sub get_value_iter { our $val; local *val = \$_[0]; if (ref($val) eq 'SCALAR') { my $ref = $val; return sub { my $sub_iter = get_value_iter($$ref); return $sub_iter->($_[0]); }; } if (ref($val) eq 'ARRAY') { my $ref = $val; my $key = 0; my $sub_iter; return sub { for (;;) { return 1 if $sub_iter && $sub_iter->($_[0]); return if $key >= @$ref; $sub_iter = get_value_iter($ref->[$key++]); } }; } if (ref($val) eq 'HASH') { my $ref = $val; my @keys = keys %$ref; my $sub_iter; return sub { for (;;) { return 1 if $sub_iter && $sub_iter->($_[0]); return if not @keys; $sub_iter = get_value_iter($ref->{shift @keys}); } }; } { my $ref = \$val; my $done = 0; return sub { return if $done; $_[0] = $ref; $done = 1; return 1; }; } }