| /* |
| * 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)); |
| } |
| |
| ALWAYS_INLINE OptionalCallbackID& operator=(const OptionalCallbackID& otherID) |
| { |
| m_id = otherID.m_id; |
| return *this; |
| } |
| |
| 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() }; |
| }; |
| |
| } |