RFR: [type-classes] JDK-8376823: Add prototype polynomial class [v3]

[Joe Darcy]

On Sat, 31 Jan 2026 23:07:00 GMT, Chen Liang <liach at openjdk.org> wrote:

> Just curious, are we planning to experience with a more generic polynomial that takes an eligible numerical type, like ones that take float or textbook imaginary?

Yes, long-term that is a possibility -- that was part of the motivation for naming the class "PolynomialDouble" rather than just "Polynomial." Conceptually, Polynomial<N extends Numeric> would make sense, perhaps with some mild side-conditions on Numerics.

> src/java.base/share/classes/java/math/PolynomialDouble.java line 174:
> 
>> 172:             return (i == 0) ?
>> 173:                 ZERO :
>> 174:                 new PolynomialDouble(Arrays.copyOf(coeffs, i));
> 
> Let's defensively copy coeffs before checking for zero - the check and the copy might read different values for `coeffs[i - 1]` if the coeffs is updated by another thread.

Yeah, meant to do that, TOCTOU and all that. Thanks.

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PR Comment: https://git.openjdk.org/valhalla/pull/2004#issuecomment-3829560235
PR Review Comment: https://git.openjdk.org/valhalla/pull/2004#discussion_r2750162898