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Re^5: Perl cheat sheet (dualvars)

by ikegami (Pope)
on Jan 07, 2009 at 09:23 UTC ( #734591=note: print w/ replies, xml ) Need Help??

in reply to Re^4: Perl cheat sheet (dualvars)
in thread Perl cheat sheet

The example was fine. It doesn't make sense for logger to need the dualvar.

  • If you wanted to pass the error string to the sub, the caller would use "$!".
  • If you wanted to pass the error number to sub, the caller would use 0+$!.
  • If the sub needs both an error string and an error number, it would take two arguments.
  • If the sub wants to look at $!, it wouldn't take it as an argument.

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