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 <type_traits>
29
30namespace WTF {
31
32template<typename KeyTypeArg, typename ValueTypeArg>
33struct KeyValuePair {
34 WTF_MAKE_STRUCT_FAST_ALLOCATED;
35
36 using KeyType = KeyTypeArg;
37 using ValueType = ValueTypeArg;
38
39 KeyValuePair()
40 {
41 }
42
43 template<typename K, typename V>
44 KeyValuePair(K&& key, V&& value)
45 : key(std::forward<K>(key))
46 , value(std::forward<V>(value))
47 {
48 }
49
50 template <typename K, typename V>
51 KeyValuePair(KeyValuePair<K, V>&& other)
52 : key(std::forward<K>(other.key))
53 , value(std::forward<V>(other.value))
54 {
55 }
56
57 KeyType key;
58 ValueType value { };
59};
60
61template<typename K, typename V>
62inline KeyValuePair<typename std::decay<K>::type, typename std::decay<V>::type> makeKeyValuePair(K&& key, V&& value)
63{
64 return KeyValuePair<typename std::decay<K>::type, typename std::decay<V>::type> { std::forward<K>(key), std::forward<V>(value) };
65}
66
67}
68
69using WTF::KeyValuePair;
70