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// static constexpr duration zero(); // noexcept after C++17
14
15#include <chrono>
16#include <cassert>
17
18#include "test_macros.h"
19#include "../../rep.h"
20
21template <class D>
22void test()
23{
24 LIBCPP_ASSERT_NOEXCEPT(std::chrono::duration_values<typename D::rep>::zero());
25#if TEST_STD_VER > 17
26 ASSERT_NOEXCEPT( std::chrono::duration_values<typename D::rep>::zero());
27#endif
28 {
29 typedef typename D::rep DRep;
30 DRep zero_rep = std::chrono::duration_values<DRep>::zero();
31 assert(D::zero().count() == zero_rep);
32 }
33#if TEST_STD_VER >= 11
34 {
35 typedef typename D::rep DRep;
36 constexpr DRep zero_rep = std::chrono::duration_values<DRep>::zero();
37 static_assert(D::zero().count() == zero_rep, "");
38 }
39#endif
40}
41
42int main(int, char**)
43{
44 test<std::chrono::duration<int> >();
45 test<std::chrono::duration<Rep> >();
46
47 return 0;
48}
49

source code of libcxx/test/std/time/time.duration/time.duration.special/zero.pass.cpp