Sittampalam, Ganesh wrote:
We've discussed replacing it with transformers+monads-fd+an mtl
compatiblity layer on librar...@. Ross and I plan to propose doing this
for the second release of the platform - it's not fair to disrupt the
first release at this stage.
transformers+monads-fd is quite a small evolution over mtl - it factors
out the fundeps into a separate package, tightens up some of the class
constraints, and makes State = StateT Identity etc rather than a
separate type. Even this breaks a few packages, but doing anything more
substantial would be quite disruptive. That's not to say that we
shouldn't do it, though.
For those of us wishing to target applications to the Haskell platform
(e.g. our software works on Haskell Platform 2009.2, 2009.8, etc) will
there be an easy way to determine which Haskell platform is currently
installed so that we can accommodate any such incompatible changes?
E.g. if Haskell platform = 2009.2 then use libraries mtl, parsec and
#define HP_VERSION 200902, if Haskell platform = 2009.8 then use
libraries transformers+monads-fd, parsec-compatibility, and #define
HP_VERSION 200908.
Or am I looking at things the wrong way, and we should instead just use
autoconf-like tests for individual libraries, regardless of the platform
(if they have mtl, use mtl and #define USE_MTL, otherwise try
transformers+monads-fd, otherwise error)?
Thanks,
Neil.
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