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diff --git a/include/com/sun/star/uno/Reference.h b/include/com/sun/star/uno/Reference.h
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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 .
+ */
+#ifndef INCLUDED_COM_SUN_STAR_UNO_REFERENCE_H
+#define INCLUDED_COM_SUN_STAR_UNO_REFERENCE_H
+
+#include "sal/config.h"
+
+#include <cassert>
+#include <cstddef>
+
+#if defined LIBO_INTERNAL_ONLY
+#include <type_traits>
+#endif
+
+#include "rtl/alloc.h"
+
+namespace com
+{
+namespace sun
+{
+namespace star
+{
+namespace uno
+{
+
+class RuntimeException;
+class XInterface;
+class Type;
+class Any;
+
+/** Enum defining UNO_REF_NO_ACQUIRE for setting reference without acquiring a given interface.
+    Deprecated, please use SAL_NO_ACQUIRE.
+    @deprecated
+*/
+enum UnoReference_NoAcquire
+{
+    /** This enum value can be used for creating a reference granting a given interface,
+        i.e. transferring ownership to it.
+    */
+    UNO_REF_NO_ACQUIRE
+};
+
+/** This base class serves as a base class for all template reference classes and
+    has been introduced due to compiler problems with templated operators ==, =!.
+*/
+class BaseReference
+{
+protected:
+    /** the interface pointer
+    */
+    XInterface * _pInterface;
+
+    /** Queries given interface for type rType.
+
+        @param pInterface interface pointer
+        @param rType interface type
+        @return interface of demanded type (may be null)
+    */
+    inline static XInterface * SAL_CALL iquery( XInterface * pInterface, const Type & rType );
+    /** Queries given interface for type rType.
+        Throws a RuntimeException if the demanded interface cannot be queried.
+
+        @param pInterface interface pointer
+        @param rType interface type
+        @return interface of demanded type
+    */
+    inline static XInterface * SAL_CALL iquery_throw( XInterface * pInterface, const Type & rType );
+
+public:
+    /** Gets interface pointer. This call does not acquire the interface.
+
+        @return UNacquired interface pointer
+    */
+    XInterface * SAL_CALL get() const
+        { return _pInterface; }
+
+    /** Checks if reference is null.
+
+        @return true if reference acquires an interface, i.e. true if it is not null
+    */
+    bool SAL_CALL is() const
+        { return (NULL != _pInterface); }
+
+#if defined LIBO_INTERNAL_ONLY
+    /** Checks if reference is null.
+
+        @return true if reference acquires an interface, i.e. true if it is not null
+    */
+    explicit operator bool() const
+        { return is(); }
+#endif
+
+    /** Equality operator: compares two interfaces
+        Checks if both references are null or refer to the same object.
+
+        @param pInterface another interface
+        @return true if both references are null or refer to the same object, false otherwise
+    */
+    inline bool SAL_CALL operator == ( XInterface * pInterface ) const;
+    /** Inequality operator: compares two interfaces
+        Checks if both references are null or refer to the same object.
+
+        @param pInterface another interface
+        @return false if both references are null or refer to the same object, true otherwise
+    */
+    inline bool SAL_CALL operator != ( XInterface * pInterface ) const;
+
+    /** Equality operator: compares two interfaces
+        Checks if both references are null or refer to the same object.
+
+        @param rRef another reference
+        @return true if both references are null or refer to the same object, false otherwise
+    */
+    inline bool SAL_CALL operator == ( const BaseReference & rRef ) const;
+    /** Inequality operator: compares two interfaces
+        Checks if both references are null or refer to the same object.
+
+        @param rRef another reference
+        @return false if both references are null or refer to the same object, true otherwise
+    */
+    inline bool SAL_CALL operator != ( const BaseReference & rRef ) const;
+
+    /** Needed by some STL containers.
+
+        @param rRef another reference
+        @return true, if this reference is less than rRef
+    */
+    inline bool SAL_CALL operator < ( const BaseReference & rRef ) const;
+};
+
+/** Enum defining UNO_QUERY for implicit interface query.
+*/
+enum UnoReference_Query
+{
+    /** This enum value can be used for implicit interface query.
+    */
+    UNO_QUERY
+};
+/** Enum defining UNO_QUERY_THROW for implicit interface query.
+    If the demanded interface is unavailable, then a RuntimeException is thrown.
+*/
+enum UnoReference_QueryThrow
+{
+    /** This enum value can be used for implicit interface query.
+    */
+    UNO_QUERY_THROW
+};
+/** Enum defining UNO_SET_THROW for throwing if attempts are made to assign a null
+    interface
+
+    @since UDK 3.2.8
+*/
+enum UnoReference_SetThrow
+{
+    UNO_SET_THROW
+};
+
+/** Template reference class for interface type derived from BaseReference.
+    A special constructor given the UNO_QUERY identifier queries interfaces
+    for reference type.
+*/
+template< class interface_type >
+class SAL_DLLPUBLIC_RTTI Reference : public BaseReference
+{
+    /** Queries given interface for type interface_type.
+
+        @param pInterface interface pointer
+        @return interface of demanded type (may be null)
+    */
+    inline static XInterface * SAL_CALL iquery( XInterface * pInterface );
+    /** Queries given interface for type interface_type.
+        Throws a RuntimeException if the demanded interface cannot be queried.
+
+        @param pInterface interface pointer
+        @return interface of demanded type
+    */
+    inline static XInterface * SAL_CALL iquery_throw( XInterface * pInterface );
+    /** Returns the given interface if it is not <NULL/>, throws a RuntimeException otherwise.
+
+        @param pInterface interface pointer
+        @return pInterface
+    */
+    inline static interface_type * SAL_CALL iset_throw( interface_type * pInterface );
+
+    /** Cast from an "interface pointer" (e.g., BaseReference::_pInterface) to a
+        pointer to this interface_type.
+
+        To work around ambiguities in the case of multiple-inheritance interface
+        types (which inherit XInterface more than once), use reinterpret_cast
+        (resp. a sequence of two static_casts, to avoid warnings about
+        reinterpret_cast used between related classes) to switch from a pointer
+        to XInterface to a pointer to this derived interface_type.  In
+        principle, this is not guaranteed to work.  In practice, it seems to
+        work on all supported platforms.
+    */
+    static interface_type * castFromXInterface(XInterface * p) {
+        return static_cast< interface_type * >(static_cast< void * >(p));
+    }
+
+    /** Cast from a pointer to this interface_type to an "interface pointer"
+        (e.g., BaseReference::_pInterface).
+
+        To work around ambiguities in the case of multiple-inheritance interface
+        types (which inherit XInterface more than once), use reinterpret_cast
+        (resp. a sequence of two static_casts, to avoid warnings about
+        reinterpret_cast used between related classes) to switch from a pointer
+        to this derived interface_type to a pointer to XInterface.  In
+        principle, this is not guaranteed to work.  In practice, it seems to
+        work on all supported platforms.
+    */
+    static XInterface * castToXInterface(interface_type * p) {
+        return static_cast< XInterface * >(static_cast< void * >(p));
+    }
+
+public:
+    /// @cond INTERNAL
+    // these are here to force memory de/allocation to sal lib.
+    static void * SAL_CALL operator new ( ::size_t nSize )
+        { return ::rtl_allocateMemory( nSize ); }
+    static void SAL_CALL operator delete ( void * pMem )
+        { ::rtl_freeMemory( pMem ); }
+    static void * SAL_CALL operator new ( ::size_t, void * pMem )
+        { return pMem; }
+    static void SAL_CALL operator delete ( void *, void * )
+        {}
+    /// @endcond
+
+    /** Destructor: Releases interface if set.
+    */
+    inline ~Reference() COVERITY_NOEXCEPT_FALSE;
+
+    /** Default Constructor: Sets null reference.
+    */
+    inline Reference();
+
+    /** Copy constructor: Copies interface reference.
+
+        @param rRef another reference
+    */
+    inline Reference( const Reference< interface_type > & rRef );
+
+#if defined LIBO_INTERNAL_ONLY
+    /** Move constructor
+
+        @param rRef another reference
+    */
+    inline Reference( Reference< interface_type > && rRef ) noexcept;
+
+    /** Up-casting conversion constructor: Copies interface reference.
+
+        Does not work for up-casts to ambiguous bases.  For the special case of
+        up-casting to Reference< XInterface >, see the corresponding conversion
+        operator.
+
+        @param rRef another reference
+    */
+    template< class derived_type >
+    inline Reference(
+        const Reference< derived_type > & rRef,
+        std::enable_if_t<
+            std::is_base_of_v<interface_type, derived_type>
+            && !std::is_same_v<interface_type, XInterface>, void *> = nullptr);
+#endif
+
+    /** Constructor: Sets given interface pointer.
+
+        @param pInterface an interface pointer
+    */
+    inline Reference( interface_type * pInterface );
+
+    /** Constructor: Sets given interface pointer without acquiring it.
+
+        @param pInterface another reference
+        @param dummy SAL_NO_ACQUIRE to force obvious distinction to other constructors
+    */
+    inline Reference( interface_type * pInterface, __sal_NoAcquire dummy);
+    /** Constructor: Sets given interface pointer without acquiring it.
+        Deprecated, please use SAL_NO_ACQUIRE version.
+
+        @deprecated
+        @param pInterface another reference
+        @param dummy UNO_REF_NO_ACQUIRE to force obvious distinction to other constructors
+    */
+    inline SAL_DEPRECATED("use SAL_NO_ACQUIRE version") Reference( interface_type * pInterface, UnoReference_NoAcquire dummy );
+
+    /** Constructor: Queries given interface for reference interface type (interface_type).
+
+        @param rRef another reference
+        @param dummy UNO_QUERY to force obvious distinction to other constructors
+    */
+    inline Reference( const BaseReference & rRef, UnoReference_Query dummy );
+    /** Constructor: Queries given interface for reference interface type (interface_type).
+
+        @param pInterface an interface pointer
+        @param dummy UNO_QUERY to force obvious distinction to other constructors
+    */
+    inline Reference( XInterface * pInterface, UnoReference_Query dummy);
+    /** Constructor: Queries given any for reference interface type (interface_type).
+
+        @param rAny an any
+        @param dummy UNO_QUERY to force obvious distinction to other constructors
+    */
+    inline Reference( const Any & rAny, UnoReference_Query dummy);
+    /** Constructor: Queries given interface for reference interface type (interface_type).
+        Throws a RuntimeException if the demanded interface cannot be queried.
+
+        @param rRef another reference
+        @param dummy UNO_QUERY_THROW to force obvious distinction
+                     to other constructors
+    */
+    inline Reference( const BaseReference & rRef, UnoReference_QueryThrow dummy );
+#ifdef LIBO_INTERNAL_ONLY
+    /**
+        Prevent code from calling the QUERY_THROW constructor, when they meant to use the SET_THROW constructor.
+    */
+    Reference( const Reference< interface_type > & rRef, UnoReference_QueryThrow dummy ) = delete;
+#endif
+    /** Constructor: Queries given interface for reference interface type (interface_type).
+        Throws a RuntimeException if the demanded interface cannot be queried.
+
+        @param pInterface an interface pointer
+        @param dummy UNO_QUERY_THROW to force obvious distinction
+                     to other constructors
+    */
+    inline Reference( XInterface * pInterface, UnoReference_QueryThrow dummy );
+    /** Constructor: Queries given any for reference interface type (interface_type).
+        Throws a RuntimeException if the demanded interface cannot be queried.
+
+        @param rAny an any
+        @param dummy UNO_QUERY_THROW to force obvious distinction
+                     to other constructors
+    */
+    inline Reference( const Any & rAny, UnoReference_QueryThrow dummy );
+    /** Constructor: assigns from the given interface of the same type. Throws a RuntimeException
+        if the source interface is NULL.
+
+        @param rRef another interface reference of the same type
+        @param dummy UNO_SET_THROW to distinguish from default copy constructor
+
+        @since UDK 3.2.8
+    */
+    inline Reference( const Reference< interface_type > & rRef, UnoReference_SetThrow dummy );
+    /** Constructor: assigns from the given interface of the same type. Throws a RuntimeException
+        if the source interface is NULL.
+
+        @param pInterface an interface pointer
+        @param dummy UNO_SET_THROW to distinguish from default assignment constructor
+
+        @since UDK 3.2.8
+    */
+    inline Reference( interface_type * pInterface, UnoReference_SetThrow dummy );
+
+    /** Cast operator to Reference< XInterface >: Reference objects are binary compatible and
+        any interface must be derived from com.sun.star.uno.XInterface.
+        This a useful direct cast possibility.
+    */
+    SAL_CALL operator const Reference< XInterface > & () const
+        { return * reinterpret_cast< const Reference< XInterface > * >( this ); }
+
+    /** Dereference operator: Used to call interface methods.
+
+        @return UNacquired interface pointer
+    */
+    interface_type * SAL_CALL operator -> () const {
+        assert(_pInterface != NULL);
+        return castFromXInterface(_pInterface);
+    }
+
+    /** Indirection operator.
+
+        @since LibreOffice 6.3
+        @return UNacquired interface reference
+    */
+    interface_type & SAL_CALL operator * () const {
+        assert(_pInterface != NULL);
+        return *castFromXInterface(_pInterface);
+    }
+
+    /** Gets interface pointer. This call does not acquire the interface.
+
+        @return UNacquired interface pointer
+    */
+    interface_type * SAL_CALL get() const
+        { return castFromXInterface(_pInterface); }
+
+    /** Clears reference, i.e. releases interface. Reference is null after clear() call.
+    */
+    inline void SAL_CALL clear();
+
+    /** Sets the given interface. An interface already set will be released.
+
+        @param rRef another reference
+        @return true, if non-null interface was set
+    */
+    inline bool SAL_CALL set( const Reference< interface_type > & rRef );
+    /** Sets the given interface. An interface already set will be released.
+
+        @param pInterface another interface
+        @return true, if non-null interface was set
+    */
+    inline bool SAL_CALL set( interface_type * pInterface );
+
+    /** Sets interface pointer without acquiring it. An interface already set will be released.
+
+        @param pInterface an interface pointer
+        @param dummy SAL_NO_ACQUIRE to force obvious distinction to set methods
+        @return true, if non-null interface was set
+    */
+    inline bool SAL_CALL set( interface_type * pInterface, __sal_NoAcquire dummy);
+    /** Sets interface pointer without acquiring it. An interface already set will be released.
+        Deprecated, please use SAL_NO_ACQUIRE version.
+
+        @deprecated
+        @param pInterface an interface pointer
+        @param dummy UNO_REF_NO_ACQUIRE to force obvious distinction to set methods
+        @return true, if non-null interface was set
+    */
+    inline SAL_DEPRECATED("use SAL_NO_ACQUIRE version") bool SAL_CALL set( interface_type * pInterface, UnoReference_NoAcquire dummy);
+
+    /** Queries given interface for reference interface type (interface_type) and sets it.
+        An interface already set will be released.
+
+        @param pInterface an interface pointer
+        @param dummy UNO_QUERY to force obvious distinction to set methods
+        @return true, if non-null interface was set
+    */
+    inline bool SAL_CALL set( XInterface * pInterface, UnoReference_Query dummy );
+    /** Queries given interface for reference interface type (interface_type) and sets it.
+        An interface already set will be released.
+
+        @param rRef another reference
+        @param dummy UNO_QUERY to force obvious distinction to set methods
+        @return true, if non-null interface was set
+    */
+    inline bool SAL_CALL set( const BaseReference & rRef, UnoReference_Query dummy);
+
+    /** Queries given any for reference interface type (interface_type)
+        and sets it.  An interface already set will be released.
+
+        @param rAny
+               an Any containing an interface
+        @param dummy
+               UNO_QUERY to force obvious distinction
+               to set methods
+        @return
+                true, if non-null interface was set
+    */
+    inline bool set( Any const & rAny, UnoReference_Query dummy );
+
+    /** Queries given interface for reference interface type (interface_type) and sets it.
+        An interface already set will be released.
+        Throws a RuntimeException if the demanded interface cannot be set.
+
+        @param pInterface an interface pointer
+        @param dummy UNO_QUERY_THROW to force obvious distinction
+                     to set methods
+    */
+    inline void SAL_CALL set( XInterface * pInterface, UnoReference_QueryThrow dummy );
+    /** Queries given interface for reference interface type (interface_type) and sets it.
+        An interface already set will be released.
+        Throws a RuntimeException if the demanded interface cannot be set.
+
+        @param rRef another reference
+        @param dummy UNO_QUERY_THROW to force obvious distinction
+               to set methods
+    */
+    inline void SAL_CALL set( const BaseReference & rRef, UnoReference_QueryThrow dummy );
+#ifdef LIBO_INTERNAL_ONLY
+    /**
+        Prevent code from calling the QUERY_THROW version, when they meant to use the SET_THROW version.
+    */
+    void set( const Reference< interface_type > & rRef, UnoReference_QueryThrow dummy ) = delete;
+#endif
+
+    /** Queries given any for reference interface type (interface_type) and
+        sets it.  An interface already set will be released.
+        Throws a RuntimeException if the demanded interface cannot be set.
+
+        @param rAny
+               an Any containing an interface
+        @param dummy
+               UNO_QUERY_THROW to force obvious distinction to set methods
+    */
+    inline void set( Any const & rAny, UnoReference_QueryThrow dummy);
+    /** sets the given interface
+        An interface already set will be released.
+        Throws a RuntimeException if the source interface is @b NULL.
+
+        @param pInterface an interface pointer
+        @param dummy UNO_SET_THROW to force obvious distinction to other set methods
+
+        @since UDK 3.2.8
+    */
+    inline void SAL_CALL set( interface_type * pInterface, UnoReference_SetThrow dummy);
+    /** sets the given interface
+        An interface already set will be released.
+        Throws a RuntimeException if the source interface is @b NULL.
+
+        @param rRef an interface reference
+        @param dummy UNO_SET_THROW to force obvious distinction to other set methods
+
+        @since UDK 3.2.8
+    */
+    inline void SAL_CALL set( const Reference< interface_type > & rRef, UnoReference_SetThrow dummy);
+
+
+    /** Assignment operator: Acquires given interface pointer and sets reference.
+        An interface already set will be released.
+
+        @param pInterface an interface pointer
+        @return this reference
+    */
+    inline Reference< interface_type > & SAL_CALL operator = ( interface_type * pInterface );
+    /** Assignment operator: Acquires given interface reference and sets reference.
+        An interface already set will be released.
+
+        @param rRef an interface reference
+        @return this reference
+    */
+    inline Reference< interface_type > & SAL_CALL operator = ( const Reference< interface_type > & rRef );
+#if defined LIBO_INTERNAL_ONLY
+    /** Assignment move operator: Acquires given interface reference and sets reference.
+        An interface already set will be released.
+
+        @param rRef an interface reference
+        @return this reference
+    */
+    inline Reference< interface_type > & SAL_CALL operator = ( Reference< interface_type > && rRef ) noexcept;
+#endif
+    /** Queries given interface reference for type interface_type.
+
+        @param rRef interface reference
+        @return interface reference of demanded type (may be null)
+    */
+    SAL_WARN_UNUSED_RESULT inline static Reference< interface_type > SAL_CALL query( const BaseReference & rRef );
+    /** Queries given interface for type interface_type.
+
+        @param pInterface interface pointer
+        @return interface reference of demanded type (may be null)
+    */
+    SAL_WARN_UNUSED_RESULT inline static Reference< interface_type > SAL_CALL query( XInterface * pInterface );
+};
+
+}
+}
+}
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */