76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2019 nanoric
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include "tz.h"
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#include <cassert>
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#include <type_traits>
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struct const_clock {
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using duration =
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typename std::common_type<std::chrono::system_clock::duration,
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date::days>::type;
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using rep = duration::rep;
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using period = duration::period;
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using time_point = std::chrono::time_point<const_clock, duration>;
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static constexpr date::sys_days epoch { date::days { 1000 } };
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template <typename Duration>
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static std::chrono::time_point<std::chrono::system_clock,
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typename std::common_type<Duration, date::days>::type>
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CONSTCD11 to_sys(std::chrono::time_point<const_clock, Duration> const& tp)
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{
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return epoch + tp.time_since_epoch();
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}
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template <typename Duration>
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static std::chrono::time_point<const_clock,
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typename std::common_type<Duration, date::days>::type>
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CONSTCD11 from_sys(
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std::chrono::time_point<std::chrono::system_clock, Duration> const&
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tp)
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{
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using res = std::chrono::time_point<const_clock,
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typename std::common_type<Duration, date::days>::type>;
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return res(tp - epoch);
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}
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};
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int main()
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{
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using namespace date;
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using namespace std::chrono;
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using const_days = time_point<const_clock, days>;
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CONSTCD14 sys_days sys { days { 1024 } };
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static_assert(sys.time_since_epoch().count() == 1024, "");
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CONSTCD14 const_days c {clock_cast<const_clock>(sys)};
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CONSTCD14 sys_days sys2 {clock_cast<system_clock>(c)};
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CONSTCD14 sys_days sys3 { clock_cast<system_clock>(const_days(days(48))) };
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#if __cplusplus >= 201402L
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static_assert(c.time_since_epoch().count() == 24, "");
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static_assert(sys2.time_since_epoch().count() == 1024, "");
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static_assert(sys3.time_since_epoch().count() == 1048, "");
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#endif
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}
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