256be56344
-- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_
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#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_
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#include <chrono>
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#include <cstdint>
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#include <memory>
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#include <string>
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#include "absl/time/internal/cctz/include/cctz/civil_time.h"
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#include "absl/time/internal/cctz/include/cctz/time_zone.h"
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namespace absl {
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namespace time_internal {
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namespace cctz {
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// A simple interface used to hide time-zone complexities from time_zone::Impl.
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// Subclasses implement the functions for civil-time conversions in the zone.
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class TimeZoneIf {
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public:
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// A factory function for TimeZoneIf implementations.
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static std::unique_ptr<TimeZoneIf> Load(const std::string& name);
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virtual ~TimeZoneIf();
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virtual time_zone::absolute_lookup BreakTime(
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const time_point<seconds>& tp) const = 0;
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virtual time_zone::civil_lookup MakeTime(
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const civil_second& cs) const = 0;
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virtual bool NextTransition(const time_point<seconds>& tp,
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time_zone::civil_transition* trans) const = 0;
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virtual bool PrevTransition(const time_point<seconds>& tp,
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time_zone::civil_transition* trans) const = 0;
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virtual std::string Version() const = 0;
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virtual std::string Description() const = 0;
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protected:
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TimeZoneIf() {}
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};
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// Convert between time_point<seconds> and a count of seconds since the
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// Unix epoch. We assume that the std::chrono::system_clock and the
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// Unix clock are second aligned, but not that they share an epoch.
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inline std::int_fast64_t ToUnixSeconds(const time_point<seconds>& tp) {
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return (tp - std::chrono::time_point_cast<seconds>(
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std::chrono::system_clock::from_time_t(0))).count();
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}
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inline time_point<seconds> FromUnixSeconds(std::int_fast64_t t) {
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return std::chrono::time_point_cast<seconds>(
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std::chrono::system_clock::from_time_t(0)) + seconds(t);
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}
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} // namespace cctz
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} // namespace time_internal
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} // namespace absl
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#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_
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