From 0f2d33d4ee4291d61750769c2918263c7e485ffa Mon Sep 17 00:00:00 2001
From: kim <kim@3cdefd35-fc62-479d-8e8d-bae585ffb9ca>
Date: Wed, 11 Feb 2009 09:26:25 +0000
Subject: [PATCH] Fix a bug in TaggedFoll

git-svn-id: svn+ssh://idea.nguyen.vg/svn/sxsi/trunk/XMLTree@168 3cdefd35-fc62-479d-8e8d-bae585ffb9ca
---
 XMLTree.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/XMLTree.cpp b/XMLTree.cpp
index f155d3e..bb861a9 100644
--- a/XMLTree.cpp
+++ b/XMLTree.cpp
@@ -539,6 +539,9 @@ treeNode XMLTree::TaggedFoll(treeNode x, TagType tag)
     }
 
     int r, s;
+    if (x == Root() || (next_sibling(Par,x) == -1 ))
+      return NULLT;
+    
     r = (int) Tags->rank(tag, node2tagpos(next_sibling(Par, x))-1);
     s = (int) Tags->select(tag, r+1);  // select returns -1 in case that there is no r+1-th tag.
     if (s==-1) return NULLT;
-- 
2.17.1