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21 
22 
23 
24 #ifndef INCLUDED_CANVAS_BASEMUTEXHELPER_HXX
25 #define INCLUDED_CANVAS_BASEMUTEXHELPER_HXX
26 
27 #include <osl/mutex.hxx>
28 
29 
30 /* Definition of the BaseMutexHelper class */
31 
32 namespace canvas
33 {
34     /** Base class, deriving from ::comphelper::OBaseMutex and
35         initializing its own baseclass with m_aMutex.
36 
37         This is necessary to make the CanvasBase, GraphicDeviceBase,
38         etc. classes freely combinable - letting them perform this
39         initialization would prohibit deriving e.g. CanvasBase from
40         GraphicDeviceBase.
41      */
42     template< class Base > class BaseMutexHelper : public Base
43     {
44     public:
45         typedef Base BaseType;
46 
47         /** Construct BaseMutexHelper
48 
49         	This method is the whole purpose of this template:
50         	initializing a base class with the provided m_aMutex
51         	member (the WeakComponentImplHelper templates need that,
52         	as they require the lifetime of the mutex to extend
53         	theirs).
54          */
BaseMutexHelper()55         BaseMutexHelper() :
56             BaseType( m_aMutex )
57         {
58         }
59 
60 protected:
61 		mutable ::osl::Mutex m_aMutex;
62     };
63 }
64 
65 #endif /* INCLUDED_CANVAS_BASEMUTEXHELPER_HXX */
66