SPUG: Reference to a hash

[Martin, Asa]

I have a data structure, Hash of Hashes. Most of the entries are single
values. Some are however other hashes. I use $key as a numeric number
incremented for each hash with each key having different headings. For
example..

$HoH{$key}{$heading1} = $value1; 
$HoH{$key}{$heading2} = $value2;
....

For the times when $value is not a scalar, I populate a hash of values. I
then tried to associate that hash as a value like so:

$HoH{$key}{$heading} = \%hash;

For some reason this did not work. When I went to access it as
%{HoH{$key}{$heading}} it did not contain the original data but was empty.
So I had to do this to populate it.

for (keys %hash) {
    $HoH{$key}{$heading}{$_} = $hash{$_};
}

Any ideas as to what's going on here? I'm sure I'm missing something obvious
(certainly wouldn't be the first time). 

Thanks,

Asa C Martin

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