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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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <com/sun/star/lang/EventObject.hpp>
+#include <osl/mutex.hxx>
+
+
+/* Definition of the DisambiguationHelper class */
+
+namespace canvas
+{
+ /** Base class, initializing its own baseclass with m_aMutex.
+
+ This is necessary to make the CanvasBase, GraphicDeviceBase,
+ etc. classes freely combinable - letting them perform this
+ initialization would prohibit deriving e.g. CanvasBase from
+ GraphicDeviceBase.
+
+ On top of that, disambiguates XEventListener::disposing and
+ WeakComponentImplHelper::disposing.
+
+ Having two virtual methods with the same name, and not
+ overriding them in every derived class, will hide one of
+ them. Later trying to override the same method, will generate
+ a new vtable slot, and lead to very hard to spot errors.
+ */
+ template< class Base > class DisambiguationHelper : public Base
+ {
+ protected:
+ /** Construct DisambiguationHelper
+
+ This method is the whole purpose of this template:
+ initializing a base class with the provided m_aMutex
+ member (the WeakComponentImplHelper templates need that,
+ as they require the lifetime of the mutex to extend
+ theirs).
+ */
+ DisambiguationHelper() :
+ Base( m_aMutex )
+ {
+ }
+
+ virtual void disposeThis()
+ {}
+ /// @throws css::uno::RuntimeException
+ virtual void disposeEventSource( const css::lang::EventObject& )
+ {}
+
+ mutable ::osl::Mutex m_aMutex;
+
+ private:
+ virtual void SAL_CALL disposing() override
+ { disposeThis(); }
+
+ virtual void SAL_CALL disposing( const css::lang::EventObject& Source ) override
+ { disposeEventSource(Source); }
+
+ };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */