On Thursday, November 15, 2012 6:01:24 PM UTC-6, Rajul Vora wrote:
>
>
> I want to do something like this:
>
> class foo ( $collection ) {
>
> User <| $collection |>
>
> }
>
> where $collection would be a string like "group == admin or group ==
> powerusers"
>
> Doesn't work. Is there an alternative way to do this?
>
> Syntax error at '|>'; expected '}'
>
It depends on what you mean by "this". As far as I know, there is no way
to implement so dynamic a collection predicate as you want, though you can
do this:
define mymodule::usergroup() {
User<| group == $name |>
}
(Or you could do the something similar with a class, but a defined type is
probably better for modeling this sort of thing.) You can augment that in
various ways, but I think a perceived need to be as generic as you wanted
reflects a modeling problem.
Consider also whether you need to wrap that collection at all. Would it be
a problem to just write
User<| group == 'admin' |>
instead of
mymodule::usergroup { 'admin': }
(or a comparable class declaration)?
I suppose you're actually working on something more complex, of which the
collection is just one part. I'm inclined to think there is a deeper
problem with your design if you perceive a need for such a generic
collection, but unless you explain the real problem you're trying to solve,
there's not much more I can do for you.
John
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