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// typedef duration<signed integral type of at least 23 bits, ratio<3600>> hours;
13
14#include <chrono>
15#include <type_traits>
16#include <limits>
17
18int main()
19{
20    typedef std::chrono::hours D;
21    typedef D::rep Rep;
22    typedef D::period Period;
23    static_assert(std::is_signed<Rep>::value, "");
24    static_assert(std::is_integral<Rep>::value, "");
25    static_assert(std::numeric_limits<Rep>::digits >= 22, "");
26    static_assert((std::is_same<Period, std::ratio<3600> >::value), "");
27}
28