I guess this sort of recursion won't work as a role. A role can not depend on one of the classes it is consumed by, it should be independent and only define functionality that can be consumed by various classes. Cleary, this separation is not possible here.
So, why a role at all? Are there really other classes that are very different from Group that can also cluster? If they are similar to the Group class then I think this would better be designed using inheritance, where Group implements the "cluster" method and then you may have sub-classes of Group (or come up with a new parent that Group is a child of too) which modify the behaviour of Group.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||