/* -*- 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 <algorithm>
#include <vector>
namespace vcl
{
class DeletionListener;
class DeletionNotifier
{
std::vector< DeletionListener* > m_aListeners;
protected:
DeletionNotifier() {}
~DeletionNotifier()
{ notifyDelete(); }
inline void notifyDelete();
public:
void addDel( DeletionListener* pListener )
{ m_aListeners.push_back( pListener ); }
void removeDel( DeletionListener* pListener )
{ std::erase(m_aListeners, pListener); }
};
class DeletionListener
{
DeletionNotifier* m_pNotifier;
public:
DeletionListener( DeletionNotifier* pNotifier )
: m_pNotifier( pNotifier )
{
if( m_pNotifier )
m_pNotifier->addDel(
this );
}
DeletionListener(
const DeletionListener& rOther)
: m_pNotifier(rOther.m_pNotifier)
{
if (m_pNotifier)
m_pNotifier->addDel(
this);
}
~DeletionListener()
{
if( m_pNotifier )
m_pNotifier->removeDel(
this );
}
void deleted() { m_pNotifier = nullptr; }
bool isDeleted()
const {
return (m_pNotifier == nullptr); }
};
inline void DeletionNotifier::notifyDelete()
{
for(
auto& rListener : m_aListeners )
rListener->deleted();
m_aListeners.clear();
}
}
// namespace vcl
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