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 // duration
12 
13 // constexpr common_type_t<duration> operator+() const;
14 
15 #include <chrono>
16 #include <cassert>
17 #include <ratio>
18 #include <type_traits>
19 
20 #include "test_macros.h"
21 
22 int main(int, char**)
23 {
24     {
25     const std::chrono::minutes m(3);
26     std::chrono::minutes m2 = +m;
27     assert(m.count() == m2.count());
28     }
29 #if TEST_STD_VER >= 11
30     {
31     constexpr std::chrono::minutes m(3);
32     constexpr std::chrono::minutes m2 = +m;
33     static_assert(m.count() == m2.count(), "");
34     }
35 #endif
36 
37 // P0548
38     {
39     typedef std::chrono::duration<int, std::ratio<10,10> > D10;
40     typedef std::chrono::duration<int, std::ratio< 1, 1> > D1;
41     D10 zero(0);
42     D10 one(1);
43     static_assert( (std::is_same< decltype(+one), decltype(zero-one) >::value), "");
44     static_assert( (std::is_same< decltype(zero+one), D1>::value), "");
45     static_assert( (std::is_same< decltype(+one),     D1>::value), "");
46     }
47 
48   return 0;
49 }
50