Variables in pipelines
jgetino at telefonica.net
Wed Aug 15 13:35:51 PDT 2012
I was dreaming with a super pipeline that was more than a mere sequence of
operations, maybe nothing from this world.
De: Brian Goetz [mailto:brian.goetz at oracle.com]
Enviado el: miércoles, 15 de agosto de 2012 21:50
CC: lambda-dev at openjdk.java.net
Asunto: Re: Variables in pipelines
One thing you could do here is use "mapped", which is an operation on a
linear stream that produces a MapStream:
rects.mapped(r1 -> rotate(alpha)) // produces stream of (r1, rotated)
.tap((r1, r2) -> ...);
Now downstream stages have access to both.
(What you're specifically asking for doesn't really make linguistic sense;
r1 is like a method parameter, which isn't available outside that method's
On 8/15/2012 3:33 PM, Jose wrote:
> Let suppose I want to do some operations in a stream of rectangles:
> rotate them and finding the intersection of the rotateded rectangles
> with the original ones:
> Here "tap" refers to the discusion on forEach
> The problem is that being r1 a dummy variable, its reference is lost
> in the next link of the chain.
> It would be possible and desirable to keep the references of the
> variables inside a pipeline?.
> Maybe you can use BiMapper to keep trace of another variable, but the
> code would be much more cumbersome.
> Not to say if you want to reuse two o more variables along the pipeline.
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