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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;
     13 
     14 // constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const months& dm) noexcept;
     15 //   Returns: ymwd + (-dm).
     16 //
     17 // constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const years& dy) noexcept;
     18 //   Returns: ymwd + (-dy).
     19 
     20 
     21 #include <chrono>
     22 #include <type_traits>
     23 #include <cassert>
     24 
     25 #include "test_macros.h"
     26 
     27 #include <iostream>
     28 
     29 constexpr bool testConstexprYears ()
     30 {
     31     std::chrono::year_month_weekday ym0{std::chrono::year{1234}, std::chrono::January, std::chrono::weekday_indexed{std::chrono::Tuesday, 1}};
     32     std::chrono::year_month_weekday ym1 = ym0 - std::chrono::years{10};
     33     return
     34         ym1.year()    == std::chrono::year{1234-10}
     35      && ym1.month()   == std::chrono::January
     36      && ym1.weekday() == std::chrono::Tuesday
     37      && ym1.index()   == 1
     38         ;
     39 }
     40 
     41 constexpr bool testConstexprMonths ()
     42 {
     43     std::chrono::year_month_weekday ym0{std::chrono::year{1234}, std::chrono::November, std::chrono::weekday_indexed{std::chrono::Tuesday, 1}};
     44     std::chrono::year_month_weekday ym1 = ym0 - std::chrono::months{6};
     45     return
     46         ym1.year()    == std::chrono::year{1234}
     47      && ym1.month()   == std::chrono::May
     48      && ym1.weekday() == std::chrono::Tuesday
     49      && ym1.index()   == 1
     50         ;
     51 }
     52 
     53 
     54 int main()
     55 {
     56     using year               = std::chrono::year;
     57     using month              = std::chrono::month;
     58     using weekday            = std::chrono::weekday;
     59     using weekday_indexed    = std::chrono::weekday_indexed;
     60     using year_month_weekday = std::chrono::year_month_weekday;
     61     using years              = std::chrono::years;
     62     using months             = std::chrono::months;
     63 
     64     constexpr month November  = std::chrono::November;
     65     constexpr weekday Tuesday = std::chrono::Tuesday;
     66 
     67     {  // year_month_weekday - years
     68     ASSERT_NOEXCEPT(                              std::declval<year_month_weekday>() - std::declval<years>());
     69     ASSERT_SAME_TYPE(year_month_weekday, decltype(std::declval<year_month_weekday>() - std::declval<years>()));
     70 
     71     static_assert(testConstexprYears(), "");
     72 
     73     year_month_weekday ym{year{1234}, November, weekday_indexed{Tuesday, 1}};
     74     for (int i = 0; i <= 10; ++i)
     75     {
     76         year_month_weekday ym1 = ym - years{i};
     77         assert(static_cast<int>(ym1.year()) == 1234 - i);
     78         assert(ym1.month()   == November);
     79         assert(ym1.weekday() == Tuesday);
     80         assert(ym1.index()   == 1);
     81     }
     82     }
     83 
     84     {  // year_month_weekday - months
     85     ASSERT_NOEXCEPT(                              std::declval<year_month_weekday>() - std::declval<months>());
     86     ASSERT_SAME_TYPE(year_month_weekday, decltype(std::declval<year_month_weekday>() - std::declval<months>()));
     87 
     88     static_assert(testConstexprMonths(), "");
     89 
     90     year_month_weekday ym{year{1234}, November, weekday_indexed{Tuesday, 2}};
     91     for (unsigned i = 1; i <= 10; ++i)
     92     {
     93         year_month_weekday ym1 = ym - months{i};
     94         assert(ym1.year()    == year{1234});
     95         assert(ym1.month()   == month{11-i});
     96         assert(ym1.weekday() == Tuesday);
     97         assert(ym1.index()   == 2);
     98     }
     99     }
    100 }
    101