1 //===----------------------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
12 // class year_month_day;
14 // constexpr year_month_day& operator+=(const months& m) noexcept;
15 // constexpr year_month_day& operator-=(const months& m) noexcept;
18 #include <type_traits>
21 #include "test_macros.h"
23 template <typename D, typename Ds>
24 constexpr bool testConstexpr(D d1)
26 if (static_cast<unsigned>((d1 ).month()) != 1) return false;
27 if (static_cast<unsigned>((d1 += Ds{ 1}).month()) != 2) return false;
28 if (static_cast<unsigned>((d1 += Ds{ 2}).month()) != 4) return false;
29 if (static_cast<unsigned>((d1 += Ds{12}).month()) != 4) return false;
30 if (static_cast<unsigned>((d1 -= Ds{ 1}).month()) != 3) return false;
31 if (static_cast<unsigned>((d1 -= Ds{ 2}).month()) != 1) return false;
32 if (static_cast<unsigned>((d1 -= Ds{12}).month()) != 1) return false;
38 using year = std::chrono::year;
39 using month = std::chrono::month;
40 using day = std::chrono::day;
41 using year_month_day = std::chrono::year_month_day;
42 using months = std::chrono::months;
44 ASSERT_NOEXCEPT(std::declval<year_month_day&>() += std::declval<months>());
45 ASSERT_NOEXCEPT(std::declval<year_month_day&>() -= std::declval<months>());
47 ASSERT_SAME_TYPE(year_month_day&, decltype(std::declval<year_month_day&>() += std::declval<months>()));
48 ASSERT_SAME_TYPE(year_month_day&, decltype(std::declval<year_month_day&>() -= std::declval<months>()));
50 static_assert(testConstexpr<year_month_day, months>(year_month_day{year{1234}, month{1}, day{1}}), "");
52 for (unsigned i = 0; i <= 10; ++i)
56 year_month_day ym(y, month{i}, d);
57 assert(static_cast<unsigned>((ym += months{2}).month()) == i + 2);
58 assert(ym.year() == y);
59 assert(ym.day() == d);
60 assert(static_cast<unsigned>((ym ).month()) == i + 2);
61 assert(ym.year() == y);
62 assert(ym.day() == d);
63 assert(static_cast<unsigned>((ym -= months{1}).month()) == i + 1);
64 assert(ym.year() == y);
65 assert(ym.day() == d);
66 assert(static_cast<unsigned>((ym ).month()) == i + 1);
67 assert(ym.year() == y);
68 assert(ym.day() == d);