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Add constexpr for clock_cast.
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nanoric
Howard Hinnant
parent
b9cd9c3fde
commit
66a5aa482e
@ -2288,6 +2288,7 @@ template <>
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struct clock_time_conversion<std::chrono::system_clock, std::chrono::system_clock>
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{
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template <class Duration>
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CONSTCD14
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sys_time<Duration>
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operator()(const sys_time<Duration>& st) const
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{
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@ -2299,6 +2300,7 @@ template <>
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struct clock_time_conversion<utc_clock, utc_clock>
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{
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template <class Duration>
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CONSTCD14
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utc_time<Duration>
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operator()(const utc_time<Duration>& ut) const
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{
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@ -2310,6 +2312,7 @@ template<>
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struct clock_time_conversion<local_t, local_t>
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{
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template <class Duration>
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CONSTCD14
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local_time<Duration>
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operator()(const local_time<Duration>& lt) const
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{
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@ -2343,6 +2346,7 @@ template<>
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struct clock_time_conversion<local_t, std::chrono::system_clock>
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{
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template <class Duration>
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CONSTCD14
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local_time<Duration>
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operator()(const sys_time<Duration>& st) const
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{
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@ -2354,6 +2358,7 @@ template<>
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struct clock_time_conversion<std::chrono::system_clock, local_t>
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{
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template <class Duration>
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CONSTCD14
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sys_time<Duration>
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operator()(const local_time<Duration>& lt) const
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{
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@ -2387,6 +2392,7 @@ template<typename Clock>
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struct clock_time_conversion<Clock, Clock>
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{
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template <class Duration>
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CONSTCD14
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std::chrono::time_point<Clock, Duration>
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operator()(const std::chrono::time_point<Clock, Duration>& tp) const
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{
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@ -2533,6 +2539,7 @@ template <class SrcClock>
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struct clock_time_conversion<std::chrono::system_clock, SrcClock>
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{
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template <class Duration>
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CONSTCD14
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typename ctc_detail::return_to_sys<SrcClock, Duration>::type
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operator()(const std::chrono::time_point<SrcClock, Duration>& tp) const
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{
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@ -2544,6 +2551,7 @@ template <class DstClock>
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struct clock_time_conversion<DstClock, std::chrono::system_clock>
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{
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template <class Duration>
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CONSTCD14
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typename ctc_detail::return_from_sys<DstClock, Duration>::type
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operator()(const sys_time<Duration>& st) const
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{
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@ -2555,6 +2563,7 @@ template <class SrcClock>
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struct clock_time_conversion<utc_clock, SrcClock>
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{
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template <class Duration>
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CONSTCD14
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typename ctc_detail::return_to_utc<SrcClock, Duration>::type
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operator()(const std::chrono::time_point<SrcClock, Duration>& tp) const
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{
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@ -2566,6 +2575,7 @@ template <class DstClock>
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struct clock_time_conversion<DstClock, utc_clock>
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{
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template <class Duration>
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CONSTCD14
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typename ctc_detail::return_from_utc<DstClock, Duration>::type
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operator()(const utc_time<Duration>& ut) const
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{
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@ -2577,6 +2587,7 @@ template<typename SrcClock>
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struct clock_time_conversion<local_t, SrcClock>
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{
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template <class Duration>
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CONSTCD14
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typename ctc_detail::return_to_local<SrcClock, Duration>::type
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operator()(const std::chrono::time_point<SrcClock, Duration>& tp) const
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{
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@ -2588,6 +2599,7 @@ template<typename DstClock>
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struct clock_time_conversion<DstClock, local_t>
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{
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template <class Duration>
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CONSTCD14
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typename ctc_detail::return_from_local<DstClock, Duration>::type
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operator()(const local_time<Duration>& lt) const
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{
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@ -2603,6 +2615,7 @@ template <class Clock, class Duration>
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using std::chrono::system_clock;
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template <class DstClock, class SrcClock, class Duration>
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CONSTCD14
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auto
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conv_clock(const time_point<SrcClock, Duration>& t)
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-> decltype(std::declval<clock_time_conversion<DstClock, SrcClock>>()(t))
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@ -2612,6 +2625,7 @@ conv_clock(const time_point<SrcClock, Duration>& t)
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//direct trait conversion, 1st candidate
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template <class DstClock, class SrcClock, class Duration>
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CONSTCD14
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auto
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cc_impl(const time_point<SrcClock, Duration>& t, const time_point<SrcClock, Duration>*)
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-> decltype(conv_clock<DstClock>(t))
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@ -2621,6 +2635,7 @@ cc_impl(const time_point<SrcClock, Duration>& t, const time_point<SrcClock, Dura
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//conversion through sys, 2nd candidate
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template <class DstClock, class SrcClock, class Duration>
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CONSTCD14
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auto
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cc_impl(const time_point<SrcClock, Duration>& t, const void*)
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-> decltype(conv_clock<DstClock>(conv_clock<system_clock>(t)))
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@ -2630,6 +2645,7 @@ cc_impl(const time_point<SrcClock, Duration>& t, const void*)
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//conversion through utc, 2nd candidate
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template <class DstClock, class SrcClock, class Duration>
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CONSTCD14
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auto
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cc_impl(const time_point<SrcClock, Duration>& t, const void*)
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-> decltype(0, // MSVC_WORKAROUND
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@ -2640,6 +2656,7 @@ cc_impl(const time_point<SrcClock, Duration>& t, const void*)
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//conversion through sys and utc, 3rd candidate
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template <class DstClock, class SrcClock, class Duration>
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CONSTCD14
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auto
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cc_impl(const time_point<SrcClock, Duration>& t, ...)
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-> decltype(conv_clock<DstClock>(conv_clock<utc_clock>(conv_clock<system_clock>(t))))
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@ -2649,6 +2666,7 @@ cc_impl(const time_point<SrcClock, Duration>& t, ...)
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//conversion through utc and sys, 3rd candidate
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template <class DstClock, class SrcClock, class Duration>
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CONSTCD14
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auto
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cc_impl(const time_point<SrcClock, Duration>& t, ...)
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-> decltype(0, // MSVC_WORKAROUND
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@ -2660,6 +2678,7 @@ cc_impl(const time_point<SrcClock, Duration>& t, ...)
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} // namespace clock_cast_detail
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template <class DstClock, class SrcClock, class Duration>
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CONSTCD14
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auto
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clock_cast(const std::chrono::time_point<SrcClock, Duration>& tp)
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-> decltype(clock_cast_detail::cc_impl<DstClock>(tp, &tp))
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75
test/clock_cast_test/constexpr.pass.cpp
Normal file
75
test/clock_cast_test/constexpr.pass.cpp
Normal file
@ -0,0 +1,75 @@
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// 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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