1 files changed, 8 insertions, 1 deletions
diff --git a/db/queryutil.h b/db/queryutil.h
index 936bd4d575a..701b40ea09a 100644
--- a/db/queryutil.h
+++ b/db/queryutil.h
@@ -143,7 +143,14 @@ namespace mongo {
         map< string, Type > fieldTypes_;
         BSONObj sort_;
     };
-    
+
+    // a BoundList contains intervals specified by inclusive start
+    // and end bounds.  The intervals should be nonoverlapping and occur in
+    // the specified direction of traversal.  For example, given a simple index {i:1}
+    // and direction +1, one valid BoundList is: (1, 2); (4, 6).  The same BoundList
+    // would be valid for index {i:-1} with direction -1.
+    typedef vector< pair< BSONObj, BSONObj > > BoundList;	
+
     // ranges of fields' value that may be determined from query -- used to
     // determine index limits
     class FieldRangeSet {