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1747 :: A suggestion for enums and procs

• Arrrrrrrrr (orginal) [2015-10-28T20:38:30+01:00] view original

  I like enums and the more i use them, the less i miss classic inheritance. But i dont want to end up with giantic case statements.

  In my mind, nim would be able to turn:

  type MyEnum = enum meA, meB, meC
  proc doStuff(me: MyEnum.meA, i: int) = discard #Or me: meA
  proc doStuff(me: MyEnum.meB, i: int) = discard #Or me: meB
  Run

  into this:

  proc doStuff_meA(me: MyEnum, i: int) = discard
  proc doStuff_meB(me: MyEnum, i: int) = discard
  
  proc doStuff(me: MyEnum, i: int) =
    case me:
    of meA: doStuff_meA(me, i)
    of meB: doStuff_meB(me, i)
    else: discard
  Run

  Araq says: but it is only a macro away! Yeah, but it would require me to declare every proc inside the same macro block, which is my main complaint when using enums

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• repax (orginal) [2015-10-28T22:02:32+01:00] view original

  Why not go all the way:

  
  proc doStuff(me: MyEnum, i: int) if me == meA = discard
  
  proc doStuff(me: MyEnum, i: int) if me == meA or i < 5 = discard
  Run

  This has its problems of course, because more than one declaration can apply ;)

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