[Haskell] System.FilePath survey
kr.angelov at gmail.com
Mon Feb 6 09:47:51 EST 2006
2006/2/6, David Roundy <droundy at abridgegame.org>:
> Actually couldn't they all be made polymorphic?
> getDirectoryContents :: FilePath p => IO p
> class FilePath p where
> fromADT :: ADT -> p
> toADT :: p -> ADT
Would you mean that we should have two instances:
instance FilePath String where ....
instance FilePath ADT where ....
It will work but I think that it is unnecessary complication. I prefer
to use type classes only when they are really necessary i.e. when I
have more than 2-3 instances or when I expect to have a lot of generic
code that should work on both types. I think that if we should switch
from plain String to ADT then this should be made for a new i/o
library (the Handle(s) replacement) which will change the thing a lot
in any way. For the current library I think that the plain String is
more reasonable. If the general consensus is that ADT is the way to go
then I think some effort on a new efficient IO library be forced. It
- FilePath ADT
- Packed string
- Fast I/O with unicode support
I know some pieces already exists but they need integration and polishing.
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