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      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 chrono::weekday weekday() const noexcept;
     15 //  Returns: wdi_.weekday()
     16 
     17 #include <chrono>
     18 #include <type_traits>
     19 #include <cassert>
     20 
     21 #include "test_macros.h"
     22 
     23 int main()
     24 {
     25     using year                    = std::chrono::year;
     26     using month                   = std::chrono::month;
     27     using weekday                 = std::chrono::weekday;
     28     using weekday_last            = std::chrono::weekday_last;
     29     using year_month_weekday_last = std::chrono::year_month_weekday_last;
     30 
     31     ASSERT_NOEXCEPT(                   std::declval<const year_month_weekday_last>().weekday());
     32     ASSERT_SAME_TYPE(weekday, decltype(std::declval<const year_month_weekday_last>().weekday()));
     33 
     34     static_assert( year_month_weekday_last{year{}, month{}, weekday_last{weekday{}}}.weekday() == weekday{}, "");
     35 
     36     for (unsigned i = 1; i <= 50; ++i)
     37     {
     38         year_month_weekday_last ymwdl(year{1}, month{1}, weekday_last{weekday{i}});
     39         assert(static_cast<unsigned>(ymwdl.weekday()) == i);
     40     }
     41 }
     42