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7235 :: collect for seq[set[int8]]

• HJarausch (orginal) [2020-12-10T14:19:17+01:00] view original

  I don't understand collect. Given

  
  type BS8 = set[int8]
  var S = collect(newSeq) :
    for i in 0..2 :  {} # how can specify which type of set, e.g. BS8, here?
  Run

  Unfortunately this doesn't work

  
  var S = collect(newSeq[BS8]) :
    ...
  Run

  Thanks for a hint, Helmut

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• HJarausch (orginal) [2020-12-10T14:42:33+01:00] view original

  Thanks!

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• elcritch (orginal) [2020-12-10T22:34:09+01:00] view original

  Wow I didn't know you could assign types like that. Handy! But oh, that could be abused by unscrupulous people, including myself.

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• doofenstein (orginal) [2020-12-10T23:30:36+01:00] view original

  this works as well:

  import sugar
  
  let s = collect(newSeq):
    for i in 0..2: set[int8]({})
  Run

  or

  import sugar
  
  let s = collect(newSeq):
    for i in 0..2:
      var x: set[int8]
      # do some kind of operation on x
      x
  Run

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• snej (orginal) [2020-12-11T19:48:50+01:00] view original

  Wow I didn't know you could assign types like that.

  That's not an assignment, it's just a regular type declaration. In this case it's just creating a shorthand for a longer type name, like a C typedef.

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