Actually that code doesn't compile, but if you want to know about subroutine references and the use thereof see Re (tilly) 1: References quick reference. Here's some example code for anonymous sub usage e.g

my $anonsub = sub { print "anonymous sub(@_)\n" };

$anonsub->("deref operator");
&$anonsub("sigil deref");

__output__

anonymous sub(deref operator)
anonymous sub(sigil deref)
[download]

See. perlsub for more info.
HTH

_________
broquaint