test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/index.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 year_month_weekday;

// constexpr unsigned index() const noexcept;
//  Returns: wdi_.index()

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

#include "test_macros.h"

int main()
{
    using year               = std::chrono::year;
    using month              = std::chrono::month;
    using day                = std::chrono::day;
    using weekday            = std::chrono::weekday;
    using weekday_indexed    = std::chrono::weekday_indexed;
    using year_month_weekday = std::chrono::year_month_weekday;

    ASSERT_NOEXCEPT(                    std::declval<const year_month_weekday>().index());
    ASSERT_SAME_TYPE(unsigned, decltype(std::declval<const year_month_weekday>().index()));

    static_assert( year_month_weekday{}.index() == 0, "");

    for (unsigned i = 1; i <= 50; ++i)
    {
        year_month_weekday ymwd0(year{1234}, month{2}, weekday_indexed{weekday{2}, i});
        assert(ymwd0.index() == i);
    }
}