/src/mdds-3.1.0/include/mdds/ref_pair.hpp

Source
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
 *
 * Copyright (c) 2020 Kohei Yoshida
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 ************************************************************************/

#pragma once

#include <type_traits>

namespace mdds { namespace detail {

template<typename T1, typename T2>
struct ref_pair
{
    using first_type = typename std::add_lvalue_reference<T1>::type;
    using second_type = typename std::add_lvalue_reference<T2>::type;

    first_type first;
    second_type second;

    ref_pair(first_type _first, second_type _second) : first(_first), second(_second)
    {}

    ref_pair(const ref_pair& other) = default;

    bool operator==(const std::pair<typename std::decay<T1>::type, typename std::decay<T2>::type>& other) const
    {
        return first == other.first && second == other.second;
    }

    bool operator!=(const std::pair<typename std::decay<T1>::type, typename std::decay<T2>::type>& other) const
    {
        return !operator==(other);
    }

    bool operator==(const ref_pair& other) const
    {
        return first == other.first && second == other.second;
    }

    bool operator!=(const ref_pair& other) const
    {
        return !operator==(other);
    }

    ref_pair* operator->()
    {
        return this;
    }
};

}} // namespace mdds::detail

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

Line	Count	Source
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
33		namespace mdds { namespace detail {
34
35		template<typename T1, typename T2>
36		struct ref_pair
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	1.15k	ref_pair(first_type _first, second_type _second) : first(_first), second(_second)
45	1.15k	{}
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	1.15k	{
71	1.15k	return this;
72	1.15k	}
73		};
74
75		}} // namespace mdds::detail
76
77		/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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Created: 2026-06-13 06:44