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1693 :: return value from `[]` mutable?

• sstirlin (orginal) [2015-10-03T19:51:19+02:00] view original

  For sequences, the return value of [] seems to be mutable. So, for example, the += operator works as expected, and well as the string .add proc:

  var blah = newSeq[int](10)
  for i in 0..<10:
    blah[i]=10
    blah[i]+=1
  echo blah # shows 11's
  
  var blah1 = newSeq[string](10)
  for i in 0..<10:
    blah1[i]="haha"
    blah1[i].add("addingmore")
  echo blah1  # shows "hahaaddingmore"
  Run

  How can I mimic this behavior for a custom type? I have already defined the [] and []= operators, but I want to do things like [].add and []+=. Is this possible?

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• bluenote (orginal) [2015-10-03T20:20:52+02:00] view original

  This has been asked before on SO (but with a not so clear title):

  http://stackoverflow.com/questions/29461573/nim-operator-overloading

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