include/salhelper/refobj.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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   9  * This file incorporates work covered by the following license notice:
  10  *
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  12  *   contributor license agreements. See the NOTICE file distributed
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  14  *   ownership. The ASF licenses this file to you under the Apache
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  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef _SALHELPER_REFOBJ_HXX_
  21 #define _SALHELPER_REFOBJ_HXX_
  22
  23 #include <sal/types.h>
  24 #include <rtl/alloc.h>
  25 #include <rtl/ref.hxx>
  26 #include <osl/diagnose.h>
  27 #include <osl/interlck.h>
  28
  29 namespace salhelper
  30 {
  31
  32 //----------------------------------------------------------------------------
  33
  34 class ReferenceObject : public rtl::IReference
  35 {
  36     /** Representation.
  37      */
  38     oslInterlockedCount m_nReferenceCount;
  39
  40     /** Not implemented.
  41      */
  42     ReferenceObject (const ReferenceObject&);
  43     ReferenceObject& operator= (const ReferenceObject&);
  44
  45 public:
  46     /** Allocation.
  47      */
  48     static void* operator new (size_t n) SAL_THROW(())
  49     {
  50         return ::rtl_allocateMemory (n);
  51     }
  52     static void operator delete (void* p) SAL_THROW(())
  53     {
  54         ::rtl_freeMemory (p);
  55     }
  56     static void* operator new (size_t, void* p) SAL_THROW(())
  57     {
  58         return (p);
  59     }
  60     static void operator delete (void*, void*) SAL_THROW(())
  61     {}
  62
  63 public:
  64     /** Construction.
  65      */
  66     inline ReferenceObject() SAL_THROW(()) : m_nReferenceCount (0)
  67     {}
  68
  69
  70     /** IReference.
  71      */
  72     virtual oslInterlockedCount SAL_CALL acquire() SAL_THROW(())
  73     {
  74         return ::osl_incrementInterlockedCount (&m_nReferenceCount);
  75     }
  76
  77     virtual oslInterlockedCount SAL_CALL release() SAL_THROW(())
  78     {
  79         oslInterlockedCount result;
  80         result = ::osl_decrementInterlockedCount (&m_nReferenceCount);
  81         if (result == 0)
  82         {
  83             // Last reference released.
  84             delete this;
  85         }
  86         return (result);
  87     }
  88
  89 protected:
  90     /** Destruction.
  91      */
  92     virtual ~ReferenceObject() SAL_THROW(())
  93     {
  94         OSL_ASSERT(m_nReferenceCount == 0);
  95     }
  96 };
  97
  98 //----------------------------------------------------------------------------
  99
 100 } // namespace salhelper
 101
 102 #endif /* !_SALHELPER_REFOBJ_HXX_ */
 103
 104 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */