Thanks Roman. Tried it and implemented, but had troubles until I realized that
for String, 10 test take quite long. :-)
However, I decided to solve this problem in a more natural way
Original Message
Subject: Re: [Haskell-cafe] Comparing functions
From: Roman Cheplyaka r
Hello Cafe,
I have
data CmpFunction a = CF (a - a - Bool)
that contains comparing functions, like ==, , ..., and I'm trying to declare
the Show instance for it like this
instance Show (CmpFunction a) where
show (CF (==)) = ==-- no good
show f = case
On Thu, Jul 11, 2013 at 1:33 PM, Vlatko Basic vlatko.ba...@gmail.comwrote:
data CmpFunction a = CF (a - a - Bool)
that contains comparing functions, like ==, , ..., and I'm trying to
declare the Show instance for it like this
instance Show (CmpFunction a) where
show (CF
On 07/11/2013 07:33 PM, Vlatko Basic wrote:
Hello Cafe,
I have
data CmpFunction a = CF (a - a - Bool)
that contains comparing functions, like ==, , ..., and I'm trying to
declare the Show instance for it like this
instance Show (CmpFunction a) where
show (CF (==)) = ==
Original Message
Subject: Re: [Haskell-cafe] Comparing functions
From: Brandon Allbery allber...@gmail.com
To: Vlatko Bašić vlatko.ba...@gmail.com
Cc: Haskell-Cafe haskell-cafe@haskell.org
Date
* Vlatko Basic vlatko.ba...@gmail.com [2013-07-11 19:33:38+0200]
Hello Cafe,
I have
data CmpFunction a = CF (a - a - Bool)
that contains comparing functions, like ==, , ..., and I'm trying
to declare the Show instance for it like this
instance Show (CmpFunction a) where
On Thu, Jul 11, 2013 at 10:50 AM, Brandon Allbery allber...@gmail.comwrote:
... but functions don't have an Eq instance, and *can't* have one.
Not a general one that's interesting.
There are two Eq instances that'll compile for all functions (not that it's
advisable):
instance Eq ((-) a b)
On Thu, Jul 11, 2013 at 2:11 PM, Vlatko Basic vlatko.ba...@gmail.comwrote:
The problem here isn't quite what you think it is; (==) is not a
constructor, therefore it is a *variable*. It's exactly the same problem as
a = 5
-- ...
foo a = 3 -- this does NOT compare with the
Original Message
Subject: Re: [Haskell-cafe] Comparing functions
From: Brandon Allbery allber...@gmail.com
To: Vlatko Bašić vlatko.ba...@gmail.com
Cc: Haskell-Cafe haskell-cafe@haskell.org
Date
On Thu, Jul 11, 2013 at 2:58 PM, Vlatko Basic vlatko.ba...@gmail.comwrote:
Hm, I thought it is a pattern match with constant, as in f ('a':xs) ==
I wonder what you'd make of this definition, then?
(*) `on` f = \x y - f x * f y
According to the enlightenment above, I'd say (*) is a
Original Message
Subject: Re: [Haskell-cafe] Comparing functions
From: Brandon Allbery allber...@gmail.com
To: Vlatko Bašić vlatko.ba...@gmail.com
Cc: Haskell-Cafe haskell-cafe@haskell.org
Date
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