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[libc++][chrono] implements GPS clock. #125921
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| // -*- C++ -*- | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #ifndef _LIBCPP___CHRONO_GPS_CLOCK_H | ||
| #define _LIBCPP___CHRONO_GPS_CLOCK_H | ||
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| #include <version> | ||
| // Enable the contents of the header only when libc++ was built with experimental features enabled. | ||
| #if _LIBCPP_HAS_EXPERIMENTAL_TZDB | ||
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| # include <__assert> | ||
| # include <__chrono/duration.h> | ||
| # include <__chrono/time_point.h> | ||
| # include <__chrono/utc_clock.h> | ||
| # include <__config> | ||
| # include <__type_traits/common_type.h> | ||
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| # if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) | ||
| # pragma GCC system_header | ||
| # endif | ||
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| _LIBCPP_PUSH_MACROS | ||
| # include <__undef_macros> | ||
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| _LIBCPP_BEGIN_NAMESPACE_STD | ||
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| # if _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION | ||
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| namespace chrono { | ||
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| class gps_clock; | ||
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| template <class _Duration> | ||
| using gps_time = time_point<gps_clock, _Duration>; | ||
| using gps_seconds = gps_time<seconds>; | ||
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| class gps_clock { | ||
| public: | ||
| using rep = utc_clock::rep; | ||
| using period = utc_clock::period; | ||
| using duration = chrono::duration<rep, period>; | ||
| using time_point = chrono::time_point<gps_clock>; | ||
| static constexpr bool is_steady = false; // The utc_clock is not steady. | ||
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| // The static difference between UTC and GPS time as specified in the Standard. | ||
| static constexpr chrono::seconds __offset{315964809}; | ||
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| [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static time_point now() { return from_utc(utc_clock::now()); } | ||
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| template <class _Duration> | ||
| [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static utc_time<common_type_t<_Duration, seconds>> | ||
| to_utc(const gps_time<_Duration>& __time) noexcept { | ||
| using _Rp = common_type_t<_Duration, seconds>; | ||
| _Duration __time_since_epoch = __time.time_since_epoch(); | ||
| _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(__time_since_epoch >= utc_time<_Rp>::min().time_since_epoch() + __offset, | ||
| "the GPS to UTC conversion would underflow"); | ||
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| return utc_time<_Rp>{__time_since_epoch + __offset}; | ||
| } | ||
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| template <class _Duration> | ||
| [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static gps_time<common_type_t<_Duration, seconds>> | ||
| from_utc(const utc_time<_Duration>& __time) noexcept { | ||
| using _Rp = common_type_t<_Duration, seconds>; | ||
| _Duration __time_since_epoch = __time.time_since_epoch(); | ||
| _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(__time_since_epoch <= utc_time<_Rp>::max().time_since_epoch() - __offset, | ||
| "the UTC to GPS conversion would overflow"); | ||
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| return gps_time<_Rp>{__time_since_epoch - __offset}; | ||
| } | ||
| }; | ||
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| } // namespace chrono | ||
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| # endif // _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && | ||
| // _LIBCPP_HAS_LOCALIZATION | ||
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| _LIBCPP_END_NAMESPACE_STD | ||
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| _LIBCPP_POP_MACROS | ||
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| #endif // _LIBCPP_HAS_EXPERIMENTAL_TZDB | ||
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| #endif // _LIBCPP___CHRONO_GPS_CLOCK_H |
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73 changes: 73 additions & 0 deletions
73
...est/libcxx/time/time.clock/time.clock.gps/time.clock.gps.members/assert.from_utc.pass.cpp
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| // REQUIRES: std-at-least-c++20 | ||
| // UNSUPPORTED: no-filesystem, no-localization, no-tzdb | ||
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| // XFAIL: libcpp-has-no-experimental-tzdb | ||
| // XFAIL: availability-tzdb-missing | ||
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| // REQUIRES: libcpp-hardening-mode={{extensive|debug}} | ||
| // REQUIRES: has-unix-headers | ||
| // XFAIL: libcpp-hardening-mode=debug && availability-verbose_abort-missing | ||
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| // <chrono> | ||
| // | ||
| // class gps_clock; | ||
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| // static gps_time<common_type_t<_Duration, seconds>> | ||
| // from_utc(const utc_time<_Duration>& t) noexcept; | ||
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| #include <chrono> | ||
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| #include "check_assertion.h" | ||
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| // The function is specified as | ||
| // gps_time<common_type_t<Duration, seconds>>{t.time_since_epoch()} + 378691210s | ||
| // When t == t.max() there will be a signed integral overflow (other values too). | ||
| int main(int, char**) { | ||
| using namespace std::literals::chrono_literals; | ||
| constexpr std::chrono::seconds offset{315964809}; | ||
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| (void)std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::nanoseconds>::max() - offset); | ||
| TEST_LIBCPP_ASSERT_FAILURE( | ||
| std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::nanoseconds>::max() - offset + 1ns), | ||
| "the UTC to GPS conversion would overflow"); | ||
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| (void)std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::microseconds>::max() - offset); | ||
| TEST_LIBCPP_ASSERT_FAILURE( | ||
| std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::microseconds>::max() - offset + 1us), | ||
| "the UTC to GPS conversion would overflow"); | ||
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| (void)std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::milliseconds>::max() - offset); | ||
| TEST_LIBCPP_ASSERT_FAILURE( | ||
| std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::milliseconds>::max() - offset + 1ms), | ||
| "the UTC to GPS conversion would overflow"); | ||
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| (void)std::chrono::gps_clock::from_utc(std::chrono::utc_seconds::max() - offset); | ||
| TEST_LIBCPP_ASSERT_FAILURE(std::chrono::gps_clock::from_utc(std::chrono::utc_seconds::max() - offset + 1s), | ||
| "the UTC to GPS conversion would overflow"); | ||
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| // The conversion uses `common_type_t<Duration, seconds>` so types "larger" | ||
| // than seconds are converted to seconds. Types "larger" than seconds are | ||
| // stored in "smaller" intergral and the overflow can never occur. | ||
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| // Validate the types can never overflow on all current (and future) supported platforms. | ||
| static_assert(std::chrono::utc_time<std::chrono::days>::max() <= std::chrono::utc_seconds::max() - offset); | ||
| static_assert(std::chrono::utc_time<std::chrono::weeks>::max() <= std::chrono::utc_seconds::max() - offset); | ||
| static_assert(std::chrono::utc_time<std::chrono::months>::max() <= std::chrono::utc_seconds::max() - offset); | ||
| static_assert(std::chrono::utc_time<std::chrono::years>::max() <= std::chrono::utc_seconds::max() - offset); | ||
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| // Validate the run-time conversion works. | ||
| (void)std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::days>::max()); | ||
| (void)std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::weeks>::max()); | ||
| (void)std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::months>::max()); | ||
| (void)std::chrono::gps_clock::from_utc(std::chrono::utc_time<std::chrono::years>::max()); | ||
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| return 0; | ||
| } |
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