From 1e23af2adc9f489bafcd09dfc97795b4f9d5bb6f Mon Sep 17 00:00:00 2001
From: tqchen <tianqi.tchen@gmail.com>
Date: Sat, 14 Mar 2015 00:20:37 -0700
Subject: [PATCH] add virtual destructor to iseekstream

---
 include/rabit/io.h        | 2 ++
 rabit-learn/io/hdfs-inl.h | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/rabit/io.h b/include/rabit/io.h
index 307f67f0f..eb1ca4414 100644
--- a/include/rabit/io.h
+++ b/include/rabit/io.h
@@ -19,6 +19,8 @@ namespace utils {
 /*! \brief interface of i/o stream that support seek */
 class ISeekStream: public IStream {
  public:
+  // virtual destructor
+  virtual ~ISeekStream(void) {}
   /*! \brief seek to certain position of the file */
   virtual void Seek(size_t pos) = 0;
   /*! \brief tell the position of the stream */
diff --git a/rabit-learn/io/hdfs-inl.h b/rabit-learn/io/hdfs-inl.h
index 526580020..7fcbec8d5 100644
--- a/rabit-learn/io/hdfs-inl.h
+++ b/rabit-learn/io/hdfs-inl.h
@@ -23,7 +23,7 @@ class HDFSStream : public utils::ISeekStream {
              bool disconnect_when_done)
       : fs_(fs), at_end_(false),
         disconnect_when_done_(disconnect_when_done) {
-    int flag;
+    int flag = 0;
     if (!strcmp(mode, "r")) {
       flag = O_RDONLY;
     } else if (!strcmp(mode, "w"))  {