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3763 :: [RESOLVED] how to skip initialization of a variable? (cf void initialization)

• timothee (orginal) [2018-04-16T22:26:02+02:00] view original

  D lets you do: T a = void; to skip initialization of a this is useful for efficiency reasons in some performance critical cases, where a would be initialized in subsequent parts of the code and initializing a would be wasteful (potentially sacrificing safety for efficiency in very localized parts of code).

  suggested syntax for nim:

  var a:T=void
  Run

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• Araq (orginal) [2018-04-16T22:33:55+02:00] view original

  var a {.noInit.}: T

  Run

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• Udiknedormin (orginal) [2018-04-16T23:02:39+02:00] view original

  ...which makes much more sense from type system's point of view: if void is to be a subtype to any type at assignment, but no-type at result, it would make it a covariant-contravariant subtype, no problem. But it's a no-type as an argument, too, so it fails.

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