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From Cédric Champeau <>
Subject Re: Lambda expression for Groovy 3
Date Wed, 19 Oct 2016 10:26:14 GMT
2016-10-19 10:51 GMT+02:00 Jochen Theodorou <>:

> On 19.10.2016 09:09, Cédric Champeau wrote:
>> First of all, great work, Daniel ! I'm confident that making the
>> "lambdas" be "closures" in Groovy is enough.
> I think it won't be enough for :: and MethodClosures. Actually, Daniel,
> are those supported in the new Grammar and what are they mapped to?

That's correct. I would really love to have _real_ method mapping for :: in
the static compiler. This is obviously not possible for the dynamic
runtime. One option, if we want to make it possible to optimize from the
static compiler is to have a new AST node, MethodPointer, that would be
interpreted as a MethodClosure, and potentially optimized by the static
compiler later as a method pointer.

> I stated it in the past but
>> I'm going to repeat myself here, I don't think having 2 syntax for
>> "closures/lambdas" with slightly different semantics would help our
>> users/language.
> They should have the semantics of Closure, then it is probably good.
> That said, the static compiler can do better, doing
>> escape analysis, and using "real" lambdas when the target bytecode is 8,
>> as an optimization.
> In Groovy 3 I do plan to make out Closures behave similar to lambdas. Of
> course with the additional problem of Closure not being a functional
> interface... well... let's not get started on MOP2 here ;)
> bye Jochen

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