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kxbmap/gist:921241

Created April 15, 2011 06:24
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Scala2.8.1でList[java.util.Date].min
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gistfile1.txt
scala> trait DateOrdering extends scala.math.Ordering[java.util.Date] {
| def compare(x: java.util.Date, y: java.util.Date) = x.compareTo(y)
| }
defined trait DateOrdering
scala> implicit object Date extends DateOrdering
defined module Date
scala> List(new java.util.Date()).min
res6: java.util.Date = Fri Apr 15 15:16:18 JST 2011
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