Provide the desired functionality then :)
{
package Container;
use overload (
'@{}' => sub { return [sort keys %{$_[0]}] },
fallback => 1,
);
sub new {
return bless { map { $_ => 1 } @_[1 .. $#_] }, $_[0];
}
}
my $c = Container->new( qw/ e1 e2 e3 / );
print "member $_\n"
for @$c;
__output__
member e1
member e2
member e3
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