[Template-haskell] Stuck... is it even possible?
Tim Newsham
newsham at lava.net
Fri Jan 20 04:51:39 EST 2006
I'm having problems with my template generator. I have everything
working except for the "flen" function which I'm faking for now:
http://lava.net/~newsham/x/jethr0/
The directory has 4 source files (with or without .txt extensions for
your browsing enjoyment):
ByteContainer.lhs - defining my classes
IP.lhs - defining my test data type
Gen.lhs - defining my TH generator
tst.lhs - my test case.
You can see it go by running "ghc -c -fth -ddump-splices tst.lhs".
The problem: flen should compute and return the size of each field.
Concretely:
flen ("Word8",_,_) should compute "containerLength newWord8"
flen ("Word16",_,_) should compute "containerLength newWord16"
flen ("IP",_,_) should compute "containerLength newIP"
flen (n,_,_) should compute "containerLength" of ("new"++n)
The flen function is used during template generation, and needs to
know the integer length while expanding the template (ie. flen doesnt
generate anything).
Is this possible?
Tim Newsham
http://www.lava.net/~newsham/
More information about the template-haskell
mailing list