Do you want to get a magical variable that keeps together a value, its hash key and the hash where they originated from?

package HashTriplet;
use strict;

sub new {
    my( $class, %options ) = @_;
    bless \%options => $class
}

sub hash { $_[0]->{hash} }
sub key  { $_[0]->{key} }

sub value {
    my( $self ) = @_;
    $self->hash->{ $self->key }
}

1;

package main;
use strict;

my $myHash = { key => "value" } ;
foreach( keys %{ $myHash } ) {
   doSomething( HashTriplet->new( hash => $myHash, key => $_ ));
}

sub doSomething {
warn $_[0];
warn $_[0]->key;
    print "key = " . $_[0]->key . "\n";
    print( (  $_[0]->value ) . "\n" ) ;
    print( (  $_[0]->hash )->{ $_[0]->key } . "\n" ) ;
}
__END__

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If you want the additional syntax trickery to make Perl treat key $x; as $x->key you will need to fiddle around a bit with prototypes, but as I'm a bit unclear on the purpose of your data structure, I'll just stop here.

In reply to Re: key value pair reference? by Corion
in thread key value pair reference? by Veltro

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