[Haskell-cafe] Integer representation

[Andrew Martin]

I've never realized how it worked before your explanation of automatic
flags, but this is what the bytestring library does to depend on
integer-gmp/integer-simple.

On Thu, Apr 19, 2018 at 3:01 PM, Claude Heiland-Allen <claude at mathr.co.uk>
wrote:

> Hi David,
>
> On 19/04/18 18:13, David Feuer wrote:
> > Is there any way to determine whether Integer comes from integer-gmp
> > or integer-simple? I'm playing with the idea of using the underlying
> > representation to get more compact/efficient tries, but I need to be
> > able to find out what that representation is.
> One way could be to use an automatic cabal flag.  With it enabled,
> depend on integer-gmp and add hs-source-dirs to a directory containing
> your integer-gmp implementation, with it disabled, depend on
> integer-simple and add hs-source dirs to a directory containing your
> integer-simple implementation.  This gives module-level control.  With
> automatic flag I think cabal will try both and choose the setting that
> gives the best build plan (likely corresponding to the Integer
> implementation of your ghc).
>
>
> Claude
> --
> https://mathr.co.uk
> _______________________________________________
> Haskell-Cafe mailing list
> To (un)subscribe, modify options or view archives go to:
> http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe
> Only members subscribed via the mailman list are allowed to post.
>



-- 
-Andrew Thaddeus Martin
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/haskell-cafe/attachments/20180419/82f16e98/attachment.html>