1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#if defined(OPENTELEMETRY_STL_VERSION)
# if OPENTELEMETRY_STL_VERSION >= 2014
# include "opentelemetry/std/utility.h"
# define OPENTELEMETRY_HAVE_STD_UTILITY
# endif
#endif
#if !defined(OPENTELEMETRY_HAVE_STD_UTILITY)
# include <cstddef>
# include <initializer_list>
# include <type_traits>
# include "opentelemetry/nostd/detail/decay.h" // IWYU pragma: export
# include "opentelemetry/nostd/detail/invoke.h" // IWYU pragma: export
# include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace nostd
{
/**
* Back port of std::data
*
* See https://en.cppreference.com/w/cpp/iterator/data
*/
template <class C>
auto data(C &c) noexcept(noexcept(c.data())) -> decltype(c.data())
{
return c.data();
}
template <class C>
auto data(const C &c) noexcept(noexcept(c.data())) -> decltype(c.data())
{
return c.data();
}
template <class T, size_t N>
T *data(T (&array)[N]) noexcept
{
return array;
}
template <class E>
const E *data(std::initializer_list<E> list) noexcept
{
return list.begin();
}
/**
* Back port of std::size
*
* See https://en.cppreference.com/w/cpp/iterator/size
*/
template <class C>
auto size(const C &c) noexcept(noexcept(c.size())) -> decltype(c.size())
{
return c.size();
}
template <class T, size_t N>
size_t size(T (& /* array */)[N]) noexcept
{
return N;
}
/**
* Back port of std::bool_constant
*/
template <bool B>
using bool_constant = std::integral_constant<bool, B>;
/**
* Back port of std::integer_sequence
*/
template <typename T, T... Is>
struct integer_sequence
{
using value_type = T;
static constexpr std::size_t size() noexcept { return sizeof...(Is); }
};
/**
* Back port of std::index_sequence
*/
template <std::size_t... Is>
using index_sequence = integer_sequence<std::size_t, Is...>;
/**
* Back port of std::make_index_sequence
*/
namespace detail
{
template <class, size_t>
struct index_sequence_push_back
{};
template <size_t... Indexes, size_t I>
struct index_sequence_push_back<index_sequence<Indexes...>, I>
{
using type = index_sequence<Indexes..., I>;
};
template <class T, size_t I>
using index_sequence_push_back_t = typename index_sequence_push_back<T, I>::type;
template <size_t N>
struct make_index_sequence_impl
{
using type = index_sequence_push_back_t<typename make_index_sequence_impl<N - 1>::type, N - 1>;
};
template <>
struct make_index_sequence_impl<0>
{
using type = index_sequence<>;
};
} // namespace detail
template <size_t N>
using make_index_sequence = typename detail::make_index_sequence_impl<N>::type;
/**
* Back port of std::index_sequence_for
*/
template <class... Ts>
using index_sequence_for = make_index_sequence<sizeof...(Ts)>;
/**
* Back port of std::in_place_t
*/
struct in_place_t
{
explicit in_place_t() = default;
};
/**
* Back port of std::in_place_index_t
*/
template <std::size_t I>
struct in_place_index_t
{
explicit in_place_index_t() = default;
};
/**
* Back port of std::in_place_type_t
*/
template <typename T>
struct in_place_type_t
{
explicit in_place_type_t() = default;
};
} // namespace nostd
OPENTELEMETRY_END_NAMESPACE
#endif /* OPENTELEMETRY_HAVE_STD_UTILITY */
|
