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27*cdf0e10cSrcweir 
28*cdf0e10cSrcweir #ifndef _NULLCANVAS_USAGECOUNTER_HXX
29*cdf0e10cSrcweir #define _NULLCANVAS_USAGECOUNTER_HXX
30*cdf0e10cSrcweir 
31*cdf0e10cSrcweir #include <osl/interlck.h>
32*cdf0e10cSrcweir #include <boost/current_function.hpp>
33*cdf0e10cSrcweir 
34*cdf0e10cSrcweir namespace nullcanvas
35*cdf0e10cSrcweir {
36*cdf0e10cSrcweir     /** Little resource tracking counter.
37*cdf0e10cSrcweir 
38*cdf0e10cSrcweir         When using this object, a global use counter, specific to the
39*cdf0e10cSrcweir         given type is incremented on object construction, and
40*cdf0e10cSrcweir         decremented on object destruction.
41*cdf0e10cSrcweir      */
42*cdf0e10cSrcweir     template< class Type > class UsageCounter
43*cdf0e10cSrcweir     {
44*cdf0e10cSrcweir     public:
45*cdf0e10cSrcweir         UsageCounter()
46*cdf0e10cSrcweir         {
47*cdf0e10cSrcweir             OSL_TRACE( "%s, %d objects currently in use.\n",
48*cdf0e10cSrcweir                        BOOST_CURRENT_FUNCTION,
49*cdf0e10cSrcweir                        osl_incrementInterlockedCount( &s_nCount ) );
50*cdf0e10cSrcweir         }
51*cdf0e10cSrcweir 
52*cdf0e10cSrcweir         ~UsageCounter()
53*cdf0e10cSrcweir         {
54*cdf0e10cSrcweir             const sal_Int32 nCount( osl_decrementInterlockedCount( &s_nCount ) );
55*cdf0e10cSrcweir 
56*cdf0e10cSrcweir             if( !nCount )
57*cdf0e10cSrcweir             {
58*cdf0e10cSrcweir                 OSL_TRACE( "%s, last instance deleted.\n",
59*cdf0e10cSrcweir                            BOOST_CURRENT_FUNCTION );
60*cdf0e10cSrcweir             }
61*cdf0e10cSrcweir             else
62*cdf0e10cSrcweir             {
63*cdf0e10cSrcweir                 OSL_TRACE( "%s, %d instances left.\n",
64*cdf0e10cSrcweir                            BOOST_CURRENT_FUNCTION,
65*cdf0e10cSrcweir                            nCount );
66*cdf0e10cSrcweir             }
67*cdf0e10cSrcweir         }
68*cdf0e10cSrcweir 
69*cdf0e10cSrcweir     private:
70*cdf0e10cSrcweir         static oslInterlockedCount s_nCount;
71*cdf0e10cSrcweir     };
72*cdf0e10cSrcweir 
73*cdf0e10cSrcweir     template< class Type > oslInterlockedCount UsageCounter<Type>::s_nCount = 0;
74*cdf0e10cSrcweir }
75*cdf0e10cSrcweir 
76*cdf0e10cSrcweir #endif /* _NULLCANVAS_USAGECOUNTER_HXX */
77