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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_CANVAS_BASE_DISAMBIGUATIONHELPER_HXX
#define INCLUDED_CANVAS_BASE_DISAMBIGUATIONHELPER_HXX
#include <osl/mutex.hxx>
/* Definition of the DisambiguationHelper class */
namespace canvas
{
/** Base class, initializing its own baseclass with m_aMutex.
This is necessary to make the CanvasBase, GraphicDeviceBase,
etc. classes freely combinable - letting them perform this
initialization would prohibit deriving e.g. CanvasBase from
GraphicDeviceBase.
On top of that, disambiguates XEventListener::disposing and
WeakComponentImplHelper::disposing.
Having two virtual methods with the same name, and not
overriding them in every derived class, will hide one of
them. Later trying to override the same method, will generate
a new vtable slot, and lead to very hard to spot errors.
*/
template< class Base > class DisambiguationHelper : public Base
{
public:
typedef Base BaseType;
/** Construct DisambiguationHelper
This method is the whole purpose of this template:
initializing a base class with the provided m_aMutex
member (the WeakComponentImplHelper templates need that,
as they require the lifetime of the mutex to extend
theirs).
*/
DisambiguationHelper() :
BaseType( m_aMutex )
{
}
virtual void SAL_CALL disposing()
{ disposeThis(); }
virtual void SAL_CALL disposing( const ::com::sun::star::lang::EventObject& Source ) throw (::com::sun::star::uno::RuntimeException)
{ disposeEventSource(Source); }
virtual void disposeThis()
{}
virtual void disposeEventSource( const ::com::sun::star::lang::EventObject& ) throw (::com::sun::star::uno::RuntimeException)
{}
protected:
mutable ::osl::Mutex m_aMutex;
};
}
#endif // INCLUDED_CANVAS_BASE_DISAMBIGUATIONHELPER_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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