| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 |
| |
| // <chrono> |
| // class year_month_day; |
| |
| // constexpr operator sys_days() const noexcept; |
| // |
| // Returns: If ok(), returns a sys_days holding a count of days from the |
| // sys_days epoch to *this (a negative value if *this represents a date |
| // prior to the sys_days epoch). Otherwise, if y_.ok() && m_.ok() is true, |
| // returns a sys_days which is offset from sys_days{y_/m_/last} by the |
| // number of days d_ is offset from sys_days{y_/m_/last}.day(). Otherwise |
| // the value returned is unspecified. |
| // |
| // Remarks: A sys_days in the range [days{-12687428}, days{11248737}] which |
| // is converted to a year_month_day shall have the same value when |
| // converted back to a sys_days. |
| // |
| // [Example: |
| // static_assert(year_month_day{sys_days{2017y/January/0}} == 2016y/December/31); |
| // static_assert(year_month_day{sys_days{2017y/January/31}} == 2017y/January/31); |
| // static_assert(year_month_day{sys_days{2017y/January/32}} == 2017y/February/1); |
| // —end example] |
| |
| #include <chrono> |
| #include <type_traits> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| void RunTheExample() |
| { |
| using namespace std::chrono; |
| |
| static_assert(year_month_day{sys_days{year{2017}/January/0}} == year{2016}/December/31); |
| static_assert(year_month_day{sys_days{year{2017}/January/31}} == year{2017}/January/31); |
| static_assert(year_month_day{sys_days{year{2017}/January/32}} == year{2017}/February/1); |
| } |
| |
| int main(int, char**) |
| { |
| using year = std::chrono::year; |
| using month = std::chrono::month; |
| using day = std::chrono::day; |
| using sys_days = std::chrono::sys_days; |
| using days = std::chrono::days; |
| using year_month_day = std::chrono::year_month_day; |
| |
| ASSERT_NOEXCEPT(sys_days(std::declval<year_month_day>())); |
| RunTheExample(); |
| |
| { |
| constexpr year_month_day ymd{year{1970}, month{1}, day{1}}; |
| constexpr sys_days sd{ymd}; |
| |
| static_assert( sd.time_since_epoch() == days{0}, ""); |
| static_assert( year_month_day{sd} == ymd, ""); // and back |
| } |
| |
| { |
| constexpr year_month_day ymd{year{2000}, month{2}, day{2}}; |
| constexpr sys_days sd{ymd}; |
| |
| static_assert( sd.time_since_epoch() == days{10957+32}, ""); |
| static_assert( year_month_day{sd} == ymd, ""); // and back |
| } |
| |
| // There's one more leap day between 1/1/40 and 1/1/70 |
| // when compared to 1/1/70 -> 1/1/2000 |
| { |
| constexpr year_month_day ymd{year{1940}, month{1}, day{2}}; |
| constexpr sys_days sd{ymd}; |
| |
| static_assert( sd.time_since_epoch() == days{-10957}, ""); |
| static_assert( year_month_day{sd} == ymd, ""); // and back |
| } |
| |
| { |
| year_month_day ymd{year{1939}, month{11}, day{29}}; |
| sys_days sd{ymd}; |
| |
| assert( sd.time_since_epoch() == days{-(10957+34)}); |
| assert( year_month_day{sd} == ymd); // and back |
| } |
| |
| return 0; |
| } |