Created
June 26, 2017 18:10
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trait ViewTransformer[-A,+B] { | |
def sequence(in: Iterable[A]) = transform(in.view).to(IterableFactory.toSpecific(in.iterableFactory)) | |
def transform(v: View[A]): View[B] | |
def map[C](f: B => C): ViewTransformer[A,C] = new ViewTransformerImpl[A,C,B](this) { | |
override def transform(v: View[A]): View[C] = prev.transform(v).map(f) | |
} | |
def flatMap[C](f: B => IterableOnce[C]): ViewTransformer[A,C] = new ViewTransformerImpl[A,C,B](this) { | |
override def transform(v: View[A]): View[C] = prev.transform(v).flatMap(f) | |
} | |
} | |
object ViewTransformer { | |
def id[A] = new ViewTransformer[A,A] { | |
def transform(v: View[A]) = v | |
} | |
} | |
abstract class ViewTransformerImpl[-A,+B,+Interm](val prev: ViewTransformer[A,Interm]) extends ViewTransformer[A,B] |
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