test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_year.pass.cpp

   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 // class year_month_weekday_last;
  13
  14 // constexpr year_month_weekday_last& operator+=(const years& d) noexcept;
  15 // constexpr year_month_weekday_last& operator-=(const years& d) noexcept;
  16
  17 #include <chrono>
  18 #include <type_traits>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22
  23 template <typename D, typename Ds>
  24 constexpr bool testConstexpr(D d1)
  25 {
  26     if (static_cast<int>((d1          ).year()) !=  1) return false;
  27     if (static_cast<int>((d1 += Ds{ 1}).year()) !=  2) return false;
  28     if (static_cast<int>((d1 += Ds{ 2}).year()) !=  4) return false;
  29     if (static_cast<int>((d1 += Ds{12}).year()) != 16) return false;
  30     if (static_cast<int>((d1 -= Ds{ 1}).year()) != 15) return false;
  31     if (static_cast<int>((d1 -= Ds{ 2}).year()) != 13) return false;
  32     if (static_cast<int>((d1 -= Ds{12}).year()) !=  1) return false;
  33     return true;
  34 }
  35
  36 int main()
  37 {
  38     using year                    = std::chrono::year;
  39     using month                   = std::chrono::month;
  40     using weekday                 = std::chrono::weekday;
  41     using weekday_last            = std::chrono::weekday_last;
  42     using year_month_weekday_last = std::chrono::year_month_weekday_last;
  43     using years                   = std::chrono::years;
  44
  45     ASSERT_NOEXCEPT(std::declval<year_month_weekday_last&>() += std::declval<years>());
  46     ASSERT_NOEXCEPT(std::declval<year_month_weekday_last&>() -= std::declval<years>());
  47
  48     ASSERT_SAME_TYPE(year_month_weekday_last&, decltype(std::declval<year_month_weekday_last&>() += std::declval<years>()));
  49     ASSERT_SAME_TYPE(year_month_weekday_last&, decltype(std::declval<year_month_weekday_last&>() -= std::declval<years>()));
  50
  51     constexpr weekday Tuesday = std::chrono::Tuesday;
  52     constexpr month January = std::chrono::January;
  53
  54     static_assert(testConstexpr<year_month_weekday_last, years>(year_month_weekday_last{year{1}, January, weekday_last{Tuesday}}), "");
  55
  56     for (int i = 1000; i <= 1010; ++i)
  57     {
  58         year_month_weekday_last ymwd(year{i}, January, weekday_last{Tuesday});
  59
  60         assert(static_cast<int>((ymwd += years{2}).year()) == i + 2);
  61         assert(ymwd.month()    == January);
  62         assert(ymwd.weekday()  == Tuesday);
  63
  64         assert(static_cast<int>((ymwd            ).year()) == i + 2);
  65         assert(ymwd.month()    == January);
  66         assert(ymwd.weekday()  == Tuesday);
  67
  68         assert(static_cast<int>((ymwd -= years{1}).year()) == i + 1);
  69         assert(ymwd.month()    == January);
  70         assert(ymwd.weekday()  == Tuesday);
  71
  72         assert(static_cast<int>((ymwd            ).year()) == i + 1);
  73         assert(ymwd.month()    == January);
  74         assert(ymwd.weekday()  == Tuesday);
  75     }
  76 }