ghc-4.02 and hugs98-March99 perform differently the program
main = getChar putStr "finished"
ghc accepts the input keys a, b ... without proceeding to putStr,
finally, the Enter key forces this putStr.
hugs gets to putStr after any first key stroke (which was my aim).
What is the recent implementors disposition concerning Int vs Integer
cost?
Hugs-98-March99, ghc-4.02 (-O -O2-for-C) show the ratio about 4.
So, my program introduces type PPInt to be switched Int/Integer
to represent integers in the polynomial exponents.
This causes certain complication:
But how important is having a fold well defined. For many common
numerical operations such as summing a list, taking the product of a
list, etc. The order in which the elements get folded does not matter.
All that matters is that each element gets represented exactly once.
From an algebraic
Chris Okasaki wrote:
Unfortunately, it's not quite that easy. For a library with several
implementations
of, say, sets, you want the various implementations to support the same
fold function. In other words, in a library with abstract data types, you
want
the folds to be over the
