Hi all.
I've seen two definitions of a 'strict function', which I'm trying to
unite in my mind:
1) f is strict iff f _|_ = _|_.
2) f is strict iff it forces evaluation of its arguments.
There is a large sticking point that in my minds seems to fit (1) but
not (2): id. Clearly, id undefined is
On 29.07 14:07, Brian Sniffen wrote:
I'm very excited by the ability to pass functions or IO actions
between threads of the same program. But I don't see any language or
library support for doing so between programs, or between sessions
with the same program. OCaml provides a partial
David House [EMAIL PROTECTED] writes:
Hi all.
I've seen two definitions of a 'strict function', which I'm trying to
unite in my mind:
1) f is strict iff f _|_ = _|_.
2) f is strict iff it forces evaluation of its arguments.
There is a large sticking point that in my minds seems to fit
On Sun, Jul 30, 2006 at 09:44:25AM +0100, David House wrote:
I've seen two definitions of a 'strict function', which I'm trying to
unite in my mind:
1) f is strict iff f _|_ = _|_.
2) f is strict iff it forces evaluation of its arguments.
There is a large sticking point that in my minds
Hi -
Part 1 of 2 - Monoid versus MonadPlus
===
I've just run into a troublesome question when trying to design a sequence
class:
class ISeq c a | c - a where
empty :: c
single :: a - c
append :: c - c - c
However I've noticed that people
On 30/07/06, Ian Lynagh [EMAIL PROTECTED] wrote:
If the value of (id x) is demanded then the value of x will always be
demanded. Therefore id is strict in its first argument.
...
In place of your 2), I would say
(f x0 .. xn) is strict in xi if demanding the value of (f x0 .. xn)
requires
* SevenThunders:
OK it was stupid. Apparently GHC behaves differently according to what the
name of the high level source file is. If I renamed test.hc to main.hc
everything works the same as GHCi. I probably should actually read the
manual some day.
Some operating systems have a test
On Sun, 2006-07-30 at 10:56 +0100, Jón Fairbairn wrote:
David House [EMAIL PROTECTED] writes:
Hi all.
I've seen two definitions of a 'strict function', which I'm trying to
unite in my mind:
1) f is strict iff f _|_ = _|_.
2) f is strict iff it forces evaluation of its arguments.
Duncan Coutts [EMAIL PROTECTED] writes:
On Sun, 2006-07-30 at 10:56 +0100, Jón Fairbairn wrote:
David House [EMAIL PROTECTED] writes:
1) f is strict iff f _|_ = _|_.
2) f is strict iff it forces evaluation of its arguments.
In (2), you have to be evaluating f on an argument before f
On Sun, 2006-07-30 at 15:01 +0100, allan wrote:
however with version 6.4.2 I get the following error:
haskellprint$ ./Setup.hs build
Preprocessing executables for haskellprint-0.1...
Building haskellprint-0.1...
Chasing modules from: Main.hs
Could not find module
On Sun, 2006-07-30 at 13:22 +0100, Jón Fairbairn wrote:
Duncan Coutts [EMAIL PROTECTED] writes:
On Sun, 2006-07-30 at 10:56 +0100, Jón Fairbairn wrote:
David House [EMAIL PROTECTED] writes:
1) f is strict iff f _|_ = _|_.
2) f is strict iff it forces evaluation of its arguments.
The Text.ParserCombinators.Parsec modules are in the parsec module.
build-depends: base
Add parsec here:
build-depends: base, parsec
The reason it works when you run it without -hide-all-packages is that
by default for convenience all packages are 'exposed'. That is they can
be
Hi
so basically I was expecting 'Char' to be in the 'base' package, I guess
this is wrong?
Yes, Char is in the haskell98 package, the new name for Char is
Data.Char which exports a bit more. Either add haskell98 as a package,
or replace Char with Data.Char (which is in base), I'd recommend
Yes, Char is in the haskell98 package, the new name for Char is
Data.Char which exports a bit more. Either add haskell98 as a package,
or replace Char with Data.Char (which is in base), I'd recommend the
latter, but either should work.
Thanks
Neil
a ha, that works, thank you both very much,
On Sunday 30 July 2006 07:47, Brian Hulley wrote:
Hi -
Part 1 of 2 - Monoid versus MonadPlus
===
I've just run into a troublesome question when trying to design a sequence
class:
class ISeq c a | c - a where
empty :: c
single :: a - c
On 7/30/06, Einar Karttunen ekarttun@cs.helsinki.fi wrote:
On 29.07 14:07, Brian Sniffen wrote:
I'm very excited by the ability to pass functions or IO actions
between threads of the same program. But I don't see any language or
library support for doing so between programs, or between
Yes I do have another test on my path. It is in a utilities directory of
unix like commands that have been ported to windows. However I also have a
test.exe that was created by ghc that seems to do nothing, even if I type
./test.exe. Thanks for the hint though.
--
View this message in
Florian Weimer wrote:
* SevenThunders:
OK it was stupid. Apparently GHC behaves differently according to what
the
name of the high level source file is. If I renamed test.hc to main.hc
everything works the same as GHCi. I probably should actually read the
manual some day.
Some
On 30.07 12:12, Jason Dagit wrote:
Depending on the type of sandboxing that you need/want #2 might be
possible with GHC. Take lambdabot for example. lambdabot has made it
safe to allow arbitrary expression evaluation by disallowing IO and
not importing unsafePerformIO and similar unsafe
Robert Dockins wrote:
On Sunday 30 July 2006 07:47, Brian Hulley wrote:
Another option, is the Edison library which uses:
class (Functor s, MonadPlus s) = Sequence s where
so here MonadPlus is used instead of Monoid to provide empty and
append. So I've got three main questions:
1) Did
Hi everyone -
I'm very much a Haskell newbie, but have followed Haskell (and the
various Haskell sites) for quite a few months now, and I absolutely
*love* the language.
One thing that **fascinated** me a while ago was the site which gave
Haskell code for a Haskell-based fileserver/OS using
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