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 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 10 11 // <chrono> 12 13 // using days = duration<signed integer type of at least 25 bits, ratio_multiply<ratio<24>, hours::period>>; 14 15 #include <chrono> 16 #include <type_traits> 17 #include <limits> 18 19 int main() 20 { 21 typedef std::chrono::days D; 22 typedef D::rep Rep; 23 typedef D::period Period; 24 static_assert(std::is_signed<Rep>::value, ""); 25 static_assert(std::is_integral<Rep>::value, ""); 26 static_assert(std::numeric_limits<Rep>::digits >= 25, ""); 27 static_assert(std::is_same_v<Period, std::ratio_multiply<std::ratio<24>, std::chrono::hours::period>>, ""); 28 } 29
