cppuhelper/inc/interfacecontainer4.hxx - core - Gitiles

 /* -*- 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/config.h>

 #include <com/sun/star/lang/EventObject.hpp>
 #include <com/sun/star/lang/DisposedException.hpp>
 #include <o3tl/cow_wrapper.hxx>
 #include <cassert>
 #include <mutex>
 #include <vector>

 namespace com::sun::star::uno
 {
 class XInterface;
 }

 /**
 This is a straight copy of the include/comphelper/interfacecontainer4.hxx file, copied here
 because it is nigh impossible to move shared code down into the URE layer.
 */

 namespace cppuhelper
 {
 template <class ListenerT> class OInterfaceContainerHelper4;
 /**
   This is the iterator of an OInterfaceContainerHelper4. Typically
   one constructs an instance on the stack for one firing session.
   It is not allowed to assign or copy an instance of this class.

   @tparam ListenerT UNO event listener type
   @see OInterfaceContainerHelper4
  */
 template <class ListenerT> class OInterfaceIteratorHelper4
 {
 public:
     /**
        Create an iterator over the elements of the container. The iterator
        copies the elements of the container. A change to the container
        during the lifetime of an iterator is allowed and does not
        affect the iterator-instance. The iterator and the container take cares
        themself for concurrent access, no additional guarding is necessary.

        Remark: The copy is on demand. The iterator copy the elements only if the container
        change the contents...

        @param rCont the container of the elements.
        @param rGuard
             this parameter only here to make that this container is accessed while locked
      */
     OInterfaceIteratorHelper4(std::unique_lock<std::mutex>& rGuard,
                               OInterfaceContainerHelper4<ListenerT>& rCont_)
         : m_rCont(rCont_)
         , m_aData(m_rCont.maData)
         // const_cast so we don't trigger make_unique via o3tl::cow_wrapper::operator->
         , m_nRemain(std::as_const(m_aData)->size())
     {
         assert(rGuard.owns_lock());
         (void)rGuard;
     }

     /** Return true, if there are more elements in the iterator. */
     bool hasMoreElements() const { return m_nRemain != 0; }
     /** Return the next element of the iterator. Calling this method if
         hasMoreElements() has returned false, is an error.
      */
     css::uno::Reference<ListenerT> const& next();

     /** Removes the current element (the last one returned by next())
         from the underlying container. Calling this method before
         next() has been called or calling it twice with no next()
         in between is an error.
         @param rGuard
             this parameter only here to make that this container is accessed while locked
     */
     void remove(::std::unique_lock<::std::mutex>& rGuard);

 private:
     OInterfaceContainerHelper4<ListenerT>& m_rCont;
     o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>,
                       o3tl::ThreadSafeRefCountingPolicy>
         m_aData;
     sal_Int32 m_nRemain;

     OInterfaceIteratorHelper4(const OInterfaceIteratorHelper4&) = delete;
     OInterfaceIteratorHelper4& operator=(const OInterfaceIteratorHelper4&) = delete;
 };

 template <class ListenerT>
 const css::uno::Reference<ListenerT>& OInterfaceIteratorHelper4<ListenerT>::next()
 {
     m_nRemain--;
     return (*std::as_const(m_aData))[m_nRemain];
 }

 template <class ListenerT>
 void OInterfaceIteratorHelper4<ListenerT>::remove(::std::unique_lock<::std::mutex>& rGuard)
 {
     m_rCont.removeInterface(rGuard, (*std::as_const(m_aData))[m_nRemain]);
 }

 /**
   A container of interfaces. To access the elements use an iterator.
   This implementation is thread-safe.

   This is a copy of the code at include/comphelper/interfacecontainer3.hxx,
   except that it (a) uses std::mutex instead of osl::Mutex and (b) does not
   store a reference to the mutex, but relies on the calling class to take
   a lock around using it.

   @tparam ListenerT UNO event listener type
   @see OInterfaceIteratorHelper
  */
 template <class ListenerT> class OInterfaceContainerHelper4
 {
 public:
     OInterfaceContainerHelper4();

     /**
       Return the number of Elements in the container. Only useful if you have acquired
       the mutex.
       @param rGuard
         this parameter only here to make that this container is accessed while locked
      */
     sal_Int32 getLength(std::unique_lock<std::mutex>& rGuard) const;

     /**
       Return all interfaces added to this container.
       @param rGuard
           this parameter only here to make that this container is accessed while locked
      **/
     std::vector<css::uno::Reference<ListenerT>>
     getElements(std::unique_lock<std::mutex>& rGuard) const;

     /** Inserts an element into the container.  The position is not specified, thus it is not
         specified in which order events are fired.

         @attention
         If you add the same interface more than once, then it will be added to the elements list
         more than once and thus if you want to remove that interface from the list, you have to call
         removeInterface() the same number of times.
         In the latter case, you will also get events fired more than once (if the interface is a
         listener interface).

         @param rxIFace
                interface to be added; it is allowed to insert
                the same interface more than once
         @param rGuard
             this parameter only here to make that this container is accessed while locked
         @return
                 the new count of elements in the container
     */
     sal_Int32 addInterface(std::unique_lock<std::mutex>& rGuard,
                            const css::uno::Reference<ListenerT>& rxIFace);
     /** Removes an element from the container.  It uses interface equality to remove the interface.

         @param rxIFace
                interface to be removed
         @param rGuard
                this parameter only here to make that this container is accessed while locked
         @return
                 the new count of elements in the container
     */
     sal_Int32 removeInterface(std::unique_lock<std::mutex>& rGuard,
                               const css::uno::Reference<ListenerT>& rxIFace);
     /**
       Call disposing on all object in the container that
       support XEventListener. Then clear the container.
       The guard is unlock()'ed before calling the listeners.
      */
     void disposeAndClear(::std::unique_lock<::std::mutex>& rGuard,
                          const css::lang::EventObject& rEvt);
     /**
       Clears the container without calling disposing().
         @param rGuard
             this parameter only here to make that this container is accessed while locked
      */
     void clear(::std::unique_lock<::std::mutex>& rGuard);

     /** Executes a functor for each contained listener of specified type, e.g.
         <code>forEach<awt::XPaintListener>(...</code>.

         If a css::lang::DisposedException occurs which relates to
         the called listener, then that listener is removed from the container.

         @tparam FuncT unary functor type, let your compiler deduce this for you
         @param func unary functor object expecting an argument of type
                     css::uno::Reference<ListenerT>
         @param rGuard
             this parameter only here to make that this container is accessed while locked
     */
     template <typename FuncT>
     inline void forEach(std::unique_lock<std::mutex>& rGuard, FuncT const& func) const;

     /** Calls a UNO listener method for each contained listener.

         The listener method must take a single argument of type EventT,
         and return <code>void</code>.

         If a css::lang::DisposedException occurs which relates to
         the called listener, then that listener is removed from the container.

         @tparam EventT event type, let your compiler deduce this for you
         @param NotificationMethod
             Pointer to a method of a ListenerT interface.
         @param Event
             Event to notify to all contained listeners
         @param rGuard
             this parameter only here to make that this container is accessed while locked

         Example:
 @code
     awt::PaintEvent aEvent( static_cast< cppu::OWeakObject* >( this ), ... );
     listeners.notifyEach( &XPaintListener::windowPaint, aEvent );
 @endcode
     */
     template <typename EventT>
     inline void notifyEach(std::unique_lock<std::mutex>& rGuard,
                            void (SAL_CALL ListenerT::*NotificationMethod)(const EventT&),
                            const EventT& Event) const;

     // this is moveable, but not copyable
     OInterfaceContainerHelper4(OInterfaceContainerHelper4&&) = default;
     OInterfaceContainerHelper4& operator=(OInterfaceContainerHelper4&&) = default;

 private:
     friend class OInterfaceIteratorHelper4<ListenerT>;
     o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>,
                       o3tl::ThreadSafeRefCountingPolicy>
         maData;
     OInterfaceContainerHelper4(const OInterfaceContainerHelper4&) = delete;
     OInterfaceContainerHelper4& operator=(const OInterfaceContainerHelper4&) = delete;

     static o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>,
                              o3tl::ThreadSafeRefCountingPolicy>&
     DEFAULT()
     {
         static o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>,
                                  o3tl::ThreadSafeRefCountingPolicy>
             SINGLETON;
         return SINGLETON;
     }

 private:
     template <typename EventT> class NotifySingleListener
     {
     private:
         typedef void (SAL_CALL ListenerT::*NotificationMethod)(const EventT&);
         NotificationMethod const m_pMethod;
         const EventT& m_rEvent;

     public:
         NotifySingleListener(NotificationMethod method, const EventT& event)
             : m_pMethod(method)
             , m_rEvent(event)
         {
             assert(m_pMethod);
         }

         void operator()(const css::uno::Reference<ListenerT>& listener) const
         {
             (listener.get()->*m_pMethod)(m_rEvent);
         }
     };
 };

 template <class T>
 inline OInterfaceContainerHelper4<T>::OInterfaceContainerHelper4()
     : maData(OInterfaceContainerHelper4<T>::DEFAULT())
 {
 }

 template <class T>
 template <typename FuncT>
 inline void OInterfaceContainerHelper4<T>::forEach(std::unique_lock<std::mutex>& rGuard,
                                                    FuncT const& func) const
 {
     assert(rGuard.owns_lock());
     if (std::as_const(maData)->size() == 0)
     {
         return;
     }
     const_cast<OInterfaceContainerHelper4&>(*this)
         .maData.make_unique(); // so we can iterate over the data without holding the lock
     OInterfaceIteratorHelper4<T> iter(rGuard, const_cast<OInterfaceContainerHelper4&>(*this));
     rGuard.unlock();
     while (iter.hasMoreElements())
     {
         auto xListener = iter.next();
         try
         {
             func(xListener);
         }
         catch (css::lang::DisposedException const& exc)
         {
             if (exc.Context == xListener)
             {
                 rGuard.lock();
                 iter.remove(rGuard);
                 rGuard.unlock();
             }
         }
     }
     rGuard.lock();
 }

 template <class ListenerT>
 template <typename EventT>
 inline void OInterfaceContainerHelper4<ListenerT>::notifyEach(
     std::unique_lock<std::mutex>& rGuard,
     void (SAL_CALL ListenerT::*NotificationMethod)(const EventT&), const EventT& Event) const
 {
     forEach<NotifySingleListener<EventT>>(rGuard,
                                           NotifySingleListener<EventT>(NotificationMethod, Event));
 }

 template <class ListenerT>
 sal_Int32
 OInterfaceContainerHelper4<ListenerT>::getLength(std::unique_lock<std::mutex>& rGuard) const
 {
     assert(rGuard.owns_lock());
     (void)rGuard;
     return maData->size();
 }

 template <class ListenerT>
 std::vector<css::uno::Reference<ListenerT>>
 OInterfaceContainerHelper4<ListenerT>::getElements(std::unique_lock<std::mutex>& rGuard) const
 {
     assert(rGuard.owns_lock());
     (void)rGuard;
     return *maData;
 }

 template <class ListenerT>
 sal_Int32
 OInterfaceContainerHelper4<ListenerT>::addInterface(std::unique_lock<std::mutex>& rGuard,
                                                     const css::uno::Reference<ListenerT>& rListener)
 {
     assert(rGuard.owns_lock());
     (void)rGuard;
     assert(rListener.is());
     maData->push_back(rListener);
     return std::as_const(maData)->size();
 }

 template <class ListenerT>
 sal_Int32 OInterfaceContainerHelper4<ListenerT>::removeInterface(
     std::unique_lock<std::mutex>& rGuard, const css::uno::Reference<ListenerT>& rListener)
 {
     assert(rGuard.owns_lock());
     (void)rGuard;
     assert(rListener.is());

     // It is not valid to compare the pointer directly, but it's faster.
     auto it = std::find_if(maData->begin(), maData->end(),
                            [&rListener](const css::uno::Reference<css::uno::XInterface>& rItem) {
                                return rItem.get() == rListener.get();
                            });

     // interface not found, use the correct compare method
     if (it == maData->end())
         it = std::find(maData->begin(), maData->end(), rListener);

     if (it != maData->end())
         maData->erase(it);

     return std::as_const(maData)->size();
 }

 template <class ListenerT>
 void OInterfaceContainerHelper4<ListenerT>::disposeAndClear(std::unique_lock<std::mutex>& rGuard,
                                                             const css::lang::EventObject& rEvt)
 {
     {
         OInterfaceIteratorHelper4<ListenerT> aIt(rGuard, *this);
         maData
             = DEFAULT(); // cheaper than calling maData->clear() because it doesn't allocate a new vector
         rGuard.unlock();
         // unlock followed by iterating is only safe because we are not going to call remove() on the iterator
         while (aIt.hasMoreElements())
         {
             try
             {
                 aIt.next()->disposing(rEvt);
             }
             catch (css::uno::RuntimeException&)
             {
                 // be robust, if e.g. a remote bridge has disposed already.
                 // there is no way to delegate the error to the caller :o(.
             }
         }
     }
     // tdf#152077 need to destruct the OInterfaceIteratorHelper4 before we take the lock again
     // because there is a vague chance that destructing it will trigger a call back into something
     // that wants to take the lock.
     rGuard.lock();
 }

 template <class ListenerT>
 void OInterfaceContainerHelper4<ListenerT>::clear(::std::unique_lock<::std::mutex>& rGuard)
 {
     assert(rGuard.owns_lock());
     (void)rGuard;
     maData->clear();
 }
 }

 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
	/* -- 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/config.h>

	#include <com/sun/star/lang/EventObject.hpp>
	#include <com/sun/star/lang/DisposedException.hpp>
	#include <o3tl/cow_wrapper.hxx>
	#include <cassert>
	#include <mutex>
	#include <vector>

	namespace com::sun::star::uno
	{
	class XInterface;
	}

	/**
	This is a straight copy of the include/comphelper/interfacecontainer4.hxx file, copied here
	because it is nigh impossible to move shared code down into the URE layer.
	*/

	namespace cppuhelper
	{
	template <class ListenerT> class OInterfaceContainerHelper4;
	/**
	This is the iterator of an OInterfaceContainerHelper4. Typically
	one constructs an instance on the stack for one firing session.
	It is not allowed to assign or copy an instance of this class.

	@tparam ListenerT UNO event listener type
	@see OInterfaceContainerHelper4
	*/
	template <class ListenerT> class OInterfaceIteratorHelper4
	{
	public:
	/**
	Create an iterator over the elements of the container. The iterator
	copies the elements of the container. A change to the container
	during the lifetime of an iterator is allowed and does not
	affect the iterator-instance. The iterator and the container take cares
	themself for concurrent access, no additional guarding is necessary.

	Remark: The copy is on demand. The iterator copy the elements only if the container
	change the contents...

	@param rCont the container of the elements.
	@param rGuard
	this parameter only here to make that this container is accessed while locked
	*/
	OInterfaceIteratorHelper4(std::unique_lock<std::mutex>& rGuard,
	OInterfaceContainerHelper4<ListenerT>& rCont_)
	: m_rCont(rCont_)
	, m_aData(m_rCont.maData)
	// const_cast so we don't trigger make_unique via o3tl::cow_wrapper::operator->
	, m_nRemain(std::as_const(m_aData)->size())
	{
	assert(rGuard.owns_lock());
	(void)rGuard;
	}

	/** Return true, if there are more elements in the iterator. */
	bool hasMoreElements() const { return m_nRemain != 0; }
	/** Return the next element of the iterator. Calling this method if
	hasMoreElements() has returned false, is an error.
	*/
	css::uno::Reference<ListenerT> const& next();

	/** Removes the current element (the last one returned by next())
	from the underlying container. Calling this method before
	next() has been called or calling it twice with no next()
	in between is an error.
	@param rGuard
	this parameter only here to make that this container is accessed while locked
	*/
	void remove(::std::unique_lock<::std::mutex>& rGuard);

	private:
	OInterfaceContainerHelper4<ListenerT>& m_rCont;
	o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>,
	o3tl::ThreadSafeRefCountingPolicy>
	m_aData;
	sal_Int32 m_nRemain;

	OInterfaceIteratorHelper4(const OInterfaceIteratorHelper4&) = delete;
	OInterfaceIteratorHelper4& operator=(const OInterfaceIteratorHelper4&) = delete;
	};

	template <class ListenerT>
	const css::uno::Reference<ListenerT>& OInterfaceIteratorHelper4<ListenerT>::next()
	{
	m_nRemain--;
	return (*std::as_const(m_aData))[m_nRemain];
	}

	template <class ListenerT>
	void OInterfaceIteratorHelper4<ListenerT>::remove(::std::unique_lock<::std::mutex>& rGuard)
	{
	m_rCont.removeInterface(rGuard, (*std::as_const(m_aData))[m_nRemain]);
	}

	/**
	A container of interfaces. To access the elements use an iterator.
	This implementation is thread-safe.

	This is a copy of the code at include/comphelper/interfacecontainer3.hxx,
	except that it (a) uses std::mutex instead of osl::Mutex and (b) does not
	store a reference to the mutex, but relies on the calling class to take
	a lock around using it.

	@tparam ListenerT UNO event listener type
	@see OInterfaceIteratorHelper
	*/
	template <class ListenerT> class OInterfaceContainerHelper4
	{
	public:
	OInterfaceContainerHelper4();

	/**
	Return the number of Elements in the container. Only useful if you have acquired
	the mutex.
	@param rGuard
	this parameter only here to make that this container is accessed while locked
	*/
	sal_Int32 getLength(std::unique_lock<std::mutex>& rGuard) const;

	/**
	Return all interfaces added to this container.
	@param rGuard
	this parameter only here to make that this container is accessed while locked
	**/
	std::vector<css::uno::Reference<ListenerT>>
	getElements(std::unique_lock<std::mutex>& rGuard) const;

	/** Inserts an element into the container. The position is not specified, thus it is not
	specified in which order events are fired.

	@attention
	If you add the same interface more than once, then it will be added to the elements list
	more than once and thus if you want to remove that interface from the list, you have to call
	removeInterface() the same number of times.
	In the latter case, you will also get events fired more than once (if the interface is a
	listener interface).

	@param rxIFace
	interface to be added; it is allowed to insert
	the same interface more than once
	@param rGuard
	this parameter only here to make that this container is accessed while locked
	@return
	the new count of elements in the container
	*/
	sal_Int32 addInterface(std::unique_lock<std::mutex>& rGuard,
	const css::uno::Reference<ListenerT>& rxIFace);
	/** Removes an element from the container. It uses interface equality to remove the interface.

	@param rxIFace
	interface to be removed
	@param rGuard
	this parameter only here to make that this container is accessed while locked
	@return
	the new count of elements in the container
	*/
	sal_Int32 removeInterface(std::unique_lock<std::mutex>& rGuard,
	const css::uno::Reference<ListenerT>& rxIFace);
	/**
	Call disposing on all object in the container that
	support XEventListener. Then clear the container.
	The guard is unlock()'ed before calling the listeners.
	*/
	void disposeAndClear(::std::unique_lock<::std::mutex>& rGuard,
	const css::lang::EventObject& rEvt);
	/**
	Clears the container without calling disposing().
	@param rGuard
	this parameter only here to make that this container is accessed while locked
	*/
	void clear(::std::unique_lock<::std::mutex>& rGuard);

	/** Executes a functor for each contained listener of specified type, e.g.
	<code>forEach<awt::XPaintListener>(...</code>.

	If a css::lang::DisposedException occurs which relates to
	the called listener, then that listener is removed from the container.

	@tparam FuncT unary functor type, let your compiler deduce this for you
	@param func unary functor object expecting an argument of type
	css::uno::Reference<ListenerT>
	@param rGuard
	this parameter only here to make that this container is accessed while locked
	*/
	template <typename FuncT>
	inline void forEach(std::unique_lock<std::mutex>& rGuard, FuncT const& func) const;

	/** Calls a UNO listener method for each contained listener.

	The listener method must take a single argument of type EventT,
	and return <code>void</code>.

	If a css::lang::DisposedException occurs which relates to
	the called listener, then that listener is removed from the container.

	@tparam EventT event type, let your compiler deduce this for you
	@param NotificationMethod
	Pointer to a method of a ListenerT interface.
	@param Event
	Event to notify to all contained listeners
	@param rGuard
	this parameter only here to make that this container is accessed while locked

	Example:
	@code
	awt::PaintEvent aEvent( static_cast< cppu::OWeakObject* >( this ), ... );
	listeners.notifyEach( &XPaintListener::windowPaint, aEvent );
	@endcode
	*/
	template <typename EventT>
	inline void notifyEach(std::unique_lock<std::mutex>& rGuard,
	void (SAL_CALL ListenerT::*NotificationMethod)(const EventT&),
	const EventT& Event) const;

	// this is moveable, but not copyable
	OInterfaceContainerHelper4(OInterfaceContainerHelper4&&) = default;
	OInterfaceContainerHelper4& operator=(OInterfaceContainerHelper4&&) = default;

	private:
	friend class OInterfaceIteratorHelper4<ListenerT>;
	o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>,
	o3tl::ThreadSafeRefCountingPolicy>
	maData;
	OInterfaceContainerHelper4(const OInterfaceContainerHelper4&) = delete;
	OInterfaceContainerHelper4& operator=(const OInterfaceContainerHelper4&) = delete;

	static o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>,
	o3tl::ThreadSafeRefCountingPolicy>&
	DEFAULT()
	{
	static o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>,
	o3tl::ThreadSafeRefCountingPolicy>
	SINGLETON;
	return SINGLETON;
	}

	private:
	template <typename EventT> class NotifySingleListener
	{
	private:
	typedef void (SAL_CALL ListenerT::*NotificationMethod)(const EventT&);
	NotificationMethod const m_pMethod;
	const EventT& m_rEvent;

	public:
	NotifySingleListener(NotificationMethod method, const EventT& event)
	: m_pMethod(method)
	, m_rEvent(event)
	{
	assert(m_pMethod);
	}

	void operator()(const css::uno::Reference<ListenerT>& listener) const
	{
	(listener.get()->*m_pMethod)(m_rEvent);
	}
	};
	};

	template <class T>
	inline OInterfaceContainerHelper4<T>::OInterfaceContainerHelper4()
	: maData(OInterfaceContainerHelper4<T>::DEFAULT())
	{
	}

	template <class T>
	template <typename FuncT>
	inline void OInterfaceContainerHelper4<T>::forEach(std::unique_lock<std::mutex>& rGuard,
	FuncT const& func) const
	{
	assert(rGuard.owns_lock());
	if (std::as_const(maData)->size() == 0)
	{
	return;
	}
	const_cast<OInterfaceContainerHelper4&>(*this)
	.maData.make_unique(); // so we can iterate over the data without holding the lock
	OInterfaceIteratorHelper4<T> iter(rGuard, const_cast<OInterfaceContainerHelper4&>(*this));
	rGuard.unlock();
	while (iter.hasMoreElements())
	{
	auto xListener = iter.next();
	try
	{
	func(xListener);
	}
	catch (css::lang::DisposedException const& exc)
	{
	if (exc.Context == xListener)
	{
	rGuard.lock();
	iter.remove(rGuard);
	rGuard.unlock();
	}
	}
	}
	rGuard.lock();
	}

	template <class ListenerT>
	template <typename EventT>
	inline void OInterfaceContainerHelper4<ListenerT>::notifyEach(
	std::unique_lock<std::mutex>& rGuard,
	void (SAL_CALL ListenerT::*NotificationMethod)(const EventT&), const EventT& Event) const
	{
	forEach<NotifySingleListener<EventT>>(rGuard,
	NotifySingleListener<EventT>(NotificationMethod, Event));
	}

	template <class ListenerT>
	sal_Int32
	OInterfaceContainerHelper4<ListenerT>::getLength(std::unique_lock<std::mutex>& rGuard) const
	{
	assert(rGuard.owns_lock());
	(void)rGuard;
	return maData->size();
	}

	template <class ListenerT>
	std::vector<css::uno::Reference<ListenerT>>
	OInterfaceContainerHelper4<ListenerT>::getElements(std::unique_lock<std::mutex>& rGuard) const
	{
	assert(rGuard.owns_lock());
	(void)rGuard;
	return *maData;
	}

	template <class ListenerT>
	sal_Int32
	OInterfaceContainerHelper4<ListenerT>::addInterface(std::unique_lock<std::mutex>& rGuard,
	const css::uno::Reference<ListenerT>& rListener)
	{
	assert(rGuard.owns_lock());
	(void)rGuard;
	assert(rListener.is());
	maData->push_back(rListener);
	return std::as_const(maData)->size();
	}

	template <class ListenerT>
	sal_Int32 OInterfaceContainerHelper4<ListenerT>::removeInterface(
	std::unique_lock<std::mutex>& rGuard, const css::uno::Reference<ListenerT>& rListener)
	{
	assert(rGuard.owns_lock());
	(void)rGuard;
	assert(rListener.is());

	// It is not valid to compare the pointer directly, but it's faster.
	auto it = std::find_if(maData->begin(), maData->end(),
	[&rListener](const css::uno::Reference<css::uno::XInterface>& rItem) {
	return rItem.get() == rListener.get();
	});

	// interface not found, use the correct compare method
	if (it == maData->end())
	it = std::find(maData->begin(), maData->end(), rListener);

	if (it != maData->end())
	maData->erase(it);

	return std::as_const(maData)->size();
	}

	template <class ListenerT>
	void OInterfaceContainerHelper4<ListenerT>::disposeAndClear(std::unique_lock<std::mutex>& rGuard,
	const css::lang::EventObject& rEvt)
	{
	{
	OInterfaceIteratorHelper4<ListenerT> aIt(rGuard, *this);
	maData
	= DEFAULT(); // cheaper than calling maData->clear() because it doesn't allocate a new vector
	rGuard.unlock();
	// unlock followed by iterating is only safe because we are not going to call remove() on the iterator
	while (aIt.hasMoreElements())
	{
	try
	{
	aIt.next()->disposing(rEvt);
	}
	catch (css::uno::RuntimeException&)
	{
	// be robust, if e.g. a remote bridge has disposed already.
	// there is no way to delegate the error to the caller :o(.
	}
	}
	}
	// tdf#152077 need to destruct the OInterfaceIteratorHelper4 before we take the lock again
	// because there is a vague chance that destructing it will trigger a call back into something
	// that wants to take the lock.
	rGuard.lock();
	}

	template <class ListenerT>
	void OInterfaceContainerHelper4<ListenerT>::clear(::std::unique_lock<::std::mutex>& rGuard)
	{
	assert(rGuard.owns_lock());
	(void)rGuard;
	maData->clear();
	}
	}

	/* vim:set shiftwidth=4 softtabstop=4 expandtab: */