| //===----------------------------------------------------------------------===// |
| // |
| // 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++03, c++11, c++14, c++17 |
| |
| // <chrono> |
| // class weekday; |
| |
| // constexpr weekday(const sys_days& dp) noexcept; |
| // |
| // Effects: Constructs an object of type weekday by computing what day |
| // of the week corresponds to the sys_days dp, and representing |
| // that day of the week in wd_ |
| // |
| // Remarks: For any value ymd of type year_month_day for which ymd.ok() is true, |
| // ymd == year_month_day{sys_days{ymd}} is true. |
| // |
| // [Example: |
| // If dp represents 1970-01-01, the constructed weekday represents Thursday by storing 4 in wd_. |
| // —end example] |
| |
| #include <chrono> |
| #include <type_traits> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| int main(int, char**) |
| { |
| using sys_days = std::chrono::sys_days; |
| using days = std::chrono::days; |
| using weekday = std::chrono::weekday; |
| |
| ASSERT_NOEXCEPT(weekday{std::declval<sys_days>()}); |
| |
| { |
| constexpr sys_days sd{}; // 1-Jan-1970 was a Thursday |
| constexpr weekday wd{sd}; |
| |
| static_assert( wd.ok(), ""); |
| static_assert( wd.c_encoding() == 4, ""); |
| } |
| |
| { |
| constexpr sys_days sd{days{10957+32}}; // 2-Feb-2000 was a Wednesday |
| constexpr weekday wd{sd}; |
| |
| static_assert( wd.ok(), ""); |
| static_assert( wd.c_encoding() == 3, ""); |
| } |
| |
| |
| { |
| constexpr sys_days sd{days{-10957}}; // 2-Jan-1940 was a Tuesday |
| constexpr weekday wd{sd}; |
| |
| static_assert( wd.ok(), ""); |
| static_assert( wd.c_encoding() == 2, ""); |
| } |
| |
| { |
| sys_days sd{days{-(10957+34)}}; // 29-Nov-1939 was a Wednesday |
| weekday wd{sd}; |
| |
| assert( wd.ok()); |
| assert( wd.c_encoding() == 3); |
| } |
| |
| return 0; |
| } |