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kotlinlang

is there a lib that'll do saturation math, or error / exception on overflow?

or do you just do it in `BigInteger` and check at the end?

I've actually been working on one, <https://github.com/ephemient/kotlin-numeric|https://github.com/ephemient/kotlin-numeric>
saturating and exact math should all work, with tests, but I'm not using it in any real projects yet so no guarantees
(also has a multi-platform BigInteger and I'm planning a multi-platform BigDecimal, but there's some tricky cases I need to work through)

a bit complicated by codegen but the basic idea is simple

for error on overflow on JVM, there's standard Java methods

for Long, instead of using BigInteger you just have a variety of cases to handle based on sign

if you're only targeting JVM then Guava has all the exact/saturating arithmetic methods too

very cool. Yeah, I'm JVM only. And there are just a few times I want an error if I'm overflowing a long.

<https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#addExact-long-long-|https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#addExact-long-long->

<https://guava.dev/releases/snapshot-jre/api/docs/com/google/common/math/LongMath.html#saturatedAdd(long,long)|https://guava.dev/releases/snapshot-jre/api/docs/com/google/common/math/LongMath.html#saturatedAdd(long,long)>

I have code for ULong but you probably don't need that