1 files changed, 67 insertions, 0 deletions
diff --git a/src/coreclr/md/hotdata/heapindex.h b/src/coreclr/md/hotdata/heapindex.h
new file mode 100644
index 00000000000..b257581ae77
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+++ b/src/coreclr/md/hotdata/heapindex.h
@@ -0,0 +1,67 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+//
+// 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