On Wed, May 17, 2006 at 07:54:21AM +0800, Audrey Tang wrote:
> Chip Salzenberg wrote:
> > On Tue, May 16, 2006 at 03:24:20PM -0500, Patrick R. Michaud wrote:
> >>>> sub foo($x is rw) {
> >>>> $x = new SomeClass
> >>>> }
> >>>>
> >>>> @z = 0..2;
> >>>> foo( @z[1] );
>
> The assignment does do what Patrick suggests.
As a Perl 6 user: "Good." :-)
> If you change the assignment to a binding, it acts on the lexical pad of
> &foo, changing the object $x points to, and does _not_ touch @z.
Understood. [Remainder of helpful & detialed description of := vs. =
elided.]
> now suppose we assign into $x; that invokes the Scalar object's
> assignment method:
Interesting.
So it seems that "is rw" will work fine w/o Parrot changes.
<speculation>
All that's needed is for the Perl 6 implementors to create a perl6;Scalar
container that's more or less a translucent reference: It will handle
assignment by switching to a new value, but it will handle most other
operations by delegating to the value it currently holds.
</speculation>
Audrey, is this basically your plan for (scalar) containers? If not, what is?
--
Chip Salzenberg <[EMAIL PROTECTED]>
