Hi Alexander,
this does the trick!
Günther
Alexander Dunlap schrieb:
Well you can do
deriving instance Typeable LocalType
etc. if you enable the DeriveDataTypeable and StandaloneDeriving
extensions. You will get other error messages for missing instances;
just keep adding
deriving instance Typeable Day
etc. Eventually, you will need to implement an instance by hand for
Pico, because Pico's data constructors are not exported from
Data.Fixed. I'm not very familiar with Data and Typeable so I can't
help you there, but you can probably look at some existing instances
for help.
Hope that's useful for you.
Alex
On Sun, Mar 8, 2009 at 12:40 PM, Gü?nther Schmidt <gue.schm...@web.de> wrote:
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 <red...@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.schm...@web.de
<mailto:gue.schm...@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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