[Haskell-cafe] Re: (flawed?) benchmark : sort
ketil at malde.org
Mon Mar 10 10:40:23 EDT 2008
Adrian Hey <ahey at iee.org> writes:
> But seriously, once you admit the possibility that even if x == y it
> still matters which of x or y is used in expressions than all hell
> breaks loose. I shudder to think just how much Haskell code there must
> be out there that is (at best) ambiguious or just plain "broken" if
> this is a serious possibility.
Just search for "copy" (on ByteStrings).
One program of mine was extracting substrings from a large
file. Since the file was pretty huge, I used lazy bytestrings for this
purpose. Unfortunately, the short substrings I retained pulled with them
rather large chunks from the file -- since a bytestring is essentially
a pointer to a chunk, an offset, and a length. The solution is
"copy", which creates a new string, indistinguishable from within
Haskell, but with very different effects on the program.
If I haven't seen further, it is by standing in the footprints of giants
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