refering back to this thread, I'm strugglying with the way how to export datas from my module. One way is working but not the other one which I would like to implement.
The question is why the second method in the script is not working ? (I did not h2xs the module as I guess this is for distributing only)
Perl 5.10/ Linux distro
Module my_common_declarations.pm
#!/usr/bin/perl -w
package my_common_declarations;
use strict;
use warnings;
use parent qw(Exporter);
our @EXPORT_OK = qw(debugme);
# local datas
my ( $tmp, $exec_mode, $DEBUGME );
my %debug_hash = ( true => 1, TRUE => 1, false => 0, FALSE => 0, tmp=>$tmp, exec=>$exec_mode, debugme=>$DEBUGME );
# exported hash
sub debugme {
return %debug_hash;
}
1;
Script
#!/usr/bin/perl -w
use strict;
use warnings;
use my_common_declarations qw(debugme);
# 1st Method: WORKS
my %local_hash = &debugme;
print "\n1st method:\nTRUE: ". $local_hash{true}. " ou : " . $local_hash{TRUE} , "\n";
# 2nd Method: CAVEATS
# error returned : "Global symbol "%debug_hash" requires explicit package name"
print "2nd method \n " . $debug_hash{true};
__END__
Thx in advance.
You’re returning not a hash but rather a copy of the hash. All hashes passed into or out of a function get dehashed into a key-value pairlist. Hence, a copy.
Return a reference to the hash instead:
But this reveals your internals to the world outside. Not a very clean thing to do.
You could also add
%debug_hash
to your@EXPORT
list, but that’s an even dodgier thing to do. Please please please use a functional interface only, and you won’t regret it — and more importantly, neither shall anyone else. :)