[Haskell-cafe] Some random newbie questions
paul.hudak at yale.edu
Fri Jan 7 08:49:32 EST 2005
Benjamin Pierce wrote:
> OK, I'm taking the plunge and using Haskell in a course I'm teaching this
> semester. To get ready, I've been doing quite a bit of Haskell programming
> myself, and this has raised a few questions...
> * What are the relative advantages of Hugs and GHC, beyond the obvious (Hugs
> is smaller and easier for people not named Simon to modify, while GHC is a
> real compiler and has the most up-to-date hacks to the type checker)? Do
> people generally use one or the other for everything, or are they similar
> enough to use Hugs at some moments and GHC at others?
I taught our FP class this fall using Hugs, but in the end wish that I
had used GHC. There are lots of little reasons for this, but a big one
was a problem with unpredictable space utilization. I don't have the
examples at my fingertips, but there were simple variations of the same
program that, by all common-sense reasoning, should have behaved in the
opposite way with respect to space than what they exhibited. Indeed,
the problem that you report in your "Sierpinkski Carpet" may likely be a
problem with Hugs, and not the graphics lib, and Jacob Nelson's message
seems to bear this out.
SOEGraphics, by the way, is built on top of HGL, a general graphics lib
written by Alastair Reid. At the time, it was the best option that we
had, but Alastair no longer has time to maintain it, although I believe
that Ross Paterson may be maintaining it now. In any case, SOEGraphics
has grown a big buggy with respect to portability across platforms and
compilers. I am about to update the SOE webpage with our current best
shot at a portable and bug-free version of this, but ultimately I'd like
to port everything over to something like wxHaskell.
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