shell/inc/spsupp/COMRefCounted.hpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3 * This file is part of the LibreOffice project.
   4 *
   5 * This Source Code Form is subject to the terms of the Mozilla Public
   6 * License, v. 2.0. If a copy of the MPL was not distributed with this
   7 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8 */
   9
  10 #ifndef INCLUDED_SHELL_INC_SPSUPP_COMREFCOUNTED_HPP
  11 #define INCLUDED_SHELL_INC_SPSUPP_COMREFCOUNTED_HPP
  12
  13 #include <objbase.h>
  14 #include <assert.h>
  15
  16 template <class... Interfaces>
  17 class COMRefCounted : public Interfaces...
  18 {
  19 public:
  20     virtual ~COMRefCounted() {}
  21
  22     // IUnknown methods
  23
  24     ULONG STDMETHODCALLTYPE AddRef() override
  25     {
  26         return static_cast<ULONG>(::InterlockedIncrement(&m_nRef));
  27     }
  28
  29     ULONG STDMETHODCALLTYPE Release() override
  30     {
  31         assert(m_nRef > 0);
  32         if (::InterlockedDecrement(&m_nRef) == 0)
  33         {
  34             delete this;
  35             return 0;
  36         }
  37         return static_cast<ULONG>(m_nRef);
  38     }
  39
  40 private:
  41     LONG m_nRef = 1; // Created referenced
  42 };
  43
  44 #endif
  45
  46 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */