See you at JVMLS

Brian Goetz brian.goetz at oracle.com
Tue Aug 18 21:53:21 UTC 2015


Yes, that has to work, though it doesn't currently.  On the list...

On 8/18/2015 5:49 PM, Palo Marton wrote:
> Yes, that's a nice sidestep ;-)
> My question was meant in a general way, not only about results of
> instanceof/isAssignableFrom. What about methods of Bar? Will you
> recreate them in Foo$any? What about eg call to
> f.barMethod()?
> On ut, 18. aug 2015 at 23:39 Brian Goetz <brian.goetz at oracle.com
> <mailto:brian.goetz at oracle.com>> wrote:
>
>     I'll sidestep your clever question by pointing out that the left operand
>     of an instanceof check is an expression, not a type.
>
>     If you have:
>
>           Foo<any> f = ...
>
>           if (f instanceof Bar) { ... }
>
>     this works just fine, because all instantiations of Foo<T> are
>     represented by classes whose supertype is Bar.  The harder question is
>     the reflective one (Class.isAssignableFrom.)  But reflection is still a
>     work in progress (as is the whole thing, of course.)
>
>     On 8/18/2015 5:30 PM, Palo Marton wrote:
>      > Thanks. I have just watched your talk on Valhalla. Just one curious
>      > question on xxx$any interfaces: How do you handle this?
>      >
>      > class Foo<any T> extends Bar { }
>      >
>      > Foo$any instanceof Bar?
>      > On ut, 18. aug 2015 at 19:02 Brian Goetz <brian.goetz at oracle.com
>     <mailto:brian.goetz at oracle.com>
>      > <mailto:brian.goetz at oracle.com <mailto:brian.goetz at oracle.com>>>
>     wrote:
>      >
>      >     JVMLS talks up at:
>      > https://www.youtube.com/user/java
>      >
>      >
>      >     On 8/8/2015 12:05 PM, Brian Goetz wrote:
>      >      > I'll be doing a talk on the path from Model 1 to Model 2
>     (and a
>      >     glimpse
>      >      > of Model 3) at JVMLS next week.  Hope to see some of you
>     there.
>      >     Videos
>      >      > should go up on the Java YouTube channel fairly quickly
>     after the
>      >      > conference.
>      >      >
>      >      > In the meantime ... I'll just note that we've had 50+
>     messages on the
>      >      > various "Model 2" threads and none of them started with "I
>     tried
>      >     it out
>      >      > and..."
>      >      >
>      >      > So a reminder ... the most valuable input the community
>     can give
>      >     in this
>      >      > process is to provide *actual experience reports*.  That's
>     the main
>      >      > reason we make the significant investment in making the
>     code and
>      >     design
>      >      > sketches available early -- so that people can actually try it
>      >     out, and
>      >      > help us see the holes that we might have missed.
>      >      >
>      >      >
>      >
>      > --
>      > Pavol Marton
>
> --
> Pavol Marton


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