scala.collection.convert.impl.RangeStepper.scala Maven / Gradle / Ivy
/*
* 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.collection.convert
package impl
import scala.collection.{IntStepper, Stepper}
/** Implements Stepper on an integer Range. You don't actually need the Range to do this,
* so only the relevant parts are included. Because the arguments are protected, they are
* not error-checked; `Range` is required to provide valid arguments.
*/
private[collection] final class RangeStepper(protected var myNext: Int, myStep: Int, _i0: Int, _iN: Int)
extends IndexedStepperBase[IntStepper, RangeStepper](_i0, _iN)
with IntStepper {
def nextStep(): Int =
if (hasStep) {
val ans = myNext
myNext += myStep
i0 += 1
ans
}
else Stepper.throwNSEE()
protected def semiclone(half: Int): RangeStepper = new RangeStepper(myNext, myStep, i0, half)
override def trySplit(): IntStepper = {
val old_i0 = i0
val ans = super.trySplit()
myNext += (i0 - old_i0) * myStep
ans
}
}