This and other RFCs are available on the web at
http://dev.perl.org/rfc/
=head1 TITLE
Undef values ne value
=head1 VERSION
Maintainer: Richard Proctor <[EMAIL PROTECTED]>
Date: 4 Sep 2000
Mailing List: [EMAIL PROTECTED]
Version: 1
Number: 192
Status: Developing
=head1 ABSTRACT
If you compare a variable that is undefined with something, perl winges.
An undefined value is not equal to a string, it should do the right thing.
=head1 DESCRIPTION
Perl winges if you compare an undefined value. This is silly and one often
has to test for the undefined case (and the empty case for == and !=), then
the equality that the programs logic calls for. If you leave warnings off
perl does the right thing anyway.
Thus:
$foo = undef;
if ($foo == 1) # should fail the test but not complain
if ($foo != 1) # should pass the test, and not complain
if ($foo eq "bar") # should fail the test but not complain
if ($foo ne "bar") # should pass the test, and not complain
lt,<,le,<=,gt,>,ge,>= should behave as now, as it is resonable to object
in these cases as the inequality is not well founded.
A comparison between two undefs should (probably) remain an error.
=head1 IMPLENTATION
No idea
=head1 REFERENCES
None yet
