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diff --git a/sw/inc/contentindex.hxx b/sw/inc/contentindex.hxx
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+++ b/sw/inc/contentindex.hxx
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+/* -*- 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 .
+ */
+#pragma once
+
+#include <sal/types.h>
+#include "swdllapi.h"
+
+#include <o3tl/typed_flags_set.hxx>
+
+#include <iostream>
+
+class SwContentNode;
+class SwContentIndexReg;
+struct SwPosition;
+class SwRangeRedline;
+
+namespace sw::mark { class IMark; }
+
+/// Marks a character position inside a document model content node (SwContentNode)
+class SAL_WARN_UNUSED SW_DLLPUBLIC SwContentIndex
+{
+private:
+    friend class SwContentIndexReg;
+
+    sal_Int32 m_nIndex;
+    SwContentNode * m_pContentNode;
+    // doubly linked list of Indexes registered at m_pIndexReg
+    SwContentIndex * m_pNext;
+    SwContentIndex * m_pPrev;
+
+    /// points to the SwRangeRedline (if any) that contains this SwIndex, via SwPosition and SwPaM
+    SwRangeRedline * m_pRangeRedline = nullptr;
+
+    /// Pointer to a mark that owns this position to allow fast lookup of marks of an SwContentIndexReg.
+    const sw::mark::IMark* m_pMark;
+
+    SwContentIndex& ChgValue( const SwContentIndex& rIdx, sal_Int32 nNewValue );
+    void Init(sal_Int32 const nIdx);
+    void Remove();
+
+public:
+    explicit SwContentIndex(const SwContentNode * pContentNode, sal_Int32 const nIdx = 0);
+    SwContentIndex( const SwContentIndex & );
+    SwContentIndex( const SwContentIndex &, short nDiff );
+    ~SwContentIndex() { Remove(); }
+
+    SwContentIndex& operator=( sal_Int32 const );
+    SwContentIndex& operator=( const SwContentIndex & );
+
+    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 SwContentIndex& ) const;
+    bool operator<=( const SwContentIndex& ) const;
+    bool operator> ( const SwContentIndex& ) const;
+    bool operator>=( const SwContentIndex& ) 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 SwContentIndex& rSwContentIndex ) const
+    {
+        return (m_nIndex    == rSwContentIndex.m_nIndex)
+            && (m_pContentNode == rSwContentIndex.m_pContentNode);
+    }
+
+    bool operator!=( const SwContentIndex& rSwContentIndex ) const
+    {
+        return (m_nIndex    != rSwContentIndex.m_nIndex)
+            || (m_pContentNode != rSwContentIndex.m_pContentNode);
+    }
+
+    sal_Int32 GetIndex() const { return m_nIndex; }
+
+    // Assignments without creating a temporary object.
+    SwContentIndex &Assign(const SwContentNode *, sal_Int32);
+
+    // Returns pointer to SwContentNode (for RTTI at SwContentIndexReg).
+    const SwContentNode* GetContentNode() const { return m_pContentNode; }
+    const SwContentIndex* GetNext() const { return m_pNext; }
+
+    const sw::mark::IMark* GetMark() const { return m_pMark; }
+    void SetMark(const sw::mark::IMark* pMark);
+
+    SwRangeRedline* GetRedline() const { return m_pRangeRedline; }
+    void SetRedline(SwRangeRedline* pRangeRedline) { m_pRangeRedline = pRangeRedline; }
+};
+
+SW_DLLPUBLIC std::ostream& operator <<(std::ostream& s, const SwContentIndex& index);
+
+/// Helper base class for SwContentNode to manage the list of attached SwContentIndex
+class SAL_WARN_UNUSED SAL_LOPLUGIN_ANNOTATE("crosscast") SwContentIndexReg
+{
+    friend class SwContentIndex;
+
+    const SwContentIndex * m_pFirst;
+    const SwContentIndex * m_pLast;
+
+public:
+    enum class UpdateMode {
+        Default = 0,
+        Negative = (1<<0),
+        Delete = (1<<1),
+        Replace = (1<<2),
+    };
+
+protected:
+    virtual void Update( SwContentIndex const & rPos, const sal_Int32 nChangeLen,
+            UpdateMode eMode);
+
+    bool HasAnyIndex() const { return nullptr != m_pFirst; }
+
+    SwContentIndexReg();
+public:
+    virtual ~SwContentIndexReg();
+
+    void MoveTo( SwContentNode& rArr );
+    const SwContentIndex* GetFirstIndex() const { return m_pFirst; }
+};
+
+namespace o3tl
+{
+    template<> struct typed_flags<SwContentIndexReg::UpdateMode> : is_typed_flags<SwContentIndexReg::UpdateMode, 0x07> {};
+}
+
+#ifndef DBG_UTIL
+
+inline sal_Int32 SwContentIndex::operator++()
+{
+    return ChgValue( *this, m_nIndex+1 ).m_nIndex;
+}
+
+inline sal_Int32 SwContentIndex::operator--()
+{
+    return ChgValue( *this, m_nIndex-1 ).m_nIndex;
+}
+
+inline sal_Int32 SwContentIndex::operator--(int)
+{
+    sal_Int32 const nOldIndex = m_nIndex;
+    ChgValue( *this, m_nIndex-1 );
+    return nOldIndex;
+}
+
+inline sal_Int32 SwContentIndex::operator+=( sal_Int32 const nVal )
+{
+    return ChgValue( *this, m_nIndex + nVal ).m_nIndex;
+}
+
+inline sal_Int32 SwContentIndex::operator-=( sal_Int32 const nVal )
+{
+    return ChgValue( *this, m_nIndex - nVal ).m_nIndex;
+}
+
+inline bool SwContentIndex::operator< ( const SwContentIndex& rIndex ) const
+{
+    return m_nIndex <  rIndex.m_nIndex;
+}
+
+inline bool SwContentIndex::operator<=( const SwContentIndex& rIndex ) const
+{
+    return m_nIndex <= rIndex.m_nIndex;
+}
+
+inline bool SwContentIndex::operator> ( const SwContentIndex& rIndex ) const
+{
+    return m_nIndex >  rIndex.m_nIndex;
+}
+
+inline bool SwContentIndex::operator>=( const SwContentIndex& rIndex ) const
+{
+    return m_nIndex >= rIndex.m_nIndex;
+}
+
+inline SwContentIndex& SwContentIndex::operator= ( sal_Int32 const nVal )
+{
+    if (m_nIndex != nVal)
+    {
+        ChgValue( *this, nVal );
+    }
+    return *this;
+}
+
+#endif // ifndef DBG_UTIL
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */