final/test/utilities/time/time.point/time.point.nonmember/op_-duration.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     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>

// time_point

// template <class Clock, class Duration1, class Rep2, class Period2>
//   time_point<Clock, typename common_type<Duration1, duration<Rep2, Period2>>::type>
//   operator-(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs);

#include <chrono>
#include <cassert>

int main()
{
    typedef std::chrono::system_clock Clock;
    typedef std::chrono::milliseconds Duration1;
    typedef std::chrono::microseconds Duration2;
    std::chrono::time_point<Clock, Duration1> t1(Duration1(3));
    std::chrono::time_point<Clock, Duration2> t2 = t1 - Duration2(5);
    assert(t2.time_since_epoch() == Duration2(2995));
}