On Tue, Oct 10, 2006 at 01:31:59PM -0700, Ovid wrote: > Hi all, > > In doing a bit of work with traits (roles) in Perl 5 > (http://perlmonks.org/?node_id=577477), I've realized some edge cases > which could be problematic. > > First, when a role is applied to a class at runtime, a instance of that > class in another scope may specifically *not* want that role.
I always thought when a role is applied to a class at runtime you get a new (anonymous) subclass. The original class isn't affected. Tim. > Is there > a way of restricting a role to a particular lexical scope short of > merely applying that role to instances instead of classes? > > Second, how can I remove roles from classes? I've create some code > which adds an "is_selected" method to some classes but when I'm done, > I'd like top easily remove that role. How do I do that? Seems closely > related to my first question, but it's still a distinct issue, I think. > > Third, http://dev.perl.org/perl6/doc/design/syn/S12.html says: > > You can also mixin a precomposed set of roles: > > $fido does Sentry | Tricks | TailChasing | Scratch; > > Should that be the following? > > $fido does Sentry & Tricks & TailChasing & Scratch; > > Cheers, > Ovid > > -- > > Buy the book -- http://www.oreilly.com/catalog/perlhks/ > Perl and CGI -- http://users.easystreet.com/ovid/cgi_course/
