If you take a look at the $marshall_data variable, it contains this line:

@data2 = @{$data1[2]};

[download]

This makes @data2 into a shallow clone of @{$data1[2]} - i.e. they are now different arrays. :-(

I can get it to work if I serialize to arrayrefs rather than arrays. (PS: it's not that much work to get it to run under strict too!)

use v5.14;
use strict;   # redundant!
use warnings;
use Data::Dumper;

package main {
    our @data1 = qw(one won);
    our @data2 = qw(two too to);
    push @data2, \@data1;
    push @data1, \@data2;
    open my $FH, '>', \(our $marshall_data);
    print {$FH} Data::Dumper->Dump(
        [  \@data1, \@data2 ],
        [qw($data1   $data2)]
    );
    close $FH;
    print "NO " if \@data2 != $data1[2];
    print "CIRCULAR DATA STRUCTURE in package main\n";
}
    
package Other {
    open  my $FH, '<', \$main::marshall_data;
    my $string = do {local $/ = undef; <$FH>};
    close $FH;
    our (@data1, @data2); (*data1, *data2) = do {
        my ($data1, $data2);  # declare
        eval $string;
        ($data1, $data2);
    };
    die "$@\n" if $@;
    print "NO " if \@data2 != $data1[2];
    print "CIRCULAR DATA STRUCTURE in package other\n";
    print \@data2, ' ', $data1[2], "\n\n";
}

[download]
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re: marshalling data by tobyink
in thread marshalling data by BillKSmith

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