canvas/source/null/null_usagecounter.hxx

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  30
  31 #ifndef _NULLCANVAS_USAGECOUNTER_HXX
  32 #define _NULLCANVAS_USAGECOUNTER_HXX
  33
  34 #include <osl/interlck.h>
  35 #include <boost/current_function.hpp>
  36
  37 namespace nullcanvas
  38 {
  39     /** Little resource tracking counter.
  40
  41         When using this object, a global use counter, specific to the
  42         given type is incremented on object construction, and
  43         decremented on object destruction.
  44      */
  45     template< class Type > class UsageCounter
  46     {
  47     public:
  48         UsageCounter()
  49         {
  50             OSL_TRACE( "%s, %d objects currently in use.\n",
  51                        BOOST_CURRENT_FUNCTION,
  52                        osl_incrementInterlockedCount( &s_nCount ) );
  53         }
  54
  55         ~UsageCounter()
  56         {
  57             const sal_Int32 nCount( osl_decrementInterlockedCount( &s_nCount ) );
  58
  59             if( !nCount )
  60             {
  61                 OSL_TRACE( "%s, last instance deleted.\n",
  62                            BOOST_CURRENT_FUNCTION );
  63             }
  64             else
  65             {
  66                 OSL_TRACE( "%s, %d instances left.\n",
  67                            BOOST_CURRENT_FUNCTION,
  68                            nCount );
  69             }
  70         }
  71
  72     private:
  73         static oslInterlockedCount s_nCount;
  74     };
  75
  76     template< class Type > oslInterlockedCount UsageCounter<Type>::s_nCount = 0;
  77 }
  78
  79 #endif /* _NULLCANVAS_USAGECOUNTER_HXX */