Release Cosmopolitan v3.6.0

This release is an atomic upgrade to GCC 14.1.0 with C23 and C++23

third_party/libcxx/__chrono/time_zone.h

@@ -0,0 +1,182 @@
+// -*- 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
+//
+//===----------------------------------------------------------------------===//
+
+// For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
+
+#ifndef _LIBCPP___CHRONO_TIME_ZONE_H
+#define _LIBCPP___CHRONO_TIME_ZONE_H
+
+#include <version>
+// Enable the contents of the header only when libc++ was built with experimental features enabled.
+#if !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
+
+#  include <__chrono/calendar.h>
+#  include <__chrono/duration.h>
+#  include <__chrono/exception.h>
+#  include <__chrono/local_info.h>
+#  include <__chrono/sys_info.h>
+#  include <__chrono/system_clock.h>
+#  include <__compare/strong_order.h>
+#  include <__config>
+#  include <__memory/unique_ptr.h>
+#  include <__type_traits/common_type.h>
+#  include <string_view>
+
+#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#    pragma GCC system_header
+#  endif
+
+_LIBCPP_PUSH_MACROS
+#  include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#  if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_TIME_ZONE_DATABASE) && !defined(_LIBCPP_HAS_NO_FILESYSTEM) &&   \
+      !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+
+namespace chrono {
+
+enum class choose { earliest, latest };
+
+class _LIBCPP_AVAILABILITY_TZDB time_zone {
+  _LIBCPP_HIDE_FROM_ABI time_zone() = default;
+
+public:
+  class __impl; // public so it can be used by make_unique.
+
+  // The "constructor".
+  //
+  // The default constructor is private to avoid the constructor from being
+  // part of the ABI. Instead use an __ugly_named function as an ABI interface,
+  // since that gives us the ability to change it in the future.
+  [[nodiscard]] _LIBCPP_EXPORTED_FROM_ABI static time_zone __create(unique_ptr<__impl>&& __p);
+
+  _LIBCPP_EXPORTED_FROM_ABI ~time_zone();
+
+  _LIBCPP_HIDE_FROM_ABI time_zone(time_zone&&)            = default;
+  _LIBCPP_HIDE_FROM_ABI time_zone& operator=(time_zone&&) = default;
+
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI string_view name() const noexcept { return __name(); }
+
+  template <class _Duration>
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI sys_info get_info(const sys_time<_Duration>& __time) const {
+    return __get_info(chrono::time_point_cast<seconds>(__time));
+  }
+
+  template <class _Duration>
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI local_info get_info(const local_time<_Duration>& __time) const {
+    return __get_info(chrono::time_point_cast<seconds>(__time));
+  }
+
+  // We don't apply nodiscard here since this function throws on many inputs,
+  // so it could be used as a validation.
+  template <class _Duration>
+  _LIBCPP_HIDE_FROM_ABI sys_time<common_type_t<_Duration, seconds>> to_sys(const local_time<_Duration>& __time) const {
+    local_info __info = get_info(__time);
+    switch (__info.result) {
+    case local_info::unique:
+      return sys_time<common_type_t<_Duration, seconds>>{__time.time_since_epoch() - __info.first.offset};
+
+    case local_info::nonexistent:
+      chrono::__throw_nonexistent_local_time(__time, __info);
+
+    case local_info::ambiguous:
+      chrono::__throw_ambiguous_local_time(__time, __info);
+    }
+
+    // TODO TZDB The Standard does not specify anything in these cases.
+    _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
+        __info.result != -1, "cannot convert the local time; it would be before the minimum system clock value");
+    _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
+        __info.result != -2, "cannot convert the local time; it would be after the maximum system clock value");
+
+    return {};
+  }
+
+  template <class _Duration>
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI sys_time<common_type_t<_Duration, seconds>>
+  to_sys(const local_time<_Duration>& __time, choose __z) const {
+    local_info __info = get_info(__time);
+    switch (__info.result) {
+    case local_info::unique:
+    case local_info::nonexistent: // first and second are the same
+      return sys_time<common_type_t<_Duration, seconds>>{__time.time_since_epoch() - __info.first.offset};
+
+    case local_info::ambiguous:
+      switch (__z) {
+      case choose::earliest:
+        return sys_time<common_type_t<_Duration, seconds>>{__time.time_since_epoch() - __info.first.offset};
+
+      case choose::latest:
+        return sys_time<common_type_t<_Duration, seconds>>{__time.time_since_epoch() - __info.second.offset};
+
+        // Note a value out of bounds is not specified.
+      }
+    }
+
+    // TODO TZDB The standard does not specify anything in these cases.
+    _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
+        __info.result != -1, "cannot convert the local time; it would be before the minimum system clock value");
+    _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
+        __info.result != -2, "cannot convert the local time; it would be after the maximum system clock value");
+
+    return {};
+  }
+
+  template <class _Duration>
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI local_time<common_type_t<_Duration, seconds>>
+  to_local(const sys_time<_Duration>& __time) const {
+    using _Dp = common_type_t<_Duration, seconds>;
+
+    sys_info __info = get_info(__time);
+
+    _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
+        __info.offset >= chrono::seconds{0} || __time.time_since_epoch() >= _Dp::min() - __info.offset,
+        "cannot convert the system time; it would be before the minimum local clock value");
+
+    _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
+        __info.offset <= chrono::seconds{0} || __time.time_since_epoch() <= _Dp::max() - __info.offset,
+        "cannot convert the system time; it would be after the maximum local clock value");
+
+    return local_time<_Dp>{__time.time_since_epoch() + __info.offset};
+  }
+
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI const __impl& __implementation() const noexcept { return *__impl_; }
+
+private:
+  [[nodiscard]] _LIBCPP_EXPORTED_FROM_ABI string_view __name() const noexcept;
+
+  [[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI sys_info __get_info(sys_seconds __time) const;
+  [[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI local_info __get_info(local_seconds __time) const;
+
+  unique_ptr<__impl> __impl_;
+};
+
+[[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline bool
+operator==(const time_zone& __x, const time_zone& __y) noexcept {
+  return __x.name() == __y.name();
+}
+
+[[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline strong_ordering
+operator<=>(const time_zone& __x, const time_zone& __y) noexcept {
+  return __x.name() <=> __y.name();
+}
+
+} // namespace chrono
+
+#  endif // _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_TIME_ZONE_DATABASE) && !defined(_LIBCPP_HAS_NO_FILESYSTEM)
+         // && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
+
+#endif // _LIBCPP___CHRONO_TIME_ZONE_H