view original

  Pretty much, yes. But in reality this isn't as bad of a limitation as it may seem :)

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• cantanima (orginal) [2020-11-07T17:26:37+01:00] view original

  I agree that it's probably not much of a limitation, but out of mere curiosity, why is it not allowed?

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• lotzz (orginal) [2020-11-07T18:59:46+01:00] view original

  If you keep your class to a specific module, wouldn't all the types be considered local unless exported specifically?

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