From: Eric S. Raymond <esr@thyrsus.com>
Date: Fri, 22 Sep 2006 11:38:54 +0000 (+0000)
Subject: Abstract away the operations involving a sentinel value for coordinates.
X-Git-Tag: 2.0~203
X-Git-Url: https://jxself.org/git/?a=commitdiff_plain;ds=sidebyside;h=4207ce95e80fe7e2d5114079fa4255e0ad506618;hp=4207ce95e80fe7e2d5114079fa4255e0ad506618;p=super-star-trek.git

Abstract away the operations involving a sentinel value for coordinates.

Besides making the code more readable, the sentinel may change someday
if we go zero-origin everywhere.
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