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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 64 bits, nano> nanoseconds;
13 
14 #include <chrono>
15 #include <type_traits>
16 #include <limits>
17 
main()18 int main()
19 {
20     typedef std::chrono::nanoseconds 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 >= 63, "");
26     static_assert((std::is_same<Period, std::nano>::value), "");
27 }
28