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// constexpr duration& operator++();  // constexpr in c++17
15
16#include <chrono>
17#include <cassert>
18
19#include "test_macros.h"
20
21#if TEST_STD_VER > 14
22constexpr bool test_constexpr()
23{
24    std::chrono::hours h(3);
25    return (++h).count() == 4;
26}
27#endif
28
29int main()
30{
31    {
32    std::chrono::hours h(3);
33    std::chrono::hours& href = ++h;
34    assert(&href == &h);
35    assert(h.count() == 4);
36    }
37
38#if TEST_STD_VER > 14
39    static_assert(test_constexpr(), "");
40#endif
41}
42