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27 
28 #ifndef INCLUDED_CANVAS_BASEMUTEXHELPER_HXX
29 #define INCLUDED_CANVAS_BASEMUTEXHELPER_HXX
30 
31 #include <osl/mutex.hxx>
32 
33 
34 /* Definition of the BaseMutexHelper class */
35 
36 namespace canvas
37 {
38     /** Base class, deriving from ::comphelper::OBaseMutex and
39         initializing its own baseclass with m_aMutex.
40 
41         This is necessary to make the CanvasBase, GraphicDeviceBase,
42         etc. classes freely combinable - letting them perform this
43         initialization would prohibit deriving e.g. CanvasBase from
44         GraphicDeviceBase.
45      */
46     template< class Base > class BaseMutexHelper : public Base
47     {
48     public:
49         typedef Base BaseType;
50 
51         /** Construct BaseMutexHelper
52 
53         	This method is the whole purpose of this template:
54         	initializing a base class with the provided m_aMutex
55         	member (the WeakComponentImplHelper templates need that,
56         	as they require the lifetime of the mutex to extend
57         	theirs).
58          */
59         BaseMutexHelper() :
60             BaseType( m_aMutex )
61         {
62         }
63 
64 protected:
65 		mutable ::osl::Mutex m_aMutex;
66     };
67 }
68 
69 #endif /* INCLUDED_CANVAS_BASEMUTEXHELPER_HXX */
70