Hi,
Stevan Little wrote:
> So, onto my question, I am wondering what are the valid scopes for
> $?SELF and $?CLASS.
>
> Are these (magical) globals who only have bound values in certain
> contexts? If that is so, what value do they have outside of a valid
> context? undef? or is attempting to accessing the value a runtime
> exception?
hm, I've thought of these as follows:
class Foo {...} # is really
class Foo {
my $?CLASS := Foo;
...;
}
method bar($self:) {...} # is really
method bar($self:) {
my $?SELF := $self;
...;
}
> The obvious one is that they are both valid within a method. I asumme
> that $?SELF is bound to the invocant, and $?CLASS is bound to the
> class the method was defined within. It seems to me that this also
> mean that in a class method, that $?SELF == $?CLASS?
I think so, too.
> Also (IIRC) we discussed $?CLASS being valid inside a class Foo { ...
> } block at the hackathon. Would mean that something like this should
> be possible.
>
> class FooLoggerProxy is Foo {
> has Logger $.logger;
> for ($?CLASS.meta.superclasses()) -> $super {
> for ($super.meta.getmethods()) -> $method {
> $?CLASS.meta.add_method($method.label => method {
> $?SELF.logger.log($method.label ~ " has been
> called"); return $method.do([EMAIL PROTECTED])
> });
> }
> }
> }
I'd opt for yes.
> I am not sure if there are any other valid contexts other than inside
> a method or a class composition block. At least none that I can think
> of.
role, submethod?
--Ingo
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