[HTCondor-users] class ad logic with undef (non-)equal

[Thomas Hartmann <thomas.hartmann@xxxxxxx>]

Hi all,

a short `undef` logic question:

I wrote a statement like
  ( Expr1 || regexp('strfoo',MyAdd) ) != true

Unfortunately, I had assumed, that the regexp macro should always 
resolve to
  ( Expr1 || true/false ) != true
but Kruno pointed out, that in case the ad is undef the macro is not 
defined as well - which would result in
  undef != true
ð


So, one question would be, if there is a `?`-like operator for a boolean 
non-equal comparison, that resolves in false when compared to undef?


To catch undef cases, we are going now for
  ( Expr1 || regexp('strfoo',MyAdd) ? : "" ) ) != true
but we are not sure, if `?` as operator actually catches undefs here?


Cheers,
  Thomas

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