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ref_pair.hpp
1/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2/*************************************************************************
3 *
4 * Copyright (c) 2020 Kohei Yoshida
5 *
6 * Permission is hereby granted, free of charge, to any person
7 * obtaining a copy of this software and associated documentation
8 * files (the "Software"), to deal in the Software without
9 * restriction, including without limitation the rights to use,
10 * copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following
13 * conditions:
14 *
15 * The above copyright notice and this permission notice shall be
16 * included in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
20 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
22 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 ************************************************************************/
28
29#pragma once
30
31#include <type_traits>
32
33namespace mdds { namespace detail {
34
35template<typename T1, typename T2>
37{
38 using first_type = typename std::add_lvalue_reference<T1>::type;
39 using second_type = typename std::add_lvalue_reference<T2>::type;
40
41 first_type first;
42 second_type second;
43
44 ref_pair(first_type _first, second_type _second) : first(_first), second(_second)
45 {}
46
47 ref_pair(const ref_pair& other) = default;
48
49 bool operator==(const std::pair<typename std::decay<T1>::type, typename std::decay<T2>::type>& other) const
50 {
51 return first == other.first && second == other.second;
52 }
53
54 bool operator!=(const std::pair<typename std::decay<T1>::type, typename std::decay<T2>::type>& other) const
55 {
56 return !operator==(other);
57 }
58
59 bool operator==(const ref_pair& other) const
60 {
61 return first == other.first && second == other.second;
62 }
63
64 bool operator!=(const ref_pair& other) const
65 {
66 return !operator==(other);
67 }
68
69 ref_pair* operator->()
70 {
71 return this;
72 }
73};
74
75}} // namespace mdds::detail
76
77/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
Definition ref_pair.hpp:37