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diff --git a/sw/inc/index.hxx b/sw/inc/index.hxx
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+++ b/sw/inc/index.hxx
@@ -0,0 +1,194 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef INCLUDED_SW_INC_INDEX_HXX
+#define INCLUDED_SW_INC_INDEX_HXX
+
+#include <sal/types.h>
+#include "swdllapi.h"
+
+#include <iostream>
+
+class SwIndexReg;
+struct SwPosition;
+
+namespace sw {
+namespace mark {
+class IMark;
+}
+}
+
+/// Marks a character position inside a document model node.
+class SAL_WARN_UNUSED SW_DLLPUBLIC SwIndex
+{
+private:
+    friend class SwIndexReg;
+
+    sal_Int32 m_nIndex;
+    SwIndexReg * m_pIndexReg;
+    // doubly linked list of Indexes registered at m_pIndexReg
+    SwIndex * m_pNext;
+    SwIndex * m_pPrev;
+
+    /// Pointer to a mark that owns this position to allow fast lookup of marks of an SwIndexReg.
+    const sw::mark::IMark* m_pMark;
+
+    SwIndex& ChgValue( const SwIndex& rIdx, sal_Int32 nNewValue );
+    void Init(sal_Int32 const nIdx);
+    void Remove();
+
+public:
+    explicit SwIndex(SwIndexReg *const pReg, sal_Int32 const nIdx = 0);
+    SwIndex( const SwIndex & );
+    SwIndex( const SwIndex &, short nDiff );
+    ~SwIndex() { Remove(); }
+
+    SwIndex& operator=( sal_Int32 const );
+    SwIndex& operator=( const SwIndex & );
+
+    sal_Int32 operator++();
+    sal_Int32 operator--();
+    sal_Int32 operator--(int);
+
+    sal_Int32 operator+=( sal_Int32 const );
+    sal_Int32 operator-=( sal_Int32 const );
+
+    bool operator< ( const SwIndex& ) const;
+    bool operator<=( const SwIndex& ) const;
+    bool operator> ( const SwIndex& ) const;
+    bool operator>=( const SwIndex& ) const;
+
+    bool operator< ( sal_Int32 const nVal ) const { return m_nIndex <  nVal; }
+    bool operator<=( sal_Int32 const nVal ) const { return m_nIndex <= nVal; }
+    bool operator> ( sal_Int32 const nVal ) const { return m_nIndex >  nVal; }
+    bool operator>=( sal_Int32 const nVal ) const { return m_nIndex >= nVal; }
+    bool operator==( sal_Int32 const nVal ) const { return m_nIndex == nVal; }
+    bool operator!=( sal_Int32 const nVal ) const { return m_nIndex != nVal; }
+
+    bool operator==( const SwIndex& rSwIndex ) const
+    {
+        return (m_nIndex    == rSwIndex.m_nIndex)
+            && (m_pIndexReg == rSwIndex.m_pIndexReg);
+    }
+
+    bool operator!=( const SwIndex& rSwIndex ) const
+    {
+        return (m_nIndex    != rSwIndex.m_nIndex)
+            || (m_pIndexReg != rSwIndex.m_pIndexReg);
+    }
+
+    sal_Int32 GetIndex() const { return m_nIndex; }
+
+    // Assignments without creating a temporary object.
+    SwIndex &Assign(SwIndexReg *, sal_Int32);
+
+    // Returns pointer to IndexArray (for RTTI at SwIndexReg).
+    const SwIndexReg* GetIdxReg() const { return m_pIndexReg; }
+    const SwIndex* GetNext() const { return m_pNext; }
+
+    const sw::mark::IMark* GetMark() const { return m_pMark; }
+    void SetMark(const sw::mark::IMark* pMark);
+};
+
+SW_DLLPUBLIC std::ostream& operator <<(std::ostream& s, const SwIndex& index);
+
+class SAL_WARN_UNUSED SwIndexReg
+{
+    friend class SwIndex;
+    friend bool sw_PosOk(const SwPosition & aPos);
+
+    const SwIndex * m_pFirst;
+    const SwIndex * m_pLast;
+
+protected:
+    virtual void Update( SwIndex const & rPos, const sal_Int32 nChangeLen,
+                 const bool bNegative = false, const bool bDelete = false );
+
+    bool HasAnyIndex() const { return nullptr != m_pFirst; }
+
+public:
+    SwIndexReg();
+    virtual ~SwIndexReg();
+
+    void MoveTo( SwIndexReg& rArr );
+    const SwIndex* GetFirstIndex() const { return m_pFirst; }
+};
+
+#ifndef DBG_UTIL
+
+inline sal_Int32 SwIndex::operator++()
+{
+    return ChgValue( *this, m_nIndex+1 ).m_nIndex;
+}
+
+inline sal_Int32 SwIndex::operator--()
+{
+    return ChgValue( *this, m_nIndex-1 ).m_nIndex;
+}
+
+inline sal_Int32 SwIndex::operator--(int)
+{
+    sal_Int32 const nOldIndex = m_nIndex;
+    ChgValue( *this, m_nIndex-1 );
+    return nOldIndex;
+}
+
+inline sal_Int32 SwIndex::operator+=( sal_Int32 const nVal )
+{
+    return ChgValue( *this, m_nIndex + nVal ).m_nIndex;
+}
+
+inline sal_Int32 SwIndex::operator-=( sal_Int32 const nVal )
+{
+    return ChgValue( *this, m_nIndex - nVal ).m_nIndex;
+}
+
+inline bool SwIndex::operator< ( const SwIndex& rIndex ) const
+{
+    return m_nIndex <  rIndex.m_nIndex;
+}
+
+inline bool SwIndex::operator<=( const SwIndex& rIndex ) const
+{
+    return m_nIndex <= rIndex.m_nIndex;
+}
+
+inline bool SwIndex::operator> ( const SwIndex& rIndex ) const
+{
+    return m_nIndex >  rIndex.m_nIndex;
+}
+
+inline bool SwIndex::operator>=( const SwIndex& rIndex ) const
+{
+    return m_nIndex >= rIndex.m_nIndex;
+}
+
+inline SwIndex& SwIndex::operator= ( sal_Int32 const nVal )
+{
+    if (m_nIndex != nVal)
+    {
+        ChgValue( *this, nVal );
+    }
+    return *this;
+}
+
+#endif // ifndef DBG_UTIL
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */