external/bsd/libc++/dist/libcxx/test/utilities/time/nanoseconds.pass.cpp

   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
  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 }