test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/ctor.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17

// <chrono>
// class day;

//                     day() = default;
//  explicit constexpr day(unsigned d) noexcept;
//  explicit constexpr operator unsigned() const noexcept;

//  Effects: Constructs an object of type day by initializing d_ with d.
//    The value held is unspecified if d is not in the range [0, 255].

#include <chrono>
#include <type_traits>
#include <cassert>

#include "test_macros.h"

int main()
{
    using day = std::chrono::day;

    ASSERT_NOEXCEPT(day{});
    ASSERT_NOEXCEPT(day(0U));
    ASSERT_NOEXCEPT(static_cast<unsigned>(day(0U)));
    
    constexpr day d0{};
    static_assert(static_cast<unsigned>(d0) == 0, "");
    
    constexpr day d1{1};
    static_assert(static_cast<unsigned>(d1) == 1, "");
    
    for (unsigned i = 0; i <= 255; ++i)
    {
        day day(i);
        assert(static_cast<unsigned>(day) == i);
    }
}