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//===----------------------------------------------------------------------===//
//
// 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;
}
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