| Subject: | trouble using Hash::Merge |
| Date: | Thu, 28 Jul 2011 17:45:20 -0700 |
| To: | "bug-Hash-Merge [...] rt.cpan.org" <bug-Hash-Merge [...] rt.cpan.org> |
| From: | John Busco <JBusco [...] nvidia.com> |
I'm trying to write a script to combine two sets of hash data structures and produce a master hash with all the combinations. I wonder if there is something I'm doing wrong here, or if the Hash::Merge package isn't working as expected. I don't want anyone spending much time debugging my code, but if you recognize what may be wrong, or have revealing questions for me, I'd appreciate it.
I attach a copy of the script. It loads my local copy of Hash::Merge<http://search.cpan.org/~dmuey/Hash-Merge-0.12/Merge.pm> for now.
I have two Hash data structures that I want to merge (include the data structures from both in a new hash) and add as a new entry in a "master" hash table.
my $hash1A = {
'unit' => 'U1'
};
my $hash2 = {
'customize_node' => {
'step1' => {
'tool' => 'dc'
}
}
};
After merge, produces
$VAR1 = {
'unit' => 'U1',
'customize_node' => {
'step1' => {
'tool' => 'dc'
}
}
};
That looks good. Then, I insert this in to a "master hash" keyed by the unit name (U1):
$VAR1 = {
'U1' => {
'unit' => 'U1',
'customize_node' => {
'step1' => {
'tool' => 'dc'
}
}
}
};
That all looks fine. But when I create another merged hash from
my $hash1B = {
'unit' => 'U2'
};
And previous $hash2, though it looks fine by itself
$VAR1 = {
'unit' => 'U2',
'customize_node' => {
'step1' => {
'tool' => 'dc'
}
}
};
It gets "corrupted" when I insert it into the master hash:
$VAR1 = {
'U1' => {
'unit' => 'U1',
'customize_node' => {
'step1' => {
'tool' => 'dc'
}
}
},
'U2' => {
'unit' => 'U2',
'customize_node' => {
'step1' => $VAR1->{'U1'}{'customize_node'}{'step1'}
}
}
};
I don't understand this $VAR1 business being dumped out. It's like there's a circular reference. Is it some remnant of part of hash2? I thought Hash::Merge would create a new copy of the hash data structure.
Thanks for any ideas,
John
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