add Serializable to util classes

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

diff --git a/src/edu/berkeley/sbp/util/VisitableMap.java b/src/edu/berkeley/sbp/util/VisitableMap.java
index 314f55e..944f891 100644 (file)
--- a/src/edu/berkeley/sbp/util/VisitableMap.java
+++ b/src/edu/berkeley/sbp/util/VisitableMap.java
@@ -2,9 +2,10 @@
 
 package edu.berkeley.sbp.util;
 import java.util.*;
+import java.io.*;
 
 /** a Map that knows how to apply an Invokable to all its elements */
-public interface VisitableMap<K,V> {
+public interface VisitableMap<K,V> extends Serializable {
 
     /** invokes <tt>ivbc</tt> on each element of this map, passing constant arguments <tt>b</tt> and <tt>c</tt> */
     public <B> void invoke(K k, Invokable<V,B> ivbc, B b);