canvas/source/null/null_usagecounter.hxx

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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 */