if     ( local $_ = $obj->get_id() )  # XXX Use "my $id =" instead of
{                                     #     "local $_ =" for clarity.
    $obj->do_this();
}
elsif     ( $_ = $obj->create_id() )  # XXX Use "$id =" instead of
{                                     #     "$_ =" for clarity.
    $obj->do_that();
}
else
{
    $obj->do_somethingelse();
}