[swift-evolution] Proposal: A standard library Fraction type

[T.J. Usiyan]

I'm all for a stdlib Rational Type. I've written one as well and would be
glad not to have to include it as a dependency everywhere.
TJ

On Mon, Dec 7, 2015 at 1:31 PM, Harlan Haskins via swift-evolution <
swift-evolution at swift.org> wrote:

> If Swift 3 is going to focus on re-thinking the Numerics in the system, it
> might be worth considering adding a Fraction (or Rational) type to the
> standard library. This, coupled with an arbitrary-precision integer type,
> would be a great way to handle arbitrary-precision decimal arithmetic, and
> can alleviate almost all the pain points of floating-point math.
>
> There exist now some really nice implementations of Fractions, but the
> ones I’ve seen haven’t been implemented fully generically.
> My favorite is this one:
> https://gist.github.com/JadenGeller/5e80ebf32442acc62e8e
>
> I’d love to see some standard library support with rock-solid, fast
> implementations of all the common algorithms (GCD, LCD, LCM, reduction,
> etc) and good conformance to the builtin integer protocols. Maybe even
> FloatLiteralConvertible, too, with some logic for converting rational
> floats.
>
> Thoughts?
>
> - Harlan Haskins
>
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