TSa (Thomas Sandlaß) thomas-at-sandlass.de |Perl 6| wrote:
.......
my $x = |$obj.foo(1,2); #4
to keep the ReturnCapture, and call it later either explicitly
$x.resume(3);
or implicitly
$x = 3;
Hope that helps, TSa.
Interesting idea, as an alternative to get/set methods like Microsoft
languages. Do you have a pointer to the thread, or collected notes I
could read?
Is there anything in Perl 6 as it stands now that really uses
continuations like this?
I don't like the default lvalue subs as the exist now because I might
want to do more than assign to the value located with the access. Even
if that's fine now, how do I add an "clear_cache; tell_subscribers;"
after the value is changed? It means adding the ugly C++ form and then
changing all existing uses.
But, I realized that the ability to return a tied scalar as a proxy
object gives us this. You can specify an accessor that returns an
object that has the getter/setter installed in the FETCH/STORE
routines. A class can be written for the purpose, that takes blocks
(anonomous methods) in the constructor, and a macro gives reasonable
syntactic sugar for writing separate get/set methods right by the attribute.
I'm not sure about returning things other than a scalar.
But the point is, since it _can_ be done in a module, I'm punting on
that and not lobbying for it for 6.0 when there is so much else that
needs doing.
--John
