1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <chrono>
11 
12 // duration
13 
14 // static constexpr duration zero(); // noexcept after C++17
15 
16 #include <chrono>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 #include "../../rep.h"
21 
22 template <class D>
test()23 void test()
24 {
25     LIBCPP_ASSERT_NOEXCEPT(std::chrono::duration_values<typename D::rep>::zero());
26 #if TEST_STD_VER > 17
27     ASSERT_NOEXCEPT(       std::chrono::duration_values<typename D::rep>::zero());
28 #endif
29     {
30     typedef typename D::rep Rep;
31     Rep zero_rep = std::chrono::duration_values<Rep>::zero();
32     assert(D::zero().count() == zero_rep);
33     }
34 #if TEST_STD_VER >= 11
35     {
36     typedef typename D::rep Rep;
37     constexpr Rep zero_rep = std::chrono::duration_values<Rep>::zero();
38     static_assert(D::zero().count() == zero_rep, "");
39     }
40 #endif
41 }
42 
main()43 int main()
44 {
45     test<std::chrono::duration<int> >();
46     test<std::chrono::duration<Rep> >();
47 }
48