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diff --git a/src/md/hotdata/heapindex.h b/src/md/hotdata/heapindex.h
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+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+// 
+// File: HotHeapWriter.h
+// 
+
+// 
+// Class code:HeapIndex represents type of MetaData heap (#String, #GUID, #Blob, or #US).
+// 
+// ======================================================================================
+
+#pragma once
+
+namespace MetaData
+{
+
+// --------------------------------------------------------------------------------------
+// 
+// This class represents type of MetaData heap (#String, #GUID, #Blob, or #US).
+// 
+class HeapIndex
+{
+private:
+    UINT32 m_Index;
+public:
+    enum
+    {
+        StringHeapIndex     = 0, 
+        GuidHeapIndex       = 1, 
+        BlobHeapIndex       = 2, 
+        UserStringHeapIndex = 3, 
+        
+        CountHeapIndex, 
+        InvalidHeapIndex
+    };
+    HeapIndex()
+    {
+        m_Index = InvalidHeapIndex;
+    }
+    HeapIndex(UINT32 index)
+    {
+        _ASSERTE(IsValid(index));
+        m_Index = index;
+    }
+    void Set(UINT32 index)
+    {
+        _ASSERTE(IsValid(index));
+        m_Index = index;
+    }
+    void SetInvalid()
+    {
+        m_Index = InvalidHeapIndex;
+    }
+    BOOL IsValid() const
+    {
+        return m_Index < CountHeapIndex;
+    }
+    static BOOL IsValid(UINT32 index)
+    {
+        return index < CountHeapIndex;
+    }
+    UINT32 Get() const
+        { return m_Index; }
+    
+};  // class HeapIndex
+
+};  // namespace MetaData