/* * Copyright (C) 2017 Apple 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: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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. */ #pragma once #include "CallbackID.h" #include <wtf/HashTraits.h> #include <wtf/RunLoop.h> namespace WebKit { class OptionalCallbackID { public: explicit OptionalCallbackID() { } ALWAYS_INLINE explicit OptionalCallbackID(const CallbackID& otherID) : m_id(otherID.m_id) { } ALWAYS_INLINE OptionalCallbackID(const OptionalCallbackID& otherID) : m_id(otherID.m_id) { ASSERT(!HashTraits<uint64_t>::isDeletedValue(m_id)); } uint64_t toInteger() { return m_id; } CallbackID callbackID() { RELEASE_ASSERT(CallbackID::isValidCallbackID(m_id)); return CallbackID(m_id); } operator bool() { return m_id; } ALWAYS_INLINE bool isValid() const { return isValidCallbackID(m_id); } static ALWAYS_INLINE bool isValidCallbackID(uint64_t rawId) { return !HashTraits<uint64_t>::isDeletedValue(rawId); } template<class Encoder> void encode(Encoder& encoder) const { RELEASE_ASSERT(isValid()); encoder << m_id; } template<class Decoder> static bool decode(Decoder& decoder, OptionalCallbackID& callbackID) { auto result = decoder.decode(callbackID.m_id); RELEASE_ASSERT(callbackID.isValid()); return result; } private: uint64_t m_id { HashTraits<uint64_t>::emptyValue() }; }; }