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Update perlref.pod to warn $f{B} = $f{A} is only copying a pointer #22036

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Update perlref.pod to warn $f{B} = $f{A} is only copying a pointer #22036

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10 changes: 10 additions & 0 deletions pod/perlref.pod
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,16 @@ brackets:
'Clyde' => 'Bonnie',
};

But be aware:

$folks{A} = {
'Adam' => 'Eve',
'Clyde' => 'Bonnie',
};
$folks{B} = $folks{A}; # just pointers to the anonymous hash
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It's a reference, not a pointer.

%{ $folks{C} } = %{ $folks{A} }; # deep copy
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This is a shallow copy, not a deep copy.

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I think it's great you folks could put something better into that page than my version.

I even had my first accident today hitting the resolve button.

$folks{A}{Clyde} = 'Wilma'; # also updates B! C is immune
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Anonymous hash and array composers like these can be intermixed freely to
produce as complicated a structure as you want. The multidimensional
syntax described below works for these too. The values above are
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