ad2fbea797
This has the benefit of consistent placement for these macros (outside the namespace, not inside it). This, in turn, makes it more obvious that the condition applies to the entire namespace scope. Compile times are also reduced a bit, since the compiler doesn't have to open a namespace just to close it again. This is enforced with a clang-tidy check. As a drive-by this also fixes a few macro comments.
90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CHRONO_GPS_CLOCK_H
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#define _LIBCPP___CHRONO_GPS_CLOCK_H
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#include <version>
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// Enable the contents of the header only when libc++ was built with experimental features enabled.
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#if _LIBCPP_HAS_EXPERIMENTAL_TZDB
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# include <__assert>
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# include <__chrono/duration.h>
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# include <__chrono/time_point.h>
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# include <__chrono/utc_clock.h>
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# include <__config>
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# include <__type_traits/common_type.h>
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# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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# endif
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_LIBCPP_PUSH_MACROS
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# include <__undef_macros>
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# if _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace chrono {
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class gps_clock;
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template <class _Duration>
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using gps_time = time_point<gps_clock, _Duration>;
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using gps_seconds = gps_time<seconds>;
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class gps_clock {
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public:
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using rep = utc_clock::rep;
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using period = utc_clock::period;
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using duration = chrono::duration<rep, period>;
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using time_point = chrono::time_point<gps_clock>;
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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.
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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>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI static utc_time<common_type_t<_Duration, seconds>>
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to_utc(const gps_time<_Duration>& __time) noexcept {
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using _Rp = common_type_t<_Duration, seconds>;
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_Duration __time_since_epoch = __time.time_since_epoch();
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_LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(__time_since_epoch >= utc_time<_Rp>::min().time_since_epoch() + __offset,
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"the GPS to UTC conversion would underflow");
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return utc_time<_Rp>{__time_since_epoch + __offset};
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}
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template <class _Duration>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI static gps_time<common_type_t<_Duration, seconds>>
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from_utc(const utc_time<_Duration>& __time) noexcept {
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using _Rp = common_type_t<_Duration, seconds>;
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_Duration __time_since_epoch = __time.time_since_epoch();
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_LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(__time_since_epoch <= utc_time<_Rp>::max().time_since_epoch() - __offset,
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"the UTC to GPS conversion would overflow");
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return gps_time<_Rp>{__time_since_epoch - __offset};
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}
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};
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} // namespace chrono
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_LIBCPP_END_NAMESPACE_STD
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# endif // _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM &&
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// _LIBCPP_HAS_LOCALIZATION
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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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