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262 :: Macros and flow control

• stringer (orginal) [2013-10-04T11:43:55+02:00] view original

  I'm dabbling with Nimrod macros, but get this error: Error: invalid control flow: break.

  Here's my code:

  
  macro forever (n: stmt): stmt =
    result = newNimNode (nnkWhileStmt)
    result.add (parseExpr ("true"))
    result.add (n)
    #result.treeRepr.echo
  
  var i = 0
  forever:
    if i > 10:
      break
    echo (i)
    inc i
  Run

  How do you handle flow control when you have break or continue statement in a macro? Is it possible and how, or is it a restriction of the macro system. Thanks!

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• Araq (orginal) [2013-10-04T12:55:49+02:00] view original

  Try an {.immediate.} macro.

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• stringer (orginal) [2013-10-04T20:48:12+02:00] view original

  It works. Thanks for the tip!

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