[Template-haskell] example of derive using Template Haskell?
S. Alexander Jacobson
alex at alexjacobson.com
Thu Jan 13 22:53:10 EST 2005
Uhm. Ok, so I guess the question is then...
What is acceptable in 6.2 or is 6.4 coming out
On Fri, 14 Jan 2005, Sean Seefried wrote:
> On 14/01/2005, at 7:22 AM, S. Alexander Jacobson wrote:
>> This is really great. Do you have an example of use of each of these
>> e.g. do I do:
>> $(derive [Int,String,MyTime])
>> $(derive ["Int","String","MyTime"])
> Oh dear, I've just realised a problem. This code only works with GHC 6.3.
> Template Haskell has changed a lot since GHC 6.2.
> What you should type is
> $(derive [ ''Int, ''String, ''MyTime ])
> The '' syntax means "get the name of this type". There is also a single quote
> syntax ' which means "get the name of this variable". This is new syntax
> introduced with Template Haskell.
S. Alexander Jacobson tel:917-770-6565 http://alexjacobson.com
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