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75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <chrono>
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// class year_month_weekday;
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// constexpr operator sys_days() const noexcept;
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//
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// Returns: If y_.ok() && m_.ok() && wdi_.weekday().ok(), returns a
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// sys_days that represents the date (index() - 1) * 7 days after the first
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// weekday() of year()/month(). If index() is 0 the returned sys_days
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// represents the date 7 days prior to the first weekday() of
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// year()/month(). Otherwise the returned value is unspecified.
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//
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#include <chrono>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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int main()
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{
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using year = std::chrono::year;
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using month = std::chrono::month;
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using weekday_indexed = std::chrono::weekday_indexed;
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using sys_days = std::chrono::sys_days;
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using days = std::chrono::days;
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using year_month_weekday = std::chrono::year_month_weekday;
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ASSERT_NOEXCEPT(sys_days(std::declval<year_month_weekday>()));
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{
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constexpr year_month_weekday ymwd{year{1970}, month{1}, weekday_indexed{std::chrono::Thursday, 1}};
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constexpr sys_days sd{ymwd};
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static_assert( sd.time_since_epoch() == days{0}, "");
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static_assert( year_month_weekday{sd} == ymwd, ""); // and back
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}
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{
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constexpr year_month_weekday ymwd{year{2000}, month{2}, weekday_indexed{std::chrono::Wednesday, 1}};
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constexpr sys_days sd{ymwd};
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static_assert( sd.time_since_epoch() == days{10957+32}, "");
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static_assert( year_month_weekday{sd} == ymwd, ""); // and back
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}
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// There's one more leap day between 1/1/40 and 1/1/70
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// when compared to 1/1/70 -> 1/1/2000
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{
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constexpr year_month_weekday ymwd{year{1940}, month{1},weekday_indexed{std::chrono::Tuesday, 1}};
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constexpr sys_days sd{ymwd};
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static_assert( sd.time_since_epoch() == days{-10957}, "");
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static_assert( year_month_weekday{sd} == ymwd, ""); // and back
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}
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{
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year_month_weekday ymwd{year{1939}, month{11}, weekday_indexed{std::chrono::Wednesday, 5}};
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sys_days sd{ymwd};
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assert( sd.time_since_epoch() == days{-(10957+34)});
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assert( year_month_weekday{sd} == ymwd); // and back
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}
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}
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