June 2003 - Haskell-Cafe

Re: Type classes and code generation
by Keith Wansbrough 17 Jun '03

17 Jun '03

> You need to change the first line to this: > > > data C a = C { pair :: forall b. b -> (b,a) } > > and then it works fine (with -fglasgow-exts). But you've now stepped > outside the bounds of Haskell 98. (oops, replying to myself... sure sign of madness! :) ) I hasten to add that this is *not* the same as existential quantification; note carefully the location of the forall wrt the constructor. --KW 8-) -- Keith Wansbrough <kw217(a)cl.cam.ac.uk> http://www.cl.cam.ac.uk/users/kw217/ University of Cambridge Computer Laboratory.

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Re: Type classes and code generation
by Hal Daume III 17 Jun '03

17 Jun '03

(Moved to the Cafe) > Yes, exactly. Every class is translated to a data type declaration, > and every instance is translated to an element of that data type - a > dictionary. (Note that you can't actually write those declarations in > Haskell 98 in general, because they can have polymorphic fields; but > this is a simple extension to the language). Keith, could you elaborate on this parenthetical? Under what circumstances can you not create the dictionary datatype for a class in Haskell 98 (where the class itself is H98 :P)? - Hal

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17 Jun '03

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by Joseph Makale 16 Jun '03

16 Jun '03

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16 Jun '03

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gtk2hs
by Christian Buschmann 15 Jun '03

15 Jun '03

Hi! I tried to implement a simple counter with gtk2hs. To increase my counter I defined following event: onClicked btn $ do si <- textBufferGetStartIter tb ei <- textBufferGetEndIter tb val <- textBufferGetText tb si ei False textBufferSetText tb $ show $ (+1) $ read val But now I don't want always read the textfield to get my counter-value, I would like to save the state of my increased value and would like to pass it to the next call of the function. How can I do this? thanks Christian This is the complete code: import Gtk quitDialog :: IO Bool quitDialog = ..... main :: IO () main = do initGUI --main window win <- windowNew onDelete win (\_->(quitDialog>>= (return . not ))) onDestroy win mainQuit vb <- vBoxNew True 5 hb <- hBoxNew True 5 btn <- buttonNewFromStock stockExecute btn2 <- buttonNewFromStock stockQuit tv <- textViewNew tb <- textBufferNew Nothing textBufferSetText tb "0" textViewSetEditable tv False textViewSetCursorVisible tv False textViewSetBuffer tv tb boxPackStartDefaults vb tv boxPackStartDefaults vb hb boxPackStartDefaults hb btn boxPackStartDefaults hb btn2 hgf <- onClicked btn $ do si <- textBufferGetStartIter tb ei <- textBufferGetEndIter tb val <- textBufferGetText tb si ei False textBufferSetText tb $ show $ (+1) $ read val disconnect hgf onClicked btn2 $ do quit <- quitDialog if quit then widgetDestroy win else return () containerAdd win vb widgetShowAll win mainGUI

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by ５億９千万円証拠有ビジネス 15 Jun '03

15 Jun '03

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no subject
by Team domeus 15 Jun '03

15 Jun '03

Hello haskell-cafe(a)haskell.org, You successfully unsubscribed from the group intelligentlearning(a)domeus.co.uk. You will not receive any more messages from this group. Best regards, Your Domeus Team

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Welcome to the group Intelligent Learning
by Team domeus 15 Jun '03

15 Jun '03

Hello haskell-cafe(a)haskell.org, You have been added to the group Intelligent Learning (intelligentlearning(a)domeus.co.uk) The group owner sends the following welcome message: ---------------------------- Welcome to Intelligent Learning! Our systems and programs can help you to successfully optimize your professional potential in a changing world. To be able to progress efficiently in any area today, we promote new smart working and learning systems through new techniques, tools and methodologies (TTMs) in key Smart Learning Areas: Knowledge Management, Change Management, Quantitative Learning, Qualitative Learning, Skill Management and Business Intelligence. For more information visit our web www.amjsmartlearning.com info(a)amjsmartlearning.com ---------------------------- If you do not wish to receive mails from this group, please return this eMail by clicking on reply. Alternatively, you can send an eMail to intelligentlearning-unsubscribe(a)domeus.co.uk. To unsubscribe via the web please use the following link: http://uk.domeus.com/public/unsubscribe.jsp?tsp=1055676075383&gid=337463&ui… Either way you will be directly deleted from the distribution list. If you have any questions or concerns, please contact the moderators of this Domeus group at intelligentlearning-moderators(a)domeus.co.uk. If your eMail address has been added to this list without your consent and you do not wish to receive any eMails from Domeus, please forward this message to: set_account_inactive(a)domeus.co.uk. Please note that this will disable your eMail address throughout the Domeus system. If you have any questions or problems concerning domeus please contact admin(a)domeus.co.uk. Best regards, Your Domeus Team

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Haskell.org out of date
by Hampus Ram 14 Jun '03

14 Jun '03

Who takes care of haskell.org? If it is the "community" we're obviously not doing it right, lots of broken links and some that is there but does not work (e.g. the wish-list). Only the "libraries and tools" page contains 16 broken links (according to linkchecker.sf.net) and some of the tools should in my opinion be marked clearly with "antique" so you do not get upset when they require ghc 2 to compile without problem... /Hampus - (I can't decide where it's best to post this...) -- Homepage: http://www.dtek.chalmers.se/~d00ram E-mail: d00ram(a)dtek.chalmers.se "Det är aldrig försent att ge upp"

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