/* * Copyright (C) 2000 Lars Knoll (knoll@kde.org) * (C) 2000 Antti Koivisto (koivisto@kde.org) * (C) 2000 Dirk Mueller (mueller@kde.org) * Copyright (C) 2003, 2005, 2008 Apple Inc. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public License * along with this library; see the file COPYING.LIB. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301, USA. * */ #ifndef DataRef_h #define DataRef_h #include <wtf/PassRef.h> #include <wtf/Ref.h> namespace WebCore { template <typename T> class DataRef { public: DataRef(PassRef<T> data) : m_data(WTF::move(data)) { } DataRef(const DataRef& other) : m_data(const_cast<T&>(other.m_data.get())) { } DataRef& operator=(const DataRef& other) { m_data = const_cast<T&>(other.m_data.get()); return *this; } const T* get() const { return &m_data.get(); } const T& operator*() const { return *get(); } const T* operator->() const { return get(); } T* access() { if (!m_data->hasOneRef()) m_data = m_data->copy(); return &m_data.get(); } bool operator==(const DataRef<T>& o) const { return &m_data.get() == &o.m_data.get() || m_data.get() == o.m_data.get(); } bool operator!=(const DataRef<T>& o) const { return &m_data.get() != &o.m_data.get() && m_data.get() != o.m_data.get(); } private: Ref<T> m_data; }; } // namespace WebCore #endif // DataRef_h