add Serializable to util classes

[sbp.git] / src / edu / berkeley / sbp / util / TopologicalBag.java

diff --git a/src/edu/berkeley/sbp/util/TopologicalBag.java b/src/edu/berkeley/sbp/util/TopologicalBag.java
index eb71cdc..e3bd1b7 100644 (file)
--- a/src/edu/berkeley/sbp/util/TopologicalBag.java
+++ b/src/edu/berkeley/sbp/util/TopologicalBag.java
@@ -14,7 +14,7 @@ import java.lang.ref.*;
 //
 
 /** a mapping from topologies over <tt>K</tt> to <i>sets of</i> values of type <tt>V</tt> */
-public class TopologicalBag<K,V> implements MapBag<Topology<K>,V>, VisitableMap<K,V> {
+public class TopologicalBag<K,V> implements MapBag<Topology<K>,V>, VisitableMap<K,V>, Serializable {
 
     // CRUCIAL INVARIANT: keys in this hashmap MUST be disjoint or the universe will implode
     private final HashMap<Topology<K>,HashSet<V>> h = new HashMap<Topology<K>,HashSet<V>>();