| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 9 | |
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| 10 | // <chrono> |
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| 11 | // class weekday; |
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| 12 | |
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| 13 | // constexpr weekday(const sys_days& dp) noexcept; |
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| 14 | // |
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| 15 | // Effects: Constructs an object of type weekday by computing what day |
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| 16 | // of the week corresponds to the sys_days dp, and representing |
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| 17 | // that day of the week in wd_ |
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| 18 | // |
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| 19 | // Remarks: For any value ymd of type year_month_day for which ymd.ok() is true, |
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| 20 | // ymd == year_month_day{sys_days{ymd}} is true. |
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| 21 | // |
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| 22 | // [Example: |
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| 23 | // If dp represents 1970-01-01, the constructed weekday represents Thursday by storing 4 in wd_. |
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| 24 | // -end example] |
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| 25 | |
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| 26 | #include <chrono> |
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| 27 | #include <cassert> |
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| 28 | #include <type_traits> |
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| 29 | #include <utility> |
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| 30 | |
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| 31 | #include "test_macros.h" |
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| 32 | |
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| 33 | int main(int, char**) |
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| 34 | { |
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| 35 | using sys_days = std::chrono::sys_days; |
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| 36 | using days = std::chrono::days; |
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| 37 | using weekday = std::chrono::weekday; |
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| 38 | |
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| 39 | ASSERT_NOEXCEPT(weekday{std::declval<sys_days>()}); |
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| 40 | |
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| 41 | { |
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| 42 | constexpr sys_days sd{}; // 1-Jan-1970 was a Thursday |
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| 43 | constexpr weekday wd{sd}; |
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| 44 | |
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| 45 | static_assert( wd.ok(), "" ); |
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| 46 | static_assert( wd.c_encoding() == 4, "" ); |
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| 47 | } |
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| 48 | |
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| 49 | { |
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| 50 | constexpr sys_days sd{days{10957+32}}; // 2-Feb-2000 was a Wednesday |
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| 51 | constexpr weekday wd{sd}; |
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| 52 | |
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| 53 | static_assert( wd.ok(), "" ); |
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| 54 | static_assert( wd.c_encoding() == 3, "" ); |
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| 55 | } |
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| 56 | |
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| 57 | |
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| 58 | { |
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| 59 | constexpr sys_days sd{days{-10957}}; // 2-Jan-1940 was a Tuesday |
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| 60 | constexpr weekday wd{sd}; |
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| 61 | |
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| 62 | static_assert( wd.ok(), "" ); |
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| 63 | static_assert( wd.c_encoding() == 2, "" ); |
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| 64 | } |
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| 65 | |
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| 66 | { |
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| 67 | sys_days sd{days{-(10957+34)}}; // 29-Nov-1939 was a Wednesday |
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| 68 | weekday wd{sd}; |
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| 69 | |
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| 70 | assert( wd.ok()); |
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| 71 | assert( wd.c_encoding() == 3); |
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| 72 | } |
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| 73 | |
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| 74 | return 0; |
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| 75 | } |
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| 76 | |
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