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Fix LazyList.range [ci: last-only] #10767

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Fix LazyList.range [ci: last-only] #10767

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6de2bf8
Override LazyList.range
BalmungSan Apr 30, 2024
91088b5
Test LazyList.range
BalmungSan Apr 30, 2024
bd3db0d
Better LazyList.range impl
BalmungSan Apr 30, 2024
f7745a4
Move LazyList.range implementation closer to other overrides
BalmungSan Apr 30, 2024
2028dae
Ensure lazyness of `Integral[A].one` for overrided `range` implementa…
BalmungSan Apr 30, 2024
fbc2623
Ensure step can't be zero
BalmungSan Apr 30, 2024
1ac4f64
Allow reverse LazyList.range
BalmungSan Apr 30, 2024
b4eb90a
Make the lazyRangeAllowsMoreThanIntMaxValue test run fast
BalmungSan Apr 30, 2024
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Better LazyList.range impl 
Co-authored-by: Marissa | April <[email protected]>
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@BalmungSan @NthPortal
BalmungSan and NthPortal authored Apr 30, 2024
commit bd3db0d40a434241d674e5ea0d23ab6f19f5248f
6 changes: 5 additions & 1 deletion src/library/scala/collection/immutable/LazyList.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -973,7 +973,11 @@ object LazyList extends SeqFactory[LazyList] {
range(start, end, step = Integral[A].one)

override def range[A](start: A, end: A, step: A)(implicit ev: Integral[A]): LazyList[A] =
LazyList.iterate(start)(ev.plus(_, step)).takeWhile(ev.lt(_, end))
newLL(rangeImpl(start, end, step))

private[this] def rangeImpl[A](start: A, end: A, step: A)(implicit ev: Integral[A]): State[A] =
if (ev.lt(start, end)) sCons(start, newLL(rangeImpl(ev.plus(start, step), end, step)))
else State.Empty

// Eagerly evaluate cached empty instance
private[this] val _empty = newLL(State.Empty).force
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