76 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8// UNSUPPORTED: c++03, c++11, c++14, c++179 10// <chrono>11// class weekday;12 13// constexpr weekday(const local_days& dp) noexcept;14//15// Effects: Constructs an object of type weekday by computing what day16// of the week corresponds to the local_days dp, and representing17// that day of the week in wd_18//19// Remarks: For any value ymd of type year_month_day for which ymd.ok() is true,20// ymd == year_month_day{sys_days{ymd}} is true.21//22// [Example:23// If dp represents 1970-01-01, the constructed weekday represents Thursday by storing 4 in wd_.24// -end example]25 26#include <chrono>27#include <cassert>28#include <type_traits>29#include <utility>30 31#include "test_macros.h"32 33int main(int, char**)34{35 using local_days = std::chrono::local_days;36 using days = std::chrono::days;37 using weekday = std::chrono::weekday;38 39 ASSERT_NOEXCEPT(weekday{std::declval<local_days>()});40 41 {42 constexpr local_days sd{}; // 1-Jan-1970 was a Thursday43 constexpr weekday wd{sd};44 45 static_assert( wd.ok(), "");46 static_assert( wd.c_encoding() == 4, "");47 }48 49 {50 constexpr local_days sd{days{10957+32}}; // 2-Feb-2000 was a Wednesday51 constexpr weekday wd{sd};52 53 static_assert( wd.ok(), "");54 static_assert( wd.c_encoding() == 3, "");55 }56 57 58 {59 constexpr local_days sd{days{-10957}}; // 2-Jan-1940 was a Tuesday60 constexpr weekday wd{sd};61 62 static_assert( wd.ok(), "");63 static_assert( wd.c_encoding() == 2, "");64 }65 66 {67 local_days sd{days{-(10957+34)}}; // 29-Nov-1939 was a Wednesday68 weekday wd{sd};69 70 assert( wd.ok());71 assert( wd.c_encoding() == 3);72 }73 74 return 0;75}76