1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <chrono>
10
11// template <class Rep1, class Period1, class Rep2, class Period2>
12// struct common_type<chrono::duration<Rep1, Period1>, chrono::duration<Rep2, Period2>>
13// {
14// typedef chrono::duration<typename common_type<Rep1, Rep2>::type, see below }> type;
15// };
16
17#include <chrono>
18#include <ratio>
19#include <type_traits>
20
21#include "test_macros.h"
22
23template <class D1, class D2, class De>
24void
25test()
26{
27 typedef typename std::common_type<D1, D2>::type Dc;
28 static_assert((std::is_same<Dc, De>::value), "");
29}
30
31int main(int, char**)
32{
33 test<std::chrono::duration<int, std::ratio<1, 100> >,
34 std::chrono::duration<long, std::ratio<1, 1000> >,
35 std::chrono::duration<long, std::ratio<1, 1000> > >();
36 test<std::chrono::duration<long, std::ratio<1, 100> >,
37 std::chrono::duration<int, std::ratio<1, 1000> >,
38 std::chrono::duration<long, std::ratio<1, 1000> > >();
39 test<std::chrono::duration<char, std::ratio<1, 30> >,
40 std::chrono::duration<short, std::ratio<1, 1000> >,
41 std::chrono::duration<int, std::ratio<1, 3000> > >();
42 test<std::chrono::duration<double, std::ratio<21, 1> >,
43 std::chrono::duration<short, std::ratio<15, 1> >,
44 std::chrono::duration<double, std::ratio<3, 1> > >();
45
46 return 0;
47}
48

source code of libcxx/test/std/time/time.traits/time.traits.specializations/duration.pass.cpp