Two things: i) are you building an OO module for phylogenetics? (If yes, let's join forces); ii) here's how I did it:
sub parent {
my $self = $_[0];
if ( $_[1] ) {
my $parent = $_[1];
if ( $parent->can('parent') ) {
$self->[PARENT] = $parent;
}
else {
my $ref = ref $self;
carp "parents can only be $ref objects";
return;
}
}
return $self->[PARENT];
}
This follows the "if it walks like a duck" paradigm. Not saying that this is the best way to do it, but it works for me.
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