Re: Weekly IRC meeting?
> By all means start a more general Haskell meeting too, but I want to keep > this one for GHC. The VCS debate is about what system GHC should use, not > the community as a whole. The HLP discussion is on topic because it is so > closely related to how we release/package/ship GHC. Ah, I assumed this included Hackage. How presumptuous of me. Thomas ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Advice sought for 6.9 and Arrow/Category
On Tue, 2008-07-22 at 04:57 -0500, Spencer Janssen wrote: > > I'm testing for ghc version. Could I somehow test for the base-library > > version instead? - Conal > > Yes. Here is a snippet from binary.cabal: > > flag applicative-in-base > > library > if flag(applicative-in-base) > build-depends: base >= 2.0 > cpp-options: -DAPPLICATIVE_IN_BASE > else > build-depends: base < 2.0 This is the sort of example where our Cabal syntactic sugar proposal helps a bit: library if package(base >= 2.0) cpp-options: -DAPPLICATIVE_IN_BASE So two lines rather than six and you don't need to understand the relational semantics so clearly to make sense of it. Now if only we'd get round to implementing it. Duncan ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Advice sought for 6.9 and Arrow/Category
On Tue, Jul 15, 2008 at 05:45:55PM +0200, Conal Elliott wrote: > By the way, here's how I'm changing my code to work with the new and old > arrow interface. I'd appreciate any suggested improvements. > > The old code (example): > > import Control.Arrow > > [...] > > instance Arrow (~>) => Arrow (Bijection (~>)) where > Bi ab ba >>> Bi bc cb = Bi (ab >>> bc) (cb >>> ba) > [...] > > The new code: > > #if __GLASGOW_HASKELL__ >= 609 > import Control.Category > import Prelude hiding ((.), id) > #endif > import Control.Arrow > > [...] > > #if __GLASGOW_HASKELL__ >= 609 > instance Category (~>) => Category (Bijection (~>)) where > id = Bi id id > Bi bc cb . Bi ab ba = Bi (bc . ab) (ba . cb) > #endif > > instance Arrow (~>) => Arrow (Bijection (~>)) where > #if __GLASGOW_HASKELL__ < 609 > Bi ab ba >>> Bi bc cb = Bi (ab >>> bc) (cb >>> ba) > #endif > [...] > > I'm testing for ghc version. Could I somehow test for the base-library > version instead? - Conal Yes. Here is a snippet from binary.cabal: flag applicative-in-base library if flag(applicative-in-base) build-depends: base >= 2.0 cpp-options: -DAPPLICATIVE_IN_BASE else build-depends: base < 2.0 Cheers, Spencer Janssen ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Weekly IRC meeting?
Thomas M. DuBuisson wrote: Ian and I talked about possibly trying a different time - 9pm UK time, which would be slightly less friendly to us in the UK (I have my work/life balance to think about you know :-) but more friendly to people in the US. I, for one, am happy with the current time; changing it should always be an option though. For this week's discussion, one topic on the table is whether to switch version control systems, which I'm sure will make for a lively debate :) Perhaps we could have an ever evolving wiki page with the when/where/agenda/logs. I've started a rough one [1]; I put it in the general Haskell wiki because these topics certainly aren't confined to GHC. Thomas [1] http://haskell.org/haskellwiki/Weekly_Meeting Hmm, well I did intend these meetings to be focussed mainly on issues relating to GHC, rather than a general Haskell discussion which could be held on #haskell separately. By all means start a more general Haskell meeting too, but I want to keep this one for GHC. The VCS debate is about what system GHC should use, not the community as a whole. The HLP discussion is on topic because it is so closely related to how we release/package/ship GHC. Cheers, Simon ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
