xref: /aoo42x/main/canvas/inc/canvas/base/basemutexhelper.hxx (revision 91c99ff4)

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 * Licensed to the Apache Software Foundation (ASF) under one
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 * to you under the Apache License, Version 2.0 (the
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#ifndef INCLUDED_CANVAS_BASEMUTEXHELPER_HXX
#define INCLUDED_CANVAS_BASEMUTEXHELPER_HXX

#include <osl/mutex.hxx>


/* Definition of the BaseMutexHelper class */

namespace canvas
{
    /** Base class, deriving from ::comphelper::OBaseMutex and
        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.
     */
    template< class Base > class BaseMutexHelper : public Base
    {
    public:
        typedef Base BaseType;

        /** Construct BaseMutexHelper

        	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).
         */
        BaseMutexHelper() :
            BaseType( m_aMutex )
        {
        }

protected:
		mutable ::osl::Mutex m_aMutex;
    };
}

#endif /* INCLUDED_CANVAS_BASEMUTEXHELPER_HXX */