1 // Copyright (c) 2020-2021 Antony Polukhin
2 //
3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
5
6 #include <boost/core/lightweight_test.hpp>
7
8 #include <boost/pfr/core.hpp>
9
10 #include <chrono>
11
12 #include <optional>
13
14 // This class mimics libc++ implementation of std::chrono::duration with unfxed LWG3050
15 template <class Rep, class Period>
16 class bogus_duration {
17 public:
18 bogus_duration() = default;
19
20 template <class T>
bogus_duration(const T & val,typename std::enable_if<std::is_convertible<T,Rep>::value>::type * =nullptr)21 explicit bogus_duration(const T& val,
22 typename std::enable_if<
23 std::is_convertible<T, Rep>::value // <= libstdc++ fix for LWG3050 is 's/T/const T&/g'
24 >::type* = nullptr)
25 : rep_(val)
26 {}
27
28 template <class Rep2, class Period2>
bogus_duration(const bogus_duration<Rep2,Period2> & val,typename std::enable_if<std::is_convertible<Period2,Rep>::value>::type * =nullptr)29 bogus_duration(const bogus_duration<Rep2, Period2>& val,
30 typename std::enable_if<std::is_convertible<Period2, Rep>::value>::type* = nullptr)
31 : rep_(val)
32 {}
33
get_rep() const34 Rep get_rep() const { return rep_; }
35
36 private:
37 Rep rep_{0};
38 };
39
40 struct struct_with_bogus_duration {
41 std::optional<bogus_duration<long, char>> d0;
42 std::optional<bogus_duration<long, char>> d1;
43 };
44
45 struct struct_with_optional {
46 std::optional<std::chrono::seconds> a;
47 std::optional<std::chrono::milliseconds> b;
48 std::optional<std::chrono::microseconds> c;
49 std::optional<std::chrono::nanoseconds> d;
50 std::optional<std::chrono::steady_clock::duration> e;
51 std::optional<std::chrono::system_clock::duration> f;
52 };
53
main()54 int main() {
55 struct_with_optional val{
56 std::chrono::seconds{1},
57 std::chrono::seconds{2},
58 std::chrono::seconds{3},
59 std::chrono::seconds{4},
60 std::chrono::seconds{5},
61 std::chrono::seconds{6},
62 };
63
64 using boost::pfr::get;
65 BOOST_TEST(get<0>(val) == std::chrono::seconds{1});
66 BOOST_TEST(get<1>(val) == std::chrono::seconds{2});
67 BOOST_TEST(get<2>(val) == std::chrono::seconds{3});
68 BOOST_TEST(get<3>(val) == std::chrono::seconds{4});
69 BOOST_TEST(get<3>(val) > std::chrono::seconds{0});
70 BOOST_TEST(get<3>(val) > std::chrono::seconds{0});
71
72 struct_with_bogus_duration val2{bogus_duration<long, char>{1}, bogus_duration<long, char>{2}};
73 BOOST_TEST(get<0>(val2)->get_rep() == 1);
74 BOOST_TEST(get<1>(val2)->get_rep() == 2);
75
76 return boost::report_errors();
77 }
78
79