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/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala
package object collection {
@deprecated("Use Iterable instead of Traversable", "2.13.0")
type Traversable[+X] = Iterable[X]
@deprecated("Use Iterable instead of Traversable", "2.13.0")
val Traversable = Iterable
@deprecated("Use IterableOnce instead of TraversableOnce", "2.13.0")
type TraversableOnce[+X] = IterableOnce[X]
@deprecated("Use IterableOnce instead of TraversableOnce", "2.13.0")
val TraversableOnce = IterableOnce
@deprecated("Use SeqOps instead of SeqLike", "2.13.0")
type SeqLike[A, T] = SeqOps[A, Seq, T]
@deprecated("Use SeqOps (for the methods) or IndexedSeqOps (for fast indexed access) instead of ArrayLike", "2.13.0")
type ArrayLike[A] = SeqOps[A, Seq, Seq[A]]
@deprecated("Gen* collection types have been removed", "2.13.0")
type GenTraversableOnce[+X] = IterableOnce[X]
@deprecated("Gen* collection types have been removed", "2.13.0")
val GenTraversableOnce = IterableOnce
@deprecated("Gen* collection types have been removed", "2.13.0")
type GenTraversable[+X] = Iterable[X]
@deprecated("Gen* collection types have been removed", "2.13.0")
val GenTraversable = Iterable
@deprecated("Gen* collection types have been removed", "2.13.0")
type GenIterable[+X] = Iterable[X]
@deprecated("Gen* collection types have been removed", "2.13.0")
val GenIterable = Iterable
@deprecated("Gen* collection types have been removed", "2.13.0")
type GenSeq[+X] = Seq[X]
@deprecated("Gen* collection types have been removed", "2.13.0")
val GenSeq = Seq
@deprecated("Gen* collection types have been removed", "2.13.0")
type GenSet[X] = Set[X]
@deprecated("Gen* collection types have been removed", "2.13.0")
val GenSet = Set
@deprecated("Gen* collection types have been removed", "2.13.0")
type GenMap[K, +V] = Map[K, V]
@deprecated("Gen* collection types have been removed", "2.13.0")
val GenMap = Map
/** Needed to circumvent a difficulty between dotty and scalac concerning
* the right top type for a type parameter of kind * -> *.
* In Scalac, we can provide `Any`, as `Any` is kind-polymorphic. In dotty this is not allowed.
* In dotty, we can provide `[X] => Any`. But Scalac does not know lambda syntax.
*/
private[scala] type AnyConstr[X] = Any
/** An extractor used to head/tail deconstruct sequences. */
object +: {
/** Splits a sequence into head +: tail.
* @return Some((head, tail)) if sequence is non-empty. None otherwise.
*/
def unapply[A, CC[_] <: Seq[_], C <: SeqOps[A, CC, C]](t: C with SeqOps[A, CC, C]): Option[(A, C)] =
if(t.isEmpty) None
else Some(t.head -> t.tail)
}
/** An extractor used to init/last deconstruct sequences. */
object :+ {
/** Splits a sequence into init :+ last.
* @return Some((init, last)) if sequence is non-empty. None otherwise.
*/
def unapply[A, CC[_] <: Seq[_], C <: SeqOps[A, CC, C]](t: C with SeqOps[A, CC, C]): Option[(C, A)] =
if(t.isEmpty) None
else Some(t.init -> t.last)
}
}
