15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright (C) 2000 Lars Knoll (knoll@kde.org) 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * (C) 2000 Antti Koivisto (koivisto@kde.org) 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * (C) 2000 Dirk Mueller (mueller@kde.org) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright (C) 2003, 2005, 2008 Apple Inc. All rights reserved. 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This library is free software; you can redistribute it and/or 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * modify it under the terms of the GNU Library General Public 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * License as published by the Free Software Foundation; either 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * version 2 of the License, or (at your option) any later version. 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This library is distributed in the hope that it will be useful, 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * but WITHOUT ANY WARRANTY; without even the implied warranty of 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Library General Public License for more details. 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * You should have received a copy of the GNU Library General Public License 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * along with this library; see the file COPYING.LIB. If not, write to 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Boston, MA 02110-1301, USA. 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef DataRef_h 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define DataRef_h 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "wtf/RefPtr.h" 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace blink { 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template <typename T> class DataRef { 32public: 33 const T* get() const { return m_data.get(); } 34 35 const T& operator*() const { return *get(); } 36 const T* operator->() const { return get(); } 37 38 T* access() 39 { 40 if (!m_data->hasOneRef()) 41 m_data = m_data->copy(); 42 return m_data.get(); 43 } 44 45 void init() 46 { 47 ASSERT(!m_data); 48 m_data = T::create(); 49 } 50 51 bool operator==(const DataRef<T>& o) const 52 { 53 ASSERT(m_data); 54 ASSERT(o.m_data); 55 return m_data == o.m_data || *m_data == *o.m_data; 56 } 57 58 bool operator!=(const DataRef<T>& o) const 59 { 60 ASSERT(m_data); 61 ASSERT(o.m_data); 62 return m_data != o.m_data && *m_data != *o.m_data; 63 } 64 65private: 66 RefPtr<T> m_data; 67}; 68 69} // namespace blink 70 71#endif // DataRef_h 72