problem with creating constants from scalar

needperlhelp has asked for the wisdom of the Perl Monks concerning the following question:

How do i create a constant from a scalar


$test = 'value';

use constant CONST_VAL1 => $ENV{'PATH'}; # This works
use constant CONST_VAL2 => scalar localtime # This works
use constant CONST_VAL3 => $test ; # This doesn't work
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upon printing CONST_VAL1 , CONST_VAL2 , the values are printed,
but for CONST_VAL3 i get a empty string.
any clues on how to handle this situation !!!!, thanks

2006-09-05 Retitled by holli, as per Monastery guidelines
Original title: 'constants :-('

Comment on problem with creating constants from scalar Download Code

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Re: problem with creating constants from scalar by Fletch (Bishop) on Aug 30, 2006 at 03:38 UTC
`use` happens at compile time. Your `$test` hasn't been assigned a value yet. Wrap it in a `BEGIN { }` block and it will work.	[reply] [d/l] [select]
Re^2: problem with creating constants from scalar by needperlhelp (Acolyte) on Aug 30, 2006 at 03:53 UTC
Perfect , many thanks for the help	[reply]
Re: problem with creating constants from scalar by duff (Parson) on Aug 30, 2006 at 03:48 UTC
Also, you might want to consider using the Readonly module. duff	[reply]