On Fri, 2007-06-29 at 19:35 +0200, Thomas Schilling wrote: > On 27 jun 2007, at 18.41, Hans van Thiel wrote: > > > [snip] > > > > Thanks, Apfelmus, for the references. Guess I'll start there, then. > > And > > thanks, Chris, for the info and code. Read only 'up pointers' could be > > what is needed. But before going on, I want first to get more > > confortable with programming with trees. It's all very well to say > > they're easy to roll, but lists are even simpler, and look at them... > > I guess it's in the papers, too, but the chapter on zippers in the > Wikibook is very nice, too: > > http://en.wikibooks.org/wiki/Haskell/Zippers > > / Thomas Yes, I've seen this. Thanks! Regards, Hans
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