hi list,
I know this is OT but i don't know what list i should ask this on so i
give it a shot here. If you're very annoyed with this mail me private
with a list should use.
I'm trying to use eval () with a constants module and it works very
funny, can anyone explain this behavior to me:
i have a module with constants (constants.pm):
##############################################################
package constants;
my %month_number = (
'Jan' => '01',
'Feb' => '02',
'Mar' => '03',
'Apr' => '04',
'May' => '05',
'Jun' => '06',
'Jul' => '07',
'Aug' => '08',
'Sep' => '09',
'Oct' => '10',
'Nov' => '11',
'Dec' => '12'
);
sub get_constant
{
my $name = shift;
my $ret = ();
"$month_number{Dec}\n"; # <------ ODD ROW
eval '$ret = \\%month_number';
print "$_ -> $ret->{$_}\n" foreach (keys %{$ret}); # just to trace
print "$ret=$ret->{Dec}\n"; # just to trace
return $ret;
}
1;
#EOF
########################################################################
and a dummyscript constant.pl:
########################################################################
use constants;
my $bla = &constants::get_constant ('%month_number');
#EOF
########################################################################
when i run the script with row (<------- ODD ROW) it workds fine:
bash-2.04$ perl constant.pl
Oct -> 10
Dec -> 12
Mar -> 03
Feb -> 02
Jan -> 01
Nov -> 11
May -> 05
Aug -> 08
Sep -> 09
Jul -> 07
Apr -> 04
Jun -> 06
HASH(0x80f8270)=12
but if i remove that line i get:
bash-2.04$ perl constant.pl
HASH(0x80f8270)=
ie it doesn't seems to find the variable...This seems like vodoo to me.
Can anyone explain or point me to a place with an explanation?
/Jon
