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-rw-r--r--shell/inc/spsupp/COMRefCounted.hpp46
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diff --git a/shell/inc/spsupp/COMRefCounted.hpp b/shell/inc/spsupp/COMRefCounted.hpp
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+++ b/shell/inc/spsupp/COMRefCounted.hpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+* This file is part of the LibreOffice project.
+*
+* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#ifndef INCLUDED_SHELL_INC_SPSUPP_COMREFCOUNTED_HPP
+#define INCLUDED_SHELL_INC_SPSUPP_COMREFCOUNTED_HPP
+
+#include <objbase.h>
+#include <assert.h>
+
+template <class... Interfaces>
+class COMRefCounted : public Interfaces...
+{
+public:
+ virtual ~COMRefCounted() {}
+
+ // IUnknown methods
+
+ ULONG STDMETHODCALLTYPE AddRef() override
+ {
+ return static_cast<ULONG>(::InterlockedIncrement(&m_nRef));
+ }
+
+ ULONG STDMETHODCALLTYPE Release() override
+ {
+ assert(m_nRef > 0);
+ if (::InterlockedDecrement(&m_nRef) == 0)
+ {
+ delete this;
+ return 0;
+ }
+ return static_cast<ULONG>(m_nRef);
+ }
+
+private:
+ LONG m_nRef = 1; // Created referenced
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */