On Sun, Jun 5, 2011 at 11:00 AM, Yitzchak Gale <g...@sefer.org> wrote:
> If behind the scenes the concat is copying directly from slices of the > original > input, then no, in principle we're not saving much then. > I thought there were *two* copies going on. > If you're using the specialised functions like attoparsec's takeWhile, then all they do is return a view into the underlying array. No copying occurs until the concat itself. Now that I think of it: in principle, you could write a specialised concat that would check the pointer/offset/length combinations of its arguments and, if they all abutted perfectly, would just return a new view into that same array, sans copying. (You'd have to hide it behind unsafePerformIO, of course.)
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