On 2/11/11 11:49 PM, Adam Chlipala wrote:

This is the behavior I meant to implement (though I don't have a solid story on 0-vs.-1-based numbering for the two dimensions!).
This appears to be almost universally standard.

Think of the first position as pointing to the first character in question and the second position as pointing right _after_ the last character in question. Among other properties, this scheme makes it possible to distinguish an empty region from a 1-character region.

As does this.

--Gian


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