[Haskell-cafe] Re: derive & Drift - some help please

[Gü?nther Schmidt]

Hi Alexander,


well I have this:

newtype AdmissionDate = AdmDt LocalTime
	deriving (Data,Typeable ..)

at least that's where I wonna get.

I don't know how to create the proper instance declarations though for 
LocalTime.

AdmissionDate is an element of a larger data structure, this data 
structure for instance also has a

newtype DischargeDate = DchrgDt LocalTime
	deriving (Data,Typeable ...)

With my haskell work so far I was blessedly free of the need for 
deriving. Until now ...

Günther


Alexander Dunlap schrieb:
> What problems are you encountering?
> 
> Alex
> 
> On Sun, Mar 8, 2009 at 11:58 AM, G?uenther Schmidt <redcom at fedoms.com> wrote:
>> Hi Sterling,
>>
>> sry, but I can't get it to work.
>>
>> Günther
>>
>> Sterling Clover schrieb:
>>> You shouldn't need any extra tools for this. A combination of the
>>> StandaloneDeriving and DeriveDataTypeable extensions in GHC should suffice.
>>>
>>> Cheers,
>>> S.
>>>
>>> On Sun, Mar 8, 2009 at 10:30 AM, Gü?nther Schmidt <gue.schmidt at web.de
>>> <mailto:gue.schmidt at web.de>> wrote:
>>>
>>>    Hi,
>>>
>>>    I need to derive Data, Typeable for Data.Time.LocalTime. I had hoped
>>>    to use either derive or DrIFT to generate the instance declarations
>>>    for it.
>>>
>>>    I tried to understand the respective user manuals but it's still all
>>>    Greek to me.
>>>
>>>    Someone please help!
>>>
>>>    Günther
>>>
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