op_sys_days.pass.cpp (2503B)
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 operator sys_days() const noexcept; 15 // Returns: If ok() == true, returns a sys_days that represents the last weekday() 16 // of year()/month(). Otherwise the returned value is unspecified. 17 18 #include <chrono> 19 #include <type_traits> 20 #include <cassert> 21 22 #include "test_macros.h" 23 24 #include <iostream> 25 26 int main() 27 { 28 using year = std::chrono::year; 29 using month = std::chrono::month; 30 using year_month_weekday_last = std::chrono::year_month_weekday_last; 31 using sys_days = std::chrono::sys_days; 32 using days = std::chrono::days; 33 using weekday = std::chrono::weekday; 34 using weekday_last = std::chrono::weekday_last; 35 36 ASSERT_NOEXCEPT( static_cast<sys_days>(std::declval<const year_month_weekday_last>())); 37 ASSERT_SAME_TYPE(sys_days, decltype(static_cast<sys_days>(std::declval<const year_month_weekday_last>()))); 38 39 constexpr month January = std::chrono::January; 40 constexpr weekday Tuesday = std::chrono::Tuesday; 41 42 { // Last Tuesday in Jan 1970 was the 27th 43 constexpr year_month_weekday_last ymwdl{year{1970}, January, weekday_last{Tuesday}}; 44 constexpr sys_days sd{ymwdl}; 45 46 static_assert(sd.time_since_epoch() == days{26}, ""); 47 } 48 49 { // Last Tuesday in Jan 2000 was the 25th 50 constexpr year_month_weekday_last ymwdl{year{2000}, January, weekday_last{Tuesday}}; 51 constexpr sys_days sd{ymwdl}; 52 53 static_assert(sd.time_since_epoch() == days{10957+24}, ""); 54 } 55 56 { // Last Tuesday in Jan 1940 was the 30th 57 constexpr year_month_weekday_last ymwdl{year{1940}, January, weekday_last{Tuesday}}; 58 constexpr sys_days sd{ymwdl}; 59 60 static_assert(sd.time_since_epoch() == days{-10958+29}, ""); 61 } 62 63 { // Last Tuesday in Nov 1939 was the 28th 64 year_month_weekday_last ymdl{year{1939}, std::chrono::November, weekday_last{Tuesday}}; 65 sys_days sd{ymdl}; 66 67 assert(sd.time_since_epoch() == days{-(10957+35)}); 68 } 69 }