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     COMRefCounted() {}
  21     virtual ~COMRefCounted() {}
  22
  23     // IUnknown methods
  24
  25     ULONG STDMETHODCALLTYPE AddRef() override
  26     {
  27         return static_cast<ULONG>(::InterlockedIncrement(&m_nRef));
  28     }
  29
  30     ULONG STDMETHODCALLTYPE Release() override
  31     {
  32         assert(m_nRef > 0);
  33         if (::InterlockedDecrement(&m_nRef) == 0)
  34         {
  35             delete this;
  36             return 0;
  37         }
  38         return static_cast<ULONG>(m_nRef);
  39     }
  40
  41 private:
  42     long m_nRef = 1; // Created referenced
  43 };
  44
  45 #endif
  46
  47 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */