undef *$field;
Gotta be careful with that because it will blow away more than just the $field method. Say bye-bye to the $field array the $field hash and everything else in the $field stash...
my $obj = Bar->new()
$Bar::faz = 100;
print '$Bar::faz = ' . $Bar::faz . "\n";
$obj->destroy_methods();
print '$Bar::faz = ' . $Bar::faz . "\n";
__END__
$Bar::faz = 100
$Bar::faz =
Doh!
As written, it might also mess up the method lookup cache that perl uses to determine which methods are overridden and which aren't.
What you'd really like is a way to localize the subroutine portion of the stash, but Perl doesn't provide a clean way to do that.
Before you go much further down this path, you really should read the highly enlightening discussion at: Undefining subroutines and inheritance
-Blake
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