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()18int 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