103 lines
2.1 KiB
C++
103 lines
2.1 KiB
C++
/*
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* Copyright (C) 2003-2020 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#pragma once
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#include <wtf/Ref.h>
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namespace WTF {
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template <typename T>
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class DataRef {
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public:
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DataRef(Ref<T>&& data)
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: m_data(WTFMove(data))
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{
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}
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DataRef(const DataRef& other)
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: m_data(other.m_data.copyRef())
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{
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}
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DataRef& operator=(const DataRef& other)
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{
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m_data = other.m_data.copyRef();
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return *this;
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}
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DataRef(DataRef&&) = default;
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DataRef& operator=(DataRef&&) = default;
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DataRef replace(DataRef&& other)
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{
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return m_data.replace(WTFMove(other.m_data));
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}
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operator const T&() const
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{
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return m_data;
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}
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const T* ptr() const
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{
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return m_data.ptr();
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}
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const T& get() const
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{
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return m_data;
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}
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const T& operator*() const
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{
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return m_data;
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}
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const T* operator->() const
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{
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return m_data.ptr();
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}
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T& access()
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{
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if (!m_data->hasOneRef())
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m_data = m_data->copy();
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return m_data;
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}
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bool operator==(const DataRef& other) const
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{
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return m_data.ptr() == other.m_data.ptr() || m_data.get() == other.m_data.get();
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}
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bool operator!=(const DataRef& other) const
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{
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return !(*this == other);
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}
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private:
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Ref<T> m_data;
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};
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} // namespace WTF
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using WTF::DataRef;
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