[Haskell-cafe] Way to implement toFloat :: (Num a) => a -> Float

[Ben Foppa]

> toRational :: Real a => a -> Rational

This, combined with

fromRational :: Fractional a => Rational -> a

forms realToFrac :: (Real a, Fractional b) => a -> b


On Thu, Dec 12, 2013 at 2:29 PM, Niklas Haas <haskell at nand.wakku.to> wrote:

> On Thu, 12 Dec 2013 20:19:35 +0100, EatsKittens <
> temporalabstraction at gmail.com> wrote:
> > Is there a way to add a method to a typeclass like num to implement this
> > concept? A function that converts any number to floats?
> Non-text part: text/html
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>
> The typeclass Real has this in a slightly different form:
>
> toRational :: Real a => a -> Rational
>
> You can use fromRational :: Rational -> Float together with this to
> implement your function.
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