Folks,
Does anyone have QuickCheck examples they could send me?
Also, how can I check Word32, Word64, etc. properties? It looks like
the built-in random generator only works with Int values and for the
life of me I cannot figure out how to extend it.
Last but not least, I'm trying to
On 10/27/05, Joel Reymont [EMAIL PROTECTED] wrote:
Folks,
Does anyone have QuickCheck examples they could send me?
Also, how can I check Word32, Word64, etc. properties? It looks like
the built-in random generator only works with Int values and for the
life of me I cannot figure out how to
Would it cover the range between minBound :: Word32 and maxBound ::
Word32? I cannot figure out how to do this since maxBound :: Int32 is
less that that of Word32.
Also, I get the following error with ghci -fglasgow-exts
foo.hs:7:52: parse error on input `.'
--
module Foo where
import
On 10/27/05, Joel Reymont [EMAIL PROTECTED] wrote:
Would it cover the range between minBound :: Word32 and maxBound ::
Word32? I cannot figure out how to do this since maxBound :: Int32 is
less that that of Word32.
Also, I get the following error with ghci -fglasgow-exts
foo.hs:7:52: parse
On 10/27/05, Sebastian Sylvan [EMAIL PROTECTED] wrote:
On 10/27/05, Joel Reymont [EMAIL PROTECTED] wrote:
Would it cover the range between minBound :: Word32 and maxBound ::
Word32? I cannot figure out how to do this since maxBound :: Int32 is
less that that of Word32.
Also, I get the
I came up with this but can it be done better? I'm wishing for
default class methods :-).
instance Arbitrary Word16 where
arbitrary = arbitraryBound
coarbitrary a = error Not implemented
instance Arbitrary Word32 where
arbitrary = arbitraryBound
coarbitrary a = error Not
How about this?
class ArbitraryDefault a where {}
instance (Integral a, Bounded a, ArbitraryDefault a) = Arbitrary a where
arbitrary = arbitraryBound
coarbitrary a = error Not implemented
instance ArbitraryDefault Word16
instance ArbitraryDefault Word32
instance ArbitraryDefault
This requires
{-# OPTIONS_GHC -fallow-undecidable-instances #-}
but since I'm using -fglasgow-exts in a lot of places I'm wondering
if adding undecidable instances would be a bad habit. I guess not...
not until I shoot myself in the foot :-).
Any explanation of undecidable instances, the
I've not had any problems with them, though of course your mileage may
vary. Have a look at section 7.4.4.3 in
http://www.haskell.org/ghc/docs/latest/html/users_guide/type-extensions.html#multi-param-type-classes
for an explanation. Basically, if you have a cyclic class dependency
graph, the
On Thu, 27 Oct 2005, Sebastian Sylvan [EMAIL PROTECTED] wrote:
instance Arbitrary Word32 where
arbitrary = do c - arbitrary :: Gen Integer
return (fromIntegral c)
This definition will usually only generate very small or very large
Word32 values. The reason is the wrapping
Just one more question...
data Prop = forall a b. (Eq a, Eq b, Show a, Packet b, Convertible a b)
= Attr a b := a
deriving (Typeable)
data Attr a b = Attr String
(a - Dynamic, Dynamic - Maybe a)
(a - b, b - a)
makeAttr :: (Typeable a, Convertible a b) = String - Attr a b
This compiles:
instance (Typeable a, Arbitrary a, Typeable b, Arbitrary b,
Convertible a b) = Arbitrary (Attr a b) where
arbitrary = makeAttr `fmap` arbitrary
coarbitrary a = error Not implemented
arbitraryProp :: forall a b.(Eq a, Packet b, Show a, Convertible a b,
Arbitrary a,
On Thu, Oct 27, 2005 at 07:06:12PM +0100, Joel Reymont wrote:
This requires
{-# OPTIONS_GHC -fallow-undecidable-instances #-}
but since I'm using -fglasgow-exts in a lot of places I'm wondering
if adding undecidable instances would be a bad habit. I guess not...
not until I shoot
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