1 files changed, 9 insertions, 5 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/database/ids/integer/IntegerDBIDRange.java b/src/de/lmu/ifi/dbs/elki/database/ids/integer/IntegerDBIDRange.java
index e418db5f..4b8aed26 100644
--- a/src/de/lmu/ifi/dbs/elki/database/ids/integer/IntegerDBIDRange.java
+++ b/src/de/lmu/ifi/dbs/elki/database/ids/integer/IntegerDBIDRange.java
@@ -4,7 +4,7 @@ package de.lmu.ifi.dbs.elki.database.ids.integer;
  This file is part of ELKI:
  Environment for Developing KDD-Applications Supported by Index-Structures
 
- Copyright (C) 2013
+ Copyright (C) 2014
  Ludwig-Maximilians-Universität München
  Lehr- und Forschungseinheit für Datenbanksysteme
  ELKI Development Team
@@ -184,23 +184,27 @@ final class IntegerDBIDRange implements IntegerDBIDs, DBIDRange, SetDBIDs {
     }
 
     @Override
-    public void advance() {
+    public Itr advance() {
       ++pos;
+      return this;
     }
 
     @Override
-    public void advance(int count) {
+    public Itr advance(int count) {
       pos += count;
+      return this;
     }
 
     @Override
-    public void retract() {
+    public Itr retract() {
       --pos;
+      return this;
     }
 
     @Override
-    public void seek(int off) {
+    public Itr seek(int off) {
       pos = off;
+      return this;
     }
 
     @Override