final/test/utilities/time/time.duration/time.duration.nonmember/op_-.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>

// duration

// template <class Rep1, class Period1, class Rep2, class Period2>
//   constexpr
//   typename common_type<duration<Rep1, Period1>, duration<Rep2, Period2>>::type
//   operator-(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);

#include <chrono>
#include <cassert>

int main()
{
    {
    std::chrono::seconds s1(3);
    std::chrono::seconds s2(5);
    std::chrono::seconds r = s1 - s2;
    assert(r.count() == -2);
    }
    {
    std::chrono::seconds s1(3);
    std::chrono::microseconds s2(5);
    std::chrono::microseconds r = s1 - s2;
    assert(r.count() == 2999995);
    }
    {
    std::chrono::duration<int, std::ratio<2, 3> > s1(3);
    std::chrono::duration<int, std::ratio<3, 5> > s2(5);
    std::chrono::duration<int, std::ratio<1, 15> > r = s1 - s2;
    assert(r.count() == -15);
    }
    {
    std::chrono::duration<int, std::ratio<2, 3> > s1(3);
    std::chrono::duration<double, std::ratio<3, 5> > s2(5);
    std::chrono::duration<double, std::ratio<1, 15> > r = s1 - s2;
    assert(r.count() == -15);
    }
#ifndef _LIBCPP_HAS_NO_CONSTEXPR
    {
    constexpr std::chrono::seconds s1(3);
    constexpr std::chrono::seconds s2(5);
    constexpr std::chrono::seconds r = s1 - s2;
    static_assert(r.count() == -2, "");
    }
    {
    constexpr std::chrono::seconds s1(3);
    constexpr std::chrono::microseconds s2(5);
    constexpr std::chrono::microseconds r = s1 - s2;
    static_assert(r.count() == 2999995, "");
    }
    {
    constexpr std::chrono::duration<int, std::ratio<2, 3> > s1(3);
    constexpr std::chrono::duration<int, std::ratio<3, 5> > s2(5);
    constexpr std::chrono::duration<int, std::ratio<1, 15> > r = s1 - s2;
    static_assert(r.count() == -15, "");
    }
    {
    constexpr std::chrono::duration<int, std::ratio<2, 3> > s1(3);
    constexpr std::chrono::duration<double, std::ratio<3, 5> > s2(5);
    constexpr std::chrono::duration<double, std::ratio<1, 15> > r = s1 - s2;
    static_assert(r.count() == -15, "");
    }
#endif
}