libcxx/test/std/time/nanoseconds.pass.cpp

   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 // typedef duration<signed integral type of at least 64 bits, nano> nanoseconds;
  12
  13 #include <chrono>
  14 #include <limits>
  15 #include <ratio>
  16 #include <type_traits>
  17
  18 #include "test_macros.h"
  19
  20 int main(int, char**)
  21 {
  22     typedef std::chrono::nanoseconds D;
  23     typedef D::rep Rep;
  24     typedef D::period Period;
  25     static_assert(std::is_signed<Rep>::value, "");
  26     static_assert(std::is_integral<Rep>::value, "");
  27     static_assert(std::numeric_limits<Rep>::digits >= 63, "");
  28     static_assert((std::is_same<Period, std::nano>::value), "");
  29
  30   return 0;
  31 }