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Fixes SI-5201. Adds flatten to TraversableViewLike.

Note: This commit exposes a pretty rich type on flatten in views.  HOWEVER, because we don't
capture the higher kinded type of the underlying collection, it makes returning a more minimal type
pretty dang hard.  I can imagine a very breaking and painful change of capturing the underling
collection as a higher-kinded type as well as the current view type in a *ViewLike.scala.

I hope this kind of issue, along with others, drives a rethink of our view API design.
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jsuereth committed May 9, 2012
1 parent da04d69 commit a516098d4ed774c5ff4f53ef22ed8eb90dc1b8d5
@@ -162,6 +162,8 @@ trait TraversableViewLike[+A,
// if (b.isInstanceOf[NoBuilder[_]]) newFlatMapped(f).asInstanceOf[That]
// else super.flatMap[B, That](f)(bf)
override def flatten[B](implicit asTraversable: A => /*<:<!!!*/ GenTraversableOnce[B]) =
private[this] implicit def asThis(xs: Transformed[A]): This = xs.asInstanceOf[This]

/** Boilerplate method, to override in each subclass
@@ -0,0 +1 @@
@@ -0,0 +1,5 @@
object Test extends App {
val seq = Seq(Seq(1, 2), Seq(3, 4)).view.flatten


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