Abstract away the operations involving a sentinel value for coordinates.
authorEric S. Raymond <esr@thyrsus.com>
Fri, 22 Sep 2006 11:38:54 +0000 (11:38 +0000)
committerEric S. Raymond <esr@thyrsus.com>
Fri, 22 Sep 2006 11:38:54 +0000 (11:38 +0000)
Besides making the code more readable, the sentinel may change someday
if we go zero-origin everywhere.


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