Decouple views from collections. Same should be done for parallel collections.

Author: DarkDimius

src/strawman/collections/CollectionStrawMan2.scala

@@ -53,10 +53,13 @@ object CollectionStrawMan1 {
     def indexWhere(p: A => Boolean): Int = iterator.indexWhere(p)
     def isEmpty: Boolean = !iterator.hasNext
     def head: A = iterator.next
-    def view: View[A] = iterator _
     def collectAs[C[X] <: Iterable[X]](fi: FromIterator[C]): C[A] = fi.fromIterator(iterator)
   }
 
+  trait Viewable[A] extends Any {
+    def view: View[A]
+  }
+
   /** Transforms returning same collection type */
   trait MonoTransforms[A, Repr] extends Any {
     protected def iter: Iterator[A]
@@ -89,6 +92,11 @@ object CollectionStrawMan1 {
     def iterator = c.iterator
   }
 
+  implicit class IterableIsViewable[A](val c: Iterable[A]) extends Viewable[A]{
+    def iterator: Iterator[A] = c.iterator
+    def view: View[A] = iterator _
+  }
+
   /** Implementation of MonoTransforms for all generic collections */
   implicit class IterableMonoTransforms[A, C[X] <: Iterable[X]](val c: Iterable[A] with FromIterator[C])
   extends AnyVal with MonoTransforms[A, C[A]] {