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