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Diffstat (limited to 'include/unotools/weakref.hxx')
-rw-r--r-- | include/unotools/weakref.hxx | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/include/unotools/weakref.hxx b/include/unotools/weakref.hxx new file mode 100644 index 000000000..104737404 --- /dev/null +++ b/include/unotools/weakref.hxx @@ -0,0 +1,133 @@ +/* -*- 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 . + */ + +/* + * This file is part of LibreOffice published API. + */ +#pragma once + +#include <sal/config.h> + +#include <com/sun/star/uno/Reference.hxx> +#include <com/sun/star/uno/XInterface.hpp> +#include <cppuhelper/weakref.hxx> +#include <cppuhelper/weak.hxx> +#include <rtl/ref.hxx> + +namespace cppu +{ +class OWeakObject; +} + +namespace unotools +{ +/** The WeakReference<> holds a weak reference to an object. + + That object must implement the css::uno::XWeak interface. + + The WeakReference itself is *not* thread safe, just as + Reference itself isn't, but the implementation of the listeners etc. + behind it *is* thread-safe, so multiple threads can have their own + WeakReferences to the same XWeak object. + + @tparam interface_type type of interface +*/ +template <class interface_type> +class SAL_WARN_UNUSED WeakReference : public com::sun::star::uno::WeakReferenceHelper +{ +public: + /** Default ctor. Creates an empty weak reference. + */ + WeakReference() + : WeakReferenceHelper() + { + } + + /** Copy ctor. Initialize this reference with a hard reference. + + @param rRef another hard ref + */ + WeakReference(const rtl::Reference<interface_type>& rRef) + : WeakReferenceHelper(rRef) + { + } + + /** Copy ctor. Initialize this reference with a hard reference. + + @param rRef another hard ref + */ + WeakReference(interface_type& rRef) + : WeakReferenceHelper(&rRef) + { + } + + /** Copy ctor. Initialize this reference with a hard reference. + + @param rRef another hard ref + */ + WeakReference(interface_type* pRef) + : WeakReferenceHelper( + css::uno::Reference<css::uno::XWeak>(static_cast<cppu::OWeakObject*>(pRef))) + { + } + + /** Releases this reference and takes over hard reference xInt. + If the implementation behind xInt does not support XWeak + or XInt is null, then this reference is null. + + @param xInt another hard reference + */ + WeakReference& operator=(const rtl::Reference<interface_type>& xInt) + { + WeakReferenceHelper::operator=(xInt); + return *this; + } + + WeakReference& operator=(rtl::Reference<interface_type>&& xInt) + { + WeakReferenceHelper::operator=(std::move(xInt)); + return *this; + } + + WeakReference& operator=(interface_type* pInt) + { + WeakReferenceHelper::operator=( + css::uno::Reference<css::uno::XWeak>(static_cast<::cppu::OWeakObject*>(pInt))); + return *this; + } + + /** Gets a hard reference to the object. + + @return hard reference or null, if the weakly referenced interface has gone + */ + rtl::Reference<interface_type> SAL_CALL get() const + { + css::uno::Reference<css::uno::XInterface> xInterface = WeakReferenceHelper::get(); + return dynamic_cast<interface_type*>(xInterface.get()); + } + + /** Gets a hard reference to the object. + + @return hard reference or null, if the weakly referenced interface has gone + */ + operator ::rtl::Reference<interface_type>() const { return get(); } +}; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |