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Relation.make

This commit is contained in:
Mark Harrah 2010-06-27 09:16:16 -04:00
parent c1b9cdb209
commit 3b8aeddbfb
1 changed files with 2 additions and 1 deletions
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3
util/collection/Relation.scala
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@ -6,7 +6,8 @@ package sbt
object Relation
{
/** Constructs a new immutable, finite relation that is initially empty. */
def empty[A,B]: Relation[A,B] = new MRelation[A,B](Map.empty, Map.empty)
def empty[A,B]: Relation[A,B] = make(Map.empty, Map.empty)
def make[A,B](forward: Map[A,Set[B]], reverse: Map[B, Set[A]]): Relation[A,B] = new MRelation(forward, reverse)
}
/** Binary relation between A and B. It is a set of pairs (_1, _2) for _1 in A, _2 in B. */
trait Relation[A,B]