C++程序  |  26行  |  636 B

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <chrono>

// duration

// template <class Rep2, class Period2>
//   duration(const duration<Rep2, Period2>& d);

// inexact conversions disallowed for integral reps

#include <chrono>

int main()
{
    std::chrono::microseconds us(1);
    std::chrono::milliseconds ms = us;
}