1/*
2 * Copyright (C) 2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "CallbackID.h"
29#include <wtf/HashTraits.h>
30#include <wtf/RunLoop.h>
31
32namespace WebKit {
33
34class OptionalCallbackID {
35public:
36 explicit OptionalCallbackID() { }
37
38 ALWAYS_INLINE explicit OptionalCallbackID(const CallbackID& otherID)
39 : m_id(otherID.m_id)
40 {
41 }
42
43 ALWAYS_INLINE OptionalCallbackID(const OptionalCallbackID& otherID)
44 : m_id(otherID.m_id)
45 {
46 ASSERT(!HashTraits<uint64_t>::isDeletedValue(m_id));
47 }
48
49 ALWAYS_INLINE OptionalCallbackID& operator=(const OptionalCallbackID& otherID)
50 {
51 m_id = otherID.m_id;
52 return *this;
53 }
54
55 uint64_t toInteger() { return m_id; }
56 CallbackID callbackID()
57 {
58 RELEASE_ASSERT(CallbackID::isValidCallbackID(m_id));
59 return CallbackID(m_id);
60 }
61
62 operator bool() { return m_id; }
63
64 ALWAYS_INLINE bool isValid() const { return isValidCallbackID(m_id); }
65 static ALWAYS_INLINE bool isValidCallbackID(uint64_t rawId)
66 {
67 return !HashTraits<uint64_t>::isDeletedValue(rawId);
68 }
69
70 template<class Encoder> void encode(Encoder& encoder) const
71 {
72 RELEASE_ASSERT(isValid());
73 encoder << m_id;
74 }
75
76 template<class Decoder> static bool decode(Decoder& decoder, OptionalCallbackID& callbackID)
77 {
78 auto result = decoder.decode(callbackID.m_id);
79 RELEASE_ASSERT(callbackID.isValid());
80 return result;
81 }
82
83private:
84 uint64_t m_id { HashTraits<uint64_t>::emptyValue() };
85};
86
87}
88