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

[Thomas Hartmann <thomas.hartmann@xxxxxxx>]

Hi Todd,

ah, you are right: `=!=` should catch my cases as well - I totally 
forgot about it ð

Cheers,
  Thomas

On 12/05/2021 17.18, Todd L Miller wrote:
> > 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?
>
>  ÂÂÂÂIf I understood your question correctly, you could also rewrite 
> your expression with =!=, it would seem:
>
> ( Expr1 || regexp(MyAttr, "strfoo") ) =!= true
>
> # an undefined left-hand side is false
> $ classad_eval '' '(False || regexp(MyAttr, "strfoo")) =!= True'
> [Â ]
> true
> # confirm that a non-matching string results in true
> $ classad_eval 'MyAttr = "strbar"' '(False || regexp(MyAttr, "strfoo")) 
> =!= True'
> [ MyAttr = "strbar" ]
> true
> # confirm that a matching string results in false
> $ classad_eval 'MyAttr = "strfoo"' '(False || regexp(MyAttr, "strfoo")) 
> =!= True'
> [ MyAttr = "strfoo" ]
> false
>
> -- ToddM
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