PROPOSAL: Restrict the type of (^), (^^), and add genericPower,
igloo at earth.li
Sat Nov 17 11:59:02 EST 2007
On Sat, Nov 17, 2007 at 11:45:52AM -0500, Cale Gibbard wrote:
> On 17/11/2007, Ian Lynagh <igloo at earth.li> wrote:
> > (^) :: (Num a) => a -> Int -> a
> > genericPower :: (Num a, Integral b) => a -> b -> a
> This is a move in the opposite direction from what I'd really like to
> see. The Int type is usually a premature optimisation, and I usually
> prefer to work with Integer as much as possible, but this just means
> more fromIntegral conversions (or the use of the awkwardly named
> general version).
> I would much prefer for length, !!, etc. to have more general types,
> not less general (with compiler specialisation on Int of course).
This proposal is about making (^) and (^^) consistent with everything
else. Making everything use Integer rather than Int is an orthogonal
Someone could also make a Prelude.Integer module, that exports
foo :: ... Integer ...
foo = genericFoo
for various foo which are specialised to Int in Prelude, and reexports
all other functions from Prelude. Getting rid of implicit Prelude
imports would help too.
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