[Haskell-cafe] Best idiom for avoiding Defaulting warnings with
ghc -Wall -Werror ??
bayer at cpw.math.columbia.edu
Fri Jun 22 18:18:40 EDT 2007
On Jun 22, 2007, at 12:34 PM, Dave Bayer wrote:
> In particular, I always want defaulting errors, because sometimes I
> miss the fact that numbers I can count on my fingers are defaulting
> to Integer.
So no one took the bait to actually offer me a shorter idiom, but I
thought about the above sentence, and had a big Homer Simpson "Doh!"
revelation. In the acual code I was cleaning up, just write out the
exponentiations, for example,
> evalBezier :: R -> Bezier -> [R]
> evalBezier t b = let s = 1-t in case b of
> Line x y -> s*.x .+. t*.y
> Cubic w x y z -> s*s*s*.w .+. 3*s*s*t*.x .+. 3*s*t*t*.y .+.
To my taste, that's much prettier than half a dozen lines of
declarations to get ^ to behave with ghc -Wall -Werror, and after all
I'm just hand-unrolling the code for ^.
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