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I was presuming the OP would replace the calls to deleteref with just the undef. You're right, of course, that making a copy of the reference in a subroutine and undeffing that is a no-op.

use Test::More tests => 2; sub deleteref { my $h = shift; undef $h; } my $c = {d => 3}; deleteref($c); is( keys %$c, 1, 'undef on copy of hashref in a subroutine should not clear it' ); undef $c; is( keys %$c, 0, 'undef on hash reference, not a copy of it in a subroutine, should + clear it' );

In reply to Re^3: recursive reference delete subroutine by Zed_Lopez
in thread recursive reference delete subroutine by Keystroke

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