#!/usr/bin/perl -l

package Example::Module;

use overload '""' => sub { ref shift };

sub new {
    bless [ $_[1] || "default" ], shift;
}

sub Example::Module {
    return Example::Module::->new(@_);
}

sub print_it {
    print $_[0]->[0];
}

package main;

$a = Example::Module();
$a->print_it;

$b = Example::Module("b");
$b->print_it;
__END__
default
b