It is well known that type classes in Haskell are open. A user may at
any time extend a visible type class by providing a new
instance. There are situations where such an extensibility is
undesirable. We may want to prevent the user from adding an instance
to our class for some specific type -- or
This really really should have moved to haskell-cafe as previously
suggested (sending to both with this in mind); apologies for being a
little confising to haskell-cafe
This isn't a language design issue, it is a FAQ, or at best a nebulous
conceptual debate (speaking of which, has anyone got somet
Thomas Davie writes, commenting my statement that one does need any
'stateful' (monadic, etc.) RN generator initializer within the program,
since you can always pass a parameter during its launching.
While I agree that it is often useful to start your program with different
parameters each time
On 11 Nov 2004, at 22:02, karczma wrote:
Thomas Davie writes:
This method unfortunately depends on having a seed first though.
Which "this method"? Please, quote the text you are referring to
*before*
your answer.
One must use a different value every time the program is started,
commonly time or
Thomas Davie writes:
This method unfortunately depends on having a seed first though.
Which "this method"? Please, quote the text you are referring to *before*
your answer.
One must
use a different value every time the program is started, commonly time or
the first few bytes from /dev/rando
This method unfortunately depends on having a seed first though. One
must use a different value every time the program is started, commonly
time or the first few bytes from /dev/random. Any one of these is
going to require a monadic function to generate (i.e. it must come from
the environment
Georg Martius answers the request of:
Jose Manuel Hernando CobeÃa
I need generate random numbers by create polygons with "wxHaskell",
I am searching in the web, but all I only find IO functions like
test :: Integer -> IO Integer
...
I need this but with types :: Integer -> Integer
you need to rea
Graham Klyne <[EMAIL PROTECTED]> writes:
> I raise a topic that has occurred to me repeatedly during my time with
> Haskell. I am prompted to do so by a discussion in another place, where a
> significant (and, apparently, recurring) concern about the use and abuse of
> Java's toString() function
Hi,
you need to reallise that Haskell is a pure language. That means a function has
the same result if you call it with the same arguments (deterministic). A
function that produces random numbers are not of such kind in the first place.
However, what you need to do is to pass the random number ge
I need generate random numbers by create polygons with "wxHaskell",I am searching in the web, but all I only find IO functions like>> test :: Integer -> IO Integer>> test n = do x <- randomRIO (1, n) return xI need this but with types :: Integer -> Integer
ThanksEscapa
I raise a topic that has occurred to me repeatedly during my time with
Haskell. I am prompted to do so by a discussion in another place, where a
significant (and, apparently, recurring) concern about the use and abuse of
Java's toString() function is being raised.
It seems to me that there are
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