On Wed, Jan 11, 2012 at 03:23, Conal Elliott wrote:
Is the standard pair-with-monoid monad instance in some standard place? I
see the Applicative instance in Control.Applicative, and the
pair-with-monoid Functor instance in Control.Monad.Instances, and the (-)
e and Either e monad instances
I used https://github.com/kennethreitz/osx-gcc-installer/downloads to
get a real gcc on Lion. Biggish download, but it worked. I've also
seen reports of success by self-compiling gcc, or by installing XCode
4 on top of an existing XCode 3 installation.
John L.
From: Eugene Kirpichov
On 11 Jan 2012, at 13:38, John Lato wrote:
I used https://github.com/kennethreitz/osx-gcc-installer/downloads to
get a real gcc on Lion. Biggish download, but it worked. I've also
seen reports of success by self-compiling gcc, or by installing XCode
4 on top of an existing XCode 3
Thanks, looks like I already succeeded by downloading xcode 3.
Now my original question remains - is such a change a good idea?
(I've already found the place in code where the fix has to be made; should
take an hour of work at most)
On Wed, Jan 11, 2012 at 6:07 PM, Hans Aberg haber...@telia.com
Hi Eugene,
I think I did run into this problem before, and had to turn of split-objs
temporarily to work around it. I'd appreciate a fix.
Best,
Ozgur
On 11 January 2012 14:14, Eugene Kirpichov ekirpic...@gmail.com wrote:
Now my original question remains - is such a change a good idea?
(I've
Based on your stated background, the best start would be the (longer)
paper on the Spineless Tagless G-machine [1]. It describes how graph
reduction is actually implemented efficiently. Since then there have
been two major changes to this basic implementation: Use of eval/apply
(a different
I have a program which does a lot of computations with Array's of
rationals. In order to get better performance I'd like to use unboxed
arrays, but, since (Ratio Int) isn't a primitive type this doesn't work.
It occured to me that I could rewrite this using -fglasgow-exts where I
represent a
You can use Data.Vector.Unboxed. There isn't an instance for Ratio a, but
it is easy to write one, since it would be very similar to Complex a.
http://hackage.haskell.org/packages/archive/vector/0.9.1/doc/html/Data-Vector-Unboxed.html#t:Unbox
___
Also, uvector already supports unboxed Ratios:
http://hackage.haskell.org/package/uvector
In fact, I am surprised that Data.Vector doesn't have a Ratio
instance, but has a Complex instance. Any ideas, why?
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On Wed, Jan 11, 2012 at 02:12, Eugene Kirpichov ekirpic...@gmail.comwrote:
I think a nice fix would be to employ gcc's ability to read options from a
file - gcc @file - and write overly long option strings into temp files.
What immediately occurs to me is, what if the problem (or another
Hi Brandon,
Thanks - looks like this would be a modification of the linking stage,
splitting it into two parts: batching objects and then actually linking
them.
Do you think that what I originally proposed is still a good thing to have
before implementing your solution? (it definitely would be
On Wed, Jan 11, 2012 at 14:50, Eugene Kirpichov ekirpic...@gmail.comwrote:
Do you think that what I originally proposed is still a good thing to have
before implementing your solution? (it definitely would be for myself, as
it's easier to do and I'd then quicker become able to build my
Hi all,
I've written a simple telnet client using Michael Snoyman's Conduit
library and was looking for comments as to whether I'm doing it
right. In particular, is my usage of a ResourceT to track a thread
a good idea, necessary or waste of time.
The code is here:
Hello,
(on unix) creating a process A which spawns itself a subprocess B and
terminating process A before it finishes leaves process B as a process on its
own. This is because terminateProcess sends the sigterm signal to the
process only and not to its process group.
Is there a way to
On Wed, Jan 11, 2012 at 16:26, André Scholz andre.sch...@uni-bremen.dewrote:
(on unix) creating a process A which spawns itself a subprocess B and
terminating process A before it finishes leaves process B as a process on
its
own. This is because terminateProcess sends the sigterm signal to
Quoth Brandon Allbery allber...@gmail.com,
...
terminateProcess passes on the semantics of kill(2); on SVID-compliant (and
I think POSIX.1-compliant) systems, the negative of the process group
leader's process ID is used to signal the process group. Note that you may
need to arrange for your
On 11/01/2012, at 17:00, Artyom Kazak wrote:
In fact, I am surprised that Data.Vector doesn't have a Ratio
instance, but has a Complex instance. Any ideas, why?
Nobody has asked for it so far.
Roman
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On line 29, instead of
liftIO $ do
mapM_ ...
runResourceT $ do
...
...
why not
liftIO $ mapM_ ...
...
...
?
Regarding threads, you should use resourceForkIO [1] which has a quite
nicer interface. So you telnet would end like:
telnet :: String - Int - IO ()
telnet
Thanks for the input Felipe.
Felipe Almeida Lessa wrote:
On line 29, instead of
liftIO $ do
mapM_ ...
runResourceT $ do
Well that was because that whole block needs to run in IO.
Regarding threads, you should use resourceForkIO [1] which has a quite
nicer interface.
I did
A new solution that drops two 'runResourceT' calls:
telnet :: String - Int - IO ()
telnet host port = runResourceT $ do
(releaseSock, hsock) - with (connectTo host $ PortNumber $ fromIntegral
port) hClose
liftIO $ mapM_ (\h - hSetBuffering h LineBuffering) [ stdin, stdout, hsock
]
On Wed, Jan 11, 2012 at 10:28 PM, Erik de Castro Lopo
mle...@mega-nerd.com wrote:
Thanks for the input Felipe.
Felipe Almeida Lessa wrote:
On line 29, instead of
liftIO $ do
mapM_ ...
runResourceT $ do
Well that was because that whole block needs to run in IO.
My point is
Felipe Almeida Lessa wrote:
What about inverting which thread gets to do what?
_ - resourceForkIO $ sourceHandle hsock $$ sinkHandle stdout
sourceHandle stdin $$ sinkHandle hsock
release releaseSock
Thats an interesting idea. Unfortunately this doesn't work correctly
in that if the
Hi,
With Prelude.catch, I could write catch () $ \_ - return Nothing.
But with Control.Exception.catch, I must specify a type for the _.
What should I do?
PS: In Java document, a function declaration would tell us both the
incoming args and outgoing, AND what exceptions would it throw. But it
On 01/12/12 13:03, Magicloud Magiclouds wrote:
Hi,
With Prelude.catch, I could write catch () $ \_ - return Nothing.
But with Control.Exception.catch, I must specify a type for the _.
What should I do?
Use SomeException for the type, as it is the base of the exception
hierarchy.
(Although
Hi all,
I have an idea about type classes that I have been experimenting. It
appears to be a generalization to Haskell’s type classes and seems to
be doable. It seems to related the three ideas: type classes, implicit
parameters, and (typed) dynamic scoping. But I don't know whether it
is good or
On 12 January 2012 17:34, Gregory Crosswhite gcrosswh...@gmail.com wrote:
On 01/12/12 13:03, Magicloud Magiclouds wrote:
Hi,
With Prelude.catch, I could write catch () $ \_ - return Nothing.
But with Control.Exception.catch, I must specify a type for the _.
What should I do?
Use
Yes, that is a problem. But consider my PS in original mail, I have no
idea what exception should I catch. Where could I get that
information?
On Thu, Jan 12, 2012 at 2:49 PM, Ivan Lazar Miljenovic
ivan.miljeno...@gmail.com wrote:
On 12 January 2012 17:34, Gregory Crosswhite
Use SomeException for the type, as it is the base of the exception
hierarchy.
But it is usually recommended that you *don't* do this, as it even
captures Ctrl-c invocations:
I think there are situation when it is justified to catch almost all
exceptions. And people do that a lot, which
On 01/12/12 16:49, Ivan Lazar Miljenovic wrote:
But it is usually recommended that you *don't* do this, as it even
captures Ctrl-c invocations:
Is that true in all threads, or just in the main thread?
Cheers,
Greg
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On 01/12/12 17:07, Simon Hengel wrote:
I think there are situation when it is justified to catch almost all
exceptions. And people do that a lot, which often leads to ctrl-c not
properly working (e.g. we had this in HUnit before 1.2.4.2).
Indeed, and in fact this situation is a very natural
On 01/12/12 17:23, Gregory Crosswhite wrote:
Indeed, and in fact this situation is a very natural occurrence whenever
you are writing code that takes an arbitrary IO action, executes it, and
then returns either the result or the exception that it threw. The code
that I last used for this took
On 01/12/12 16:58, Magicloud Magiclouds wrote:
Yes, that is a problem. But consider my PS in original mail, I have no
idea what exception should I catch. Where could I get that
information?
In my experience, exceptions fall into three categories.
First, when performing IO, some functions
Thank you so much. I was always confused by what exception should I catch.
On Thu, Jan 12, 2012 at 3:49 PM, Gregory Crosswhite
gcrosswh...@gmail.com wrote:
On 01/12/12 16:58, Magicloud Magiclouds wrote:
Yes, that is a problem. But consider my PS in original mail, I have no
idea what exception
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