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21 
22 
23 
24 #ifndef _NULLCANVAS_USAGECOUNTER_HXX
25 #define _NULLCANVAS_USAGECOUNTER_HXX
26 
27 #include <osl/interlck.h>
28 #include <boost/current_function.hpp>
29 
30 namespace nullcanvas
31 {
32     /** Little resource tracking counter.
33 
34         When using this object, a global use counter, specific to the
35         given type is incremented on object construction, and
36         decremented on object destruction.
37      */
38     template< class Type > class UsageCounter
39     {
40     public:
UsageCounter()41         UsageCounter()
42         {
43             OSL_TRACE( "%s, %d objects currently in use.\n",
44                        BOOST_CURRENT_FUNCTION,
45                        osl_incrementInterlockedCount( &s_nCount ) );
46         }
47 
~UsageCounter()48         ~UsageCounter()
49         {
50             const sal_Int32 nCount( osl_decrementInterlockedCount( &s_nCount ) );
51 
52             if( !nCount )
53             {
54                 OSL_TRACE( "%s, last instance deleted.\n",
55                            BOOST_CURRENT_FUNCTION );
56             }
57             else
58             {
59                 OSL_TRACE( "%s, %d instances left.\n",
60                            BOOST_CURRENT_FUNCTION,
61                            nCount );
62             }
63         }
64 
65     private:
66         static oslInterlockedCount s_nCount;
67     };
68 
69     template< class Type > oslInterlockedCount UsageCounter<Type>::s_nCount = 0;
70 }
71 
72 #endif /* _NULLCANVAS_USAGECOUNTER_HXX */
73