Root-relative namespace keys

[perlpilot]

On Jan 7, 12:57 am, Allison Randal <alli... at parrot.org> wrote:
> The fundamental problem in this message is better HLL handling in the
> :multi modifier.
>
>  >>     .sub 'xyz' :multi(['MyHash'])
>
> The solution for :multi may be quite different than the solution for the
> opcodes: it's a completely different context, compile-time rather than
> runtime, completely different use (annotating a signature rather than
> performing a lookup), etc. But some fundamental similarities in how we
> refer to classes can and should be preserved.
>
> We already have a consistent system for annotating sub parameters, so I
> have a hard time justifying inventing a new one. Because of this, the
> most compelling idea to me was to make :multi a no-argument modifier to
> .sub, and put the MMD decoration on the .params. We could make that
> consistent with class lookups by using the same key names:
>
>    .sub 'blah' :multi
>      .param pmc 'thingy' :hll('lang') :namespace('my') :name('foo')
>

How would  this affect the use of underscore to mean "any"?  For
instance, would the following make sense?

.sub 'blah' :multi
    .param pmc 'alpha' :hll('L') :namespace('N') :name(_)      # any
class from the hll L and the namespace N?
    .param pmc 'beta' :hll('L') :namespace(_) :name('C')        # a
class C from any namespace in the hll L?
    .param pmc 'gamma' :hll(_) :namespace('N') :name('C')  # a class
C  from namespace N in any hll?
    .param pmc 'delta' :hll('L') :namespace(_) :name(_)         # any
class in any namespace from hll L?

extrapolate the others, because hopefully you get the idea by now :-)

Would the above do something useful?

-Scott
--
Jonathan Scott Duff <duff at pobox.com>