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 operator sys_days() const noexcept; 15 // 16 // Returns: If y_.ok() && m_.ok() && wdi_.weekday().ok(), returns a 17 // sys_days that represents the date (index() - 1) * 7 days after the first 18 // weekday() of year()/month(). If index() is 0 the returned sys_days 19 // represents the date 7 days prior to the first weekday() of 20 // year()/month(). Otherwise the returned value is unspecified. 21 // 22 23 #include <chrono> 24 #include <type_traits> 25 #include <cassert> 26 27 #include "test_macros.h" 28 29 int main() 30 { 31 using year = std::chrono::year; 32 using month = std::chrono::month; 33 using weekday_indexed = std::chrono::weekday_indexed; 34 using sys_days = std::chrono::sys_days; 35 using days = std::chrono::days; 36 using year_month_weekday = std::chrono::year_month_weekday; 37 38 ASSERT_NOEXCEPT(sys_days(std::declval<year_month_weekday>())); 39 40 { 41 constexpr year_month_weekday ymwd{year{1970}, month{1}, weekday_indexed{std::chrono::Thursday, 1}}; 42 constexpr sys_days sd{ymwd}; 43 44 static_assert( sd.time_since_epoch() == days{0}, ""); 45 static_assert( year_month_weekday{sd} == ymwd, ""); // and back 46 } 47 48 { 49 constexpr year_month_weekday ymwd{year{2000}, month{2}, weekday_indexed{std::chrono::Wednesday, 1}}; 50 constexpr sys_days sd{ymwd}; 51 52 static_assert( sd.time_since_epoch() == days{10957+32}, ""); 53 static_assert( year_month_weekday{sd} == ymwd, ""); // and back 54 } 55 56 // There's one more leap day between 1/1/40 and 1/1/70 57 // when compared to 1/1/70 -> 1/1/2000 58 { 59 constexpr year_month_weekday ymwd{year{1940}, month{1},weekday_indexed{std::chrono::Tuesday, 1}}; 60 constexpr sys_days sd{ymwd}; 61 62 static_assert( sd.time_since_epoch() == days{-10957}, ""); 63 static_assert( year_month_weekday{sd} == ymwd, ""); // and back 64 } 65 66 { 67 year_month_weekday ymwd{year{1939}, month{11}, weekday_indexed{std::chrono::Wednesday, 5}}; 68 sys_days sd{ymwd}; 69 70 assert( sd.time_since_epoch() == days{-(10957+34)}); 71 assert( year_month_weekday{sd} == ymwd); // and back 72 } 73 74 } 75
