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Whoops! I made some mistakes. On Mon, Oct 20, 2003 at 05:44:29PM -0700, Bradd W. Szonye wrote: > Also, "insert-left" and "insert-right" should probably be "add-left" > and "add-right." That way, INSERT and DELETE always require an index > or key, REMOVE always requires a value, and ADD never requires any of > them. No, this isn't right. Now that I think of it, bags should only have ADD. If the bag is unordered, then ADD-LEFT and ADD-RIGHT don't make sense. Nor do they make sense for an ordered bag -- they'd probably violate the ordering. > Likewise, dictionaries should probably use INSERT and DELETE instead > of PUT and REMOVE .... And this isn't right either. I keep thinking that sequences and dictionaries are basically the same thing, but they aren't. A sequence has an implicit, numeric ordering. A dictionary has an explicit, arbitrary way to look up values. While many people do try to unify them -- the C++ standard library uses the same syntax for vector and dictionary indexing, for example -- they really aren't the same thing. I think the procedures do need an overhaul, but this initial suggestion was dead wrong. Please give me a little time to go through them and suggest a more sensible set of procedures. -- Bradd W. Szonye http://www.szonye.com/bradd