/* * Copyright (C) 2010 Google Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef WebPrivatePtr_h #define WebPrivatePtr_h #if WEBKIT_IMPLEMENTATION #include <wtf/PassRefPtr.h> #endif namespace WebKit { // This class is an implementation detail of the WebKit API. It exists // to help simplify the implementation of WebKit interfaces that merely // wrap a reference counted WebCore class. template <typename T> class WebPrivatePtr { public: WebPrivatePtr() : m_ptr(0) { } ~WebPrivatePtr() { WEBKIT_ASSERT(!m_ptr); } bool isNull() const { return !m_ptr; } #if WEBKIT_IMPLEMENTATION WebPrivatePtr(const PassRefPtr<T>& prp) : m_ptr(prp.releaseRef()) { } void reset() { assign(0); } WebPrivatePtr<T>& operator=(const WebPrivatePtr<T>& other) { T* p = other.m_ptr; if (p) p->ref(); assign(p); return *this; } WebPrivatePtr<T>& operator=(const PassRefPtr<T>& prp) { assign(prp.releaseRef()); return *this; } T* get() const { return m_ptr; } T* operator->() const { ASSERT(m_ptr); return m_ptr; } #endif private: #if WEBKIT_IMPLEMENTATION void assign(T* p) { // p is already ref'd for us by the caller if (m_ptr) m_ptr->deref(); m_ptr = p; } #endif T* m_ptr; }; } // namespace WebKit #endif