- Haskell-Cafe - Haskell.org

failure notice
by MAILER-DAEMON＠foshan.net 27 May '03

27 May '03

Hi. This is the qmail-send program at foshan.net. I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out. <hauj(a)foshan.net>: Sorry, no mailbox here by that name. vpopmail (#5.1.1) --- Below this line is a copy of the message. Return-Path: <haskell-cafe(a)haskell.org> Received: (ctmail 25865 invoked from network); 27 May 2003 09:57:10 -0000 Received: from unknown (HELO hauj) (218.13.218.251) by 0 with SMTP; 27 May 2003 09:57:10 -0000 From: "haskell-cafe" <haskell-cafe(a)haskell.org> Subject: =?GB2312?B?VE+jumhhdWpAZm9zaGFuLm5ldLvh1LHK1SE=?= 17:52:54:7 To: hauj(a)foshan.net Content-Type: text/html;charset="GB2312" Sender: haskell-cafe <haskell-cafe(a)haskell.org> Reply-To: wangxiao1999(a)163.com Date: Tue, 27 May 2003 17:52:54 +0800 X-Priority: 4 X-Mailer: Microsoft Outlook Express 5.50.4133.2400 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=gb2312"> <META content="MSHTML 6.00.2462.0" name=GENERATOR></HEAD> <BODY>     ÄúºÃ£¡     CCTV-2£º·ÇµäŽÙœø¡¢ÉýÎÂÐÅÏ¢»¯£¬µç×ÓÉÌÎñÐÎÊÆŽóºÃ£¬ÄúžÐÊÜÏ²ÔÃÁËÂð£¿     ÔÚÖøÃûÉÌÃ³ÍøÕŸÖÐÇáËÉÑ°ÕÒÂò·œÓëÂô·œµÄÁªÏµ·œÊœ£š¹«ËŸ¡¢µç»°¡¢Ž«Õæ¡¢ÁªÏµÈË¡¢ÓÊŒþ¡¢µØÖ·µÈ£©£¬²¢ÓëÎŽÀŽ¿Í»§È¡µÃÁªÏµ£¬ÊÇ×îÓÐÐ§¡¢×î¿ìœÝ¡¢×îµÍ³É±ŸµÄÓªÏú·œ·š¡£     ÉÌÖÇµç×ÓÉÌÎñÈíŒþŸÍÄÜ°ïÄúÊµÏÖÍêÃÀ£¡Íš¹ý»¥ÁªÍøÀŽ»ñÈ¡ÒµÎñ¶©µ¥µÄµç×ÓÉÌÎñÓÅÐãÈíŒþ£¬ÄÜÊ¹ÄúÔ¶Àë·ÇµäÀ§ÈÅ£¬Íš¹ý»¥ÁªÍøÀŽÊµÏÖÓ¯Àû£¡     Ö»ÐèŒž·ÖÖÓ£¬ÉÌÖÇµç×ÓÉÌÎñÈíŒþ¿Éœ«ÄúµÄ²úÆ·»òÏîÄ¿ÐÅÏ¢ÔÚ1554ŒÒ¹©ÇóÐÅÏ¢ÆœÌš·¢²Œ¡¢2147ŒÒÍøÕŸÖÐËÑË÷ÄúÎŽÀŽµÄ¿Í»§¡£ÒÔ×îµÍµÄ³É±Ÿ¡¢ÓÃ×î¹ãµÄ×ÊÔŽ¡¢ŽŽ×îºÃµÄÐ§Òæ.ÈíŒþ×¢²áºÅ£ºÉîÛÚDGY-2002-0321     »¶ÓÏÂÔØÈíŒþÊÔÓÃ£¬Ãâ·ÑË÷È¡ÓÃ»§ÃûÓëÃÜÂë.³ÏÕ÷ºÏ×÷»ï°é¡£     ÇëÓÊŒþ»òÔÚÏßQQ:39398668 3203821 33669329  ÍõÐ¡œã Â¬ÏÈÉú</BODY></HTML> ÉÌÖÇµç×ÓÉÌÎñÈíŒþÉÌÎñ×ÉÑ¯

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I am just starting out
by Andy Schmidt 27 May '03

27 May '03

Hi, my name is Andy Schmidt and I stumbled across this website as I started my quest for the best programming language. I am only in college and I am trying to learn as many languages as I can. I hope haskell will be the one I stick with. -Andy _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

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Re:For All Educational Personnel
by epcinquire＠epcparts.com 26 May '03

26 May '03

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re: re: 你好
by 高明 26 May '03

26 May '03

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Italian-crafted Rolex - only $65 - $140!! Free SHIPPING ! !
by james＠hello.com 26 May '03

26 May '03

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monomorphism restriction
by John Meacham 24 May '03

24 May '03

Just a random thought, What would be the effect of lifting the monomorphism restriction under the condition that assignments which would normally be subject to the restriction must be memoized on the class constraint parameter by the implementation? it seems that this would solve the problems which inspired the monomorphism restriction since the value can be shared among all instantiations when the type is the same. I am posting this to haskell-cafe because it might just be half-baked. John -- --------------------------------------------------------------------------- John Meacham - California Institute of Technology, Alum. - john(a)foo.net ---------------------------------------------------------------------------

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Shooting yourself in the foot, a contribution
by Alain Cremieux 23 May '03

23 May '03

Hi, If I may contribute to the language definitions (http://burks.brighton.ac.uk/burks/language/index.htm) concerning *Haskell* : You shoot yourself in the foot. The gun fires half an hour later (lazy evaluation), blows your hand instead of your foot (polymorphism), and leaves you in a state of total amnesia (memory leaks). Alain

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RE: Shooting yourself in the foot, a contribution
by Simon Marlow 23 May '03

23 May '03

> In Haskell, it's provably impossible to shoot yourself in the foot > without using unsafeShootSelfInFoot. Curiously, this doesn't > stop people > using unsafeShootSelfInFoot in released software. You can always use shootSelfInFootIO, but you need to be in the IO monad and use the MutableFoot type. The purely functional version, shootSelfInFoot, requires human cloning and won't be available for a couple of releases. Cheers, Simon

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Question about Function Efficiency
by Matthew Donadio 22 May '03

22 May '03

Hi all, I want to create a function that creates a cascade of function applications: cascade [ f1, f2, f3 ] x == (f3 . f2 . f1) x It's a bit trivial, but it makes implementing flowgraphs (which are usually drawn left-to-right) a bit easier. I plan on profiling this, but which of the following do you think is the most efficient implementation: > cascade1 :: Num a => [[a] -> [a]] -> [a] -> [a] > cascade1 [] = \x -> x > cascade1 (f:fs) = cascade1 fs . f > cascade2 :: Num a => [[a] -> [a]] -> [a] -> [a] > cascade2 cs = foldr (.) (\x -> x) (reverse cs) > cascade3 :: Num a => [[a] -> [a]] -> [a] -> [a] > cascade3 cs = foldl (.) (\x -> x) (reverse cs) Thanks. -- Matthew Donadio <m.p.donadio(a)ieee.org>

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RE: getpid() or something similar
by Simon Marlow 22 May '03

22 May '03

> Hal Daume writes: > > > In GHC in the Posix module, there's GetProcessID: > > Thanks for the pointer! > > Unfortunately, this is a GHC-only solution, which is really annoying > in my case because the software is completely compiler-independent, > and I don't want to restrict it to GHC because I need it to determine > a unique file name for a temporary file! > > Is there no other way? I cannot be the first person ever to need a > temporary file, can I? Surely there must be some portable way, too? Even using a ProcessID doesn't guarnatee uniqueness, it just gives you a good chance that your file won't conflict - you still have to cope with the situation that a file with that name already exists. The right way to do this is to try to open it for writing, and try a different name if the open fails. Using System.Random to get a starting point is probably just as good as using the ProcessID, and is more portable. Cheers, Simon

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