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som-snytt merged 1 commit into from
Apr 2, 2026
+6 −3
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Improve sizeCompare doc #25696

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9 changes: 6 additions & 3 deletions library/src/scala/collection/Iterable.scala
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Expand Up @@ -264,9 +264,12 @@ transparent trait IterableOps[+A, +CC[_], +C] extends Any with IterableOnce[A] w
* x > 0 if this.size > otherSize
* ```
*
* The method as implemented here does not call `size` directly; its running time
* is `O(size min otherSize)` instead of `O(size)`. The method should be overridden
* if computing `size` is cheap and `knownSize` returns `-1`.
* The default implementation does not call `size`, which may be arbitrarily expensive.
* It will use `knownSize` if nonnegative.
* Otherwise, it will iterate to compute an element count,
* with complexity `O(size min otherSize)`.
* This method should be overridden if computing `size` is cheap and `knownSize` returns `-1`.
* In that case, the custom implementation should just compare `size` and `otherSize` directly.
*
* @see [[sizeIs]]
*/
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