HaloO,
Larry Wall wrote:
role Num is also does Complex {
method im {...}
}
Is that the actual syntax? I mean is it the keyword pair
'is also' or does 'also' by itself have a meaning? With
a more natural 'role Num also does Complex'.
but roles are really supposed to be fairly immutable in the Perl 6
scheme of things, so such a declaration would probably have to require
that the Num role never have been composed into anything else yet.
Doesn't a role also do the package role? That is we might just
keep the uncomposed roles and their does-hierarchy around for
later method lookup.
Or we could say that you can't reopen the Num role; you can only
reopen the Num class and mix in the Complex role. That's where it
stands at the moment.
BTW, how is it achieved to have a class Num and a role Num?
Can one just write
role Blahh {...}
class Blahh does Blahh {...}
or is there some hidden magic for built-in types? Array, Hash etc.
seem to pull the same stunt---but how?
Regards, TSa.
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