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
|
// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef INCLUDED_SRC_UTILS_CPP_CONCEPTS_HPP
#define INCLUDED_SRC_UTILS_CPP_CONCEPTS_HPP
#include <chrono>
#include <string>
#include <type_traits>
// TODO(modernize): remove this once std::derived_from is shipped with libcxx
template <class T, class U>
concept derived_from = std::is_base_of_v<U, T>&&
std::is_convertible_v<const volatile T*, const volatile U*>;
// TODO(modernize): remove this once std::same_as is shipped with libcxx
template <class T, class U>
concept same_as = std::is_same_v<T, U>and std::is_same_v<U, T>;
template <class T>
concept ContainsString = requires {
typename T::value_type;
}
and std::is_same_v<typename T::value_type, std::string>;
template <class T>
concept HasSize = requires(T const c) {
{ c.size() }
->same_as<std::size_t>; // TODO(modernize): replace by std::same_as
};
template <typename T>
concept HasToString = requires(T const t) {
{ t.ToString() }
->same_as<std::string>; // TODO(modernize): replace by std::same_as
};
template <class T>
concept InputIterableContainer = requires(T const c) {
{ c.begin() }
->same_as<typename T::const_iterator>; // TODO(modernize): replace by
// std::input_iterator
{ c.end() }
->same_as<typename T::const_iterator>; // TODO(modernize): replace by
// std::input_iterator
};
template <class T>
concept OutputIterableContainer = InputIterableContainer<T>and requires(T c) {
{ std::inserter(c, c.begin()) }
->same_as<std::insert_iterator<T>>; // TODO(modernize): replace by
// std::output_iterator
};
template <class T>
concept InputIterableStringContainer =
InputIterableContainer<T>and ContainsString<T>;
// TODO(modernize): remove this once we require clang version >= 14.0.0
template <typename T>
concept ClockHasFromSys =
requires(std::chrono::time_point<std::chrono::system_clock> const tp) {
T::from_sys(tp);
};
// TODO(modernize): remove this once we require clang version >= 14.0.0
template <typename T>
concept ClockHasFromTime = requires(std::time_t const t) {
T::from_time_t(t);
};
template <typename T>
concept StrMapConstForwardIterator = requires(T const c) {
{
std::remove_reference_t<decltype((*c).first)> { (*c).first }
}
->same_as<std::string const>;
};
#endif // INCLUDED_SRC_UTILS_CPP_CONCEPTS_HPP
|
