NEW BOOK FROM CAMBRIDGE UNIVERSITY PRESS (CUP)
'The Haskell School of Expression: Learning Functional Programming through
Multimedia', by Paul Hudak (Yale)
Paperback £18.95, ISBN: 0521644089
Hardback £52.50, ISBN: 0521643384
Publication April 2000
This book teaches functional programming as a w
As people notice, the overlapping instances reveal certain
question about the deduced type contexts.
Consider the example *similar* to one someone recently presented
(probably, M.Kowalczyk):
f :: (Eq a) => Int -> a -> a -> Int
f n x y =
if
n==0 then 0
else if x==
Marcin 'Qrczak' Kowalczyk <[EMAIL PROTECTED]>
wrote on overlapping instances
> The other issue is efficiency if you want f to behave the same way even
> when the instance Eq (Maybe String) is not visible at f's definition.
> It would mean that every overloaded function must be extended to
> di
On Mon, 28 Feb 2000, S.D.Mechveliani wrote:
> If we want the recent implementations to compile this as needed, we
> have to write
> g :: (Eq a, Eq (Maybe a)) => (a -> Bool) -> [a] -> [Bool]
>
> g h xs@(x:_) = (Just x == Just x) : map h xs
>
> - "because this g us
"S.D.Mechveliani" wrote:
> overlaps with the standard instance Eq a => Eq [a] ...
> and causes, in the existing implementations, many error reports -
> until the user satisfies everything by typing
>
> f :: (Eq a,Eq [a],Eq [[a]],Eq [[[a]]],Eq a,
> Eq [a],Eq [[a]
Tue, 29 Feb 2000 13:26:00 +0300 (MSK), S.D.Mechveliani <[EMAIL PROTECTED]> pisze:
> I propose for the user to remain with `Eq a =>'.
> Let the compiler itself deduce and add the needed context.
No, no, no.
Would the function really have the type that is specified, or the
one with extended conte
Tue, 29 Feb 2000 14:20:32 +0300 (MSK), S.D.Mechveliani <[EMAIL PROTECTED]> pisze:
> > h :: Eq a => a -> a -> Int
> > h x y = if x == y then 0 else 1 + h [x] [y]
> > which would make h "1" "2" return 7 if in some other module there is:
> > instance Eq [[[String]]] where
> >
Hello,
I am trying to build the HaXML stuff and the linker (ld) is
looking for an archive, gmp.a, which I don't have installed. Can
anybody lead me in the right direction??
Thanks,
Bill Halchin
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We are pleased to announce the next release of Classic Hugs, a
Haskell interpreter and programming environment for developing
cool Haskell programs. Sources and binaries are freely available
by anonymous FTP and on the World-Wide Web. The release and
supporting documents can be d
