1 files changed, 46 insertions, 0 deletions
diff --git a/shell/inc/spsupp/COMRefCounted.hpp b/shell/inc/spsupp/COMRefCounted.hpp
new file mode 100644
index 000000000..f8027321a
--- /dev/null
+++ b/shell/inc/spsupp/COMRefCounted.hpp
@@ -0,0 +1,46 @@
+/* -*- 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: */