Re: [Haskell-cafe] what is wrong w my IORef Word32 ?
Joerg Fritsch, Thu 2013-07-18 @ 19:22:46+0200: > Can I easily fix the modifyIORef statement by swapping "something" ? > --Joerg Replace `shiftL` with `flip shiftL` and change the type signature of `sLbitfield` to take an Int instead of an Integer. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Quoting with template haskell
Jose A. Lopes, Wed 2013-07-17 @ 13:36:01+0200: > I am quite new to template haskell and I am still trying to get the > hang of it. How can I achieve something like the following Common Lisp > code ? > > `(,fn ,arg1 ,arg2) > > Or is there a more Haskelley way of doing this ? The naive translation would be: [|$fn $arg1 $arg2|] or, more explicitly: appsE [fn, arg1, arg2] `appsE` is from `Language.Haskell.TH`. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] LLVM Backend status
B B, Thu 2013-06-27 @ 20:55:57+0200: > 2) How can I generate the LLVM IR (or bc) files from the compiler? I > see that durign compilation with -fllvm -v3 flags the bc files are > created but they are immidietly (after usage) deleted - Is it possible > to tell the compiler not to delete them? You can use the `-keep-llvm-files` option for this. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Promoting Haskell via Youtube movies
AlanKim Zimmerman, Mon 2013-06-17 @ 20:38:55+0200: > This looks like quite a good series https://www.youtube.com/user/jekor Seconded. I have really enjoyed his videos so far and it seems like he's regularly producing more. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Getting a Hackage account
You might try just emailing him again (assuming you have not already done that). When I signed up, he replied within a couple of hours. It could be that your original message just slipped under the radar. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Haskell/functional-language people in Raleigh/Durham, North Carolina, USA?
Benjamin Redelings, Tue 2013-04-16 @ 16:25:26-0400: > I'm curious if there are any other people on this list who are > interested in Haskell and functional languages in the Triangle Area, > in North Carolina? I am! Funny you should ask, actually, as I was just wondering the same thing myself earlier today. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Type classes, collections, sum types, closures, and a massive headache
If I understand your message well enough, I think you are looking for GHC's `ExistentialQuantification` extension. Building heterogeneous collections is a common example of what existential types are useful for. Take a look at this wiki page [1]; there is an example of how to accomplish this there, along with a handful of other techniques. [1] http://www.haskell.org/haskellwiki/Heterogenous_collections#Existential_types signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Virthualenv/HsEnv in Windows
Kyle Hanson, Mon 2012-12-24 @ 15:49:44-0600: > Has anyone gotten this to work on Windows either native or on cygwin? > Is there an alternative? It may work on Cygwin, but I know for sure that it wouldn't run natively on Windows, as part of hsenv's functionality involves generating and executing bash scripts. If you've tried it with Cygwin and it didn't work, maybe give some more detail about the problems you're seeing. I am unable to try it out myself as I don't have any Windows machines, but others might be able to offer some insight. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Tutorial: Haskell for the Evil Genius
Joel Burget, Fri 2012-09-14 @ 19:08:29-0700: > I find the Monad instance for Maybe and Either very useful. You can do > things like the following (which technically only uses the Applicative > instance): > > Prelude Control.Applicative> (*3) <$> (+2) <$> Just 1 > Just 9 > Prelude Control.Applicative> (*3) <$> (+2) <$> Nothing > Nothing > Prelude Control.Applicative> (*3) <$> (+2) <$> Left "error" :: Either String > Int > Left "error" > Prelude Control.Applicative> (*3) <$> (+2) <$> Right 1 :: Either String Int > Right 9 Nitpick: You are using the Functor instances of Maybe and Either here, not Applicative. (<$>) == fmap; it just happens to be defined in the Control.Applicative module. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Compiling Haskell targetting different OS/arch
Thiago Negri, Fri 2012-08-24 @ 13:27:32-0300: > Is it possible to compile Haskell code targetting a OS/arch that > differs from the one where the compiler (GHC) is running? No, GHC doesn't currently support cross-compilation. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Please critique my code (a simple lexer)
John Simon, Tue 2012-05-22 @ 10:13:07-0500: > - My `consume` function seems basic enough that it should be library > code, but my searches turned up empty. Did I miss anything? consume = span . flip elem > - Is creating data structures with simple field names like `kind`, > `offset`, etc a good practice? Since the names are global functions, I > worry about namespace pollution, or stomping on functions defined > elsewhere. If you don't intend your module to be imported and used as a library, then there's no reason to worry about this. If you do intend it to be used that way, then it's probably still not worth worrying about, as name clashes can be resolved at the import level via qualified imports or `hiding` lists. If it ends up really being a problem, you can always add a namespace prefix to those names, though honestly I find that kind of ugly. The compiler will always catch cases of ambiguity caused by multiple definitions of the same name being in scope, so you don't have to worry about this causing inadvertent runtime bugs. signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
