From ccb3a840c68baebe89620f3fa895ab30ff240061 Mon Sep 17 00:00:00 2001
From: Mark Harrah <dmharrah@gmail.com>
Date: Fri, 17 Sep 2010 20:46:31 -0400
Subject: [PATCH] Attributed, attaches attributes to arbitrary data

---
 util/collection/Attributes.scala | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/util/collection/Attributes.scala b/util/collection/Attributes.scala
index 488142ad7..4037884dd 100644
--- a/util/collection/Attributes.scala
+++ b/util/collection/Attributes.scala
@@ -53,4 +53,13 @@ private class BasicAttributeMap(private val backing: Map[AttributeKey[_], Any])
 final case class AttributeEntry[T](a: AttributeKey[T], b: T)
 {
 	override def toString = a.label + ": " + b
+}
+
+final case class Attributed[D](data: D)(val metadata: AttributeMap)
+{
+	def put[T](key: AttributeKey[T], value: T): Attributed[D] = Attributed(data)(metadata.put(key, value))
+}
+object Attributed
+{
+	implicit def blank[T](data: T): Attributed[T] = Attributed(data)(AttributeMap.empty)
 }
\ No newline at end of file