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135 lines
4.9 KiB
C++
135 lines
4.9 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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// For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
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#ifndef _LIBCPP___CHRONO_EXCEPTION_H
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#define _LIBCPP___CHRONO_EXCEPTION_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 !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
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# include <__chrono/calendar.h>
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# include <__chrono/local_info.h>
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# include <__chrono/time_point.h>
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# include <__config>
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# include <__configuration/availability.h>
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# include <__verbose_abort>
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# include <format>
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# include <stdexcept>
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# include <string>
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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_BEGIN_NAMESPACE_STD
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# if _LIBCPP_STD_VER >= 20
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namespace chrono {
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class nonexistent_local_time : public runtime_error {
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public:
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template <class _Duration>
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_LIBCPP_HIDE_FROM_ABI nonexistent_local_time(const local_time<_Duration>& __time, const local_info& __info)
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: runtime_error{__create_message(__time, __info)} {
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// [time.zone.exception.nonexist]/2
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// Preconditions: i.result == local_info::nonexistent is true.
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// The value of __info.result is not used.
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_LIBCPP_ASSERT_PEDANTIC(__info.result == local_info::nonexistent,
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"creating an nonexistent_local_time from a local_info that is not non-existent");
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}
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_LIBCPP_HIDE_FROM_ABI nonexistent_local_time(const nonexistent_local_time&) = default;
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_LIBCPP_HIDE_FROM_ABI nonexistent_local_time& operator=(const nonexistent_local_time&) = default;
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_LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI ~nonexistent_local_time() override; // exported as key function
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private:
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template <class _Duration>
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_LIBCPP_HIDE_FROM_ABI string __create_message(const local_time<_Duration>& __time, const local_info& __info) {
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return std::format(
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R"({} is in a gap between
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{} {} and
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{} {} which are both equivalent to
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{} UTC)",
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__time,
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local_seconds{__info.first.end.time_since_epoch()} + __info.first.offset,
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__info.first.abbrev,
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local_seconds{__info.second.begin.time_since_epoch()} + __info.second.offset,
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__info.second.abbrev,
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__info.first.end);
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}
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};
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template <class _Duration>
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_LIBCPP_NORETURN _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_nonexistent_local_time(
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[[maybe_unused]] const local_time<_Duration>& __time, [[maybe_unused]] const local_info& __info) {
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# ifndef _LIBCPP_HAS_NO_EXCEPTIONS
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throw nonexistent_local_time(__time, __info);
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# else
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_LIBCPP_VERBOSE_ABORT("nonexistent_local_time was thrown in -fno-exceptions mode");
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# endif
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}
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class ambiguous_local_time : public runtime_error {
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public:
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template <class _Duration>
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_LIBCPP_HIDE_FROM_ABI ambiguous_local_time(const local_time<_Duration>& __time, const local_info& __info)
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: runtime_error{__create_message(__time, __info)} {
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// [time.zone.exception.ambig]/2
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// Preconditions: i.result == local_info::ambiguous is true.
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// The value of __info.result is not used.
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_LIBCPP_ASSERT_PEDANTIC(__info.result == local_info::ambiguous,
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"creating an ambiguous_local_time from a local_info that is not ambiguous");
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}
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_LIBCPP_HIDE_FROM_ABI ambiguous_local_time(const ambiguous_local_time&) = default;
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_LIBCPP_HIDE_FROM_ABI ambiguous_local_time& operator=(const ambiguous_local_time&) = default;
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_LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI ~ambiguous_local_time() override; // exported as key function
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private:
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template <class _Duration>
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_LIBCPP_HIDE_FROM_ABI string __create_message(const local_time<_Duration>& __time, const local_info& __info) {
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return std::format(
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// There are two spaces after the full-stop; this has been verified
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// in the sources of the Standard.
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R"({0} is ambiguous. It could be
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{0} {1} == {2} UTC or
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{0} {3} == {4} UTC)",
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__time,
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__info.first.abbrev,
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__time - __info.first.offset,
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__info.second.abbrev,
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__time - __info.second.offset);
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}
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};
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template <class _Duration>
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_LIBCPP_NORETURN _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_ambiguous_local_time(
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[[maybe_unused]] const local_time<_Duration>& __time, [[maybe_unused]] const local_info& __info) {
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# ifndef _LIBCPP_HAS_NO_EXCEPTIONS
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throw ambiguous_local_time(__time, __info);
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# else
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_LIBCPP_VERBOSE_ABORT("ambiguous_local_time was thrown in -fno-exceptions mode");
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# endif
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}
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} // namespace chrono
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# endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
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#endif // _LIBCPP___CHRONO_EXCEPTION_H
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