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5605 :: Help with templates and injected symbols

• drkameleon (orginal) [2019-11-27T20:40:54+01:00] view original

  I have the following template:

  template inPlace*(hs:int, code: untyped) =
      block:
          var i = len(Stack) - 1
          var j: int
          while i > -1:
              j = 0
              while j<Stack[i].len:
                  if Stack[i][j][0]==hs:
                      code
                      return
                  inc(j)
              
              dec(i)
  Run

  which is supposed to be called like this:

  inPlace:
      Stack[i][j][1] = ....
  Run

  Is there any way Stack[i][j] is visible in the code segment passed to the template?

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• rayman22201 (orginal) [2019-11-28T00:43:11+01:00] view original

  I can think of two ways off the top of my head:

  Simple but ugly, just inject i and j:

  https://play.nim-lang.org/#ix=230K

  slightly more complicated but more beautiful (requires macros):

  https://play.nim-lang.org/#ix=230N

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