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27 
28 #ifndef _NULLCANVAS_USAGECOUNTER_HXX
29 #define _NULLCANVAS_USAGECOUNTER_HXX
30 
31 #include <osl/interlck.h>
32 #include <boost/current_function.hpp>
33 
34 namespace nullcanvas
35 {
36     /** Little resource tracking counter.
37 
38         When using this object, a global use counter, specific to the
39         given type is incremented on object construction, and
40         decremented on object destruction.
41      */
42     template< class Type > class UsageCounter
43     {
44     public:
45         UsageCounter()
46         {
47             OSL_TRACE( "%s, %d objects currently in use.\n",
48                        BOOST_CURRENT_FUNCTION,
49                        osl_incrementInterlockedCount( &s_nCount ) );
50         }
51 
52         ~UsageCounter()
53         {
54             const sal_Int32 nCount( osl_decrementInterlockedCount( &s_nCount ) );
55 
56             if( !nCount )
57             {
58                 OSL_TRACE( "%s, last instance deleted.\n",
59                            BOOST_CURRENT_FUNCTION );
60             }
61             else
62             {
63                 OSL_TRACE( "%s, %d instances left.\n",
64                            BOOST_CURRENT_FUNCTION,
65                            nCount );
66             }
67         }
68 
69     private:
70         static oslInterlockedCount s_nCount;
71     };
72 
73     template< class Type > oslInterlockedCount UsageCounter<Type>::s_nCount = 0;
74 }
75 
76 #endif /* _NULLCANVAS_USAGECOUNTER_HXX */
77