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95 lines
3.1 KiB
C++
95 lines
3.1 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_day;
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// constexpr operator sys_days() const noexcept;
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//
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// Returns: If ok(), returns a sys_days holding a count of days from the
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// sys_days epoch to *this (a negative value if *this represents a date
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// prior to the sys_days epoch). Otherwise, if y_.ok() && m_.ok() is true,
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// returns a sys_days which is offset from sys_days{y_/m_/last} by the
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// number of days d_ is offset from sys_days{y_/m_/last}.day(). Otherwise
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// the value returned is unspecified.
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//
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// Remarks: A sys_days in the range [days{-12687428}, days{11248737}] which
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// is converted to a year_month_day shall have the same value when
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// converted back to a sys_days.
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//
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// [Example:
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// static_assert(year_month_day{sys_days{2017y/January/0}} == 2016y/December/31);
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// static_assert(year_month_day{sys_days{2017y/January/31}} == 2017y/January/31);
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// static_assert(year_month_day{sys_days{2017y/January/32}} == 2017y/February/1);
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// —end example]
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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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void RunTheExample()
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{
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using namespace std::chrono;
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static_assert(year_month_day{sys_days{year{2017}/January/0}} == year{2016}/December/31);
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static_assert(year_month_day{sys_days{year{2017}/January/31}} == year{2017}/January/31);
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static_assert(year_month_day{sys_days{year{2017}/January/32}} == year{2017}/February/1);
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}
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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 day = std::chrono::day;
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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_day = std::chrono::year_month_day;
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ASSERT_NOEXCEPT(sys_days(std::declval<year_month_day>()));
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RunTheExample();
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{
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constexpr year_month_day ymd{year{1970}, month{1}, day{1}};
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constexpr sys_days sd{ymd};
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static_assert( sd.time_since_epoch() == days{0}, "");
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static_assert( year_month_day{sd} == ymd, ""); // and back
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}
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{
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constexpr year_month_day ymd{year{2000}, month{2}, day{2}};
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constexpr sys_days sd{ymd};
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static_assert( sd.time_since_epoch() == days{10957+32}, "");
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static_assert( year_month_day{sd} == ymd, ""); // 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_day ymd{year{1940}, month{1}, day{2}};
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constexpr sys_days sd{ymd};
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static_assert( sd.time_since_epoch() == days{-10957}, "");
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static_assert( year_month_day{sd} == ymd, ""); // and back
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}
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{
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year_month_day ymd{year{1939}, month{11}, day{29}};
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sys_days sd{ymd};
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assert( sd.time_since_epoch() == days{-(10957+34)});
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assert( year_month_day{sd} == ymd); // and back
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}
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}
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