include/salhelper/refobj.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_SALHELPER_REFOBJ_HXX
  21 #define INCLUDED_SALHELPER_REFOBJ_HXX
  22
  23 #include <cassert>
  24
  25 #include "sal/types.h"
  26 #include "rtl/alloc.h"
  27 #include "osl/interlck.h"
  28
  29 namespace salhelper
  30 {
  31
  32 /** A base implementation for reference-counted objects.
  33
  34     @deprecated use salhelper::SimpleReferenceObject instead
  35 */
  36 class ReferenceObject
  37 {
  38     /** Representation.
  39      */
  40     oslInterlockedCount m_nReferenceCount;
  41
  42     ReferenceObject (const ReferenceObject&) SAL_DELETED_FUNCTION;
  43     ReferenceObject& operator= (const ReferenceObject&) SAL_DELETED_FUNCTION;
  44
  45 public:
  46     /** Allocation.
  47      */
  48     static void* operator new (size_t n)
  49     {
  50         return ::rtl_allocateMemory (n);
  51     }
  52     static void operator delete (void* p)
  53     {
  54         ::rtl_freeMemory (p);
  55     }
  56     static void* operator new (size_t, void* p)
  57     {
  58         return p;
  59     }
  60     static void operator delete (void*, void*)
  61     {}
  62
  63 public:
  64     /** Construction.
  65      */
  66     ReferenceObject() : m_nReferenceCount(0)
  67     {}
  68
  69
  70     void SAL_CALL acquire()
  71     {
  72         osl_atomic_increment(&m_nReferenceCount);
  73     }
  74
  75     void SAL_CALL release()
  76     {
  77         if (osl_atomic_decrement(&m_nReferenceCount) == 0)
  78         {
  79             // Last reference released.
  80             delete this;
  81         }
  82     }
  83
  84 protected:
  85     /** Destruction.
  86      */
  87     virtual ~ReferenceObject()
  88     {
  89         assert(m_nReferenceCount == 0);
  90     }
  91 };
  92
  93
  94 } // namespace salhelper
  95
  96 #endif /* ! INCLUDED_SALHELPER_REFOBJ_HXX */
  97
  98 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */