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7948 :: How to check a function pointer type with if statement ?

• kcvinu (orginal) [2021-05-07T23:37:04+02:00] view original

  Hi all I have a function pointer type like this.

  type FuncPtr = proc(x : int)
  
  type
      Sample = ref object of RootObj
          fPtr : FuncPtr
          # other  members
  var smp = newSample()
  
  # Now, i need to check fptr contains any valid function pointer or not --
  if smp.fPtr : smp.fPtr(150)
  Run

  How to do this check ?

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• Araq (orginal) [2021-05-07T23:41:13+02:00] view original

  if smp.fPtr != nil: smp.fPtr(150)
  
  Run

  It's a bit like natural language, you cannot say "if one then we're all doomed", but you can say "if true then we're all doomed".

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• kcvinu (orginal) [2021-05-08T00:21:28+02:00] view original

  @Araq, Thanks a lot. I don't know why this idea didn't came to my mind. I am so stupid. I was trying with something like "is" and "repr". :)

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