1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 // For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html 11 12 #ifndef _LIBCPP___CHRONO_TZDB_LIST_H 13 #define _LIBCPP___CHRONO_TZDB_LIST_H 14 15 #include <version> 16 // Enable the contents of the header only when libc++ was built with experimental features enabled. 17 #if _LIBCPP_HAS_EXPERIMENTAL_TZDB 18 19 # include <__chrono/time_zone.h> 20 # include <__chrono/tzdb.h> 21 # include <__config> 22 # include <__fwd/string.h> 23 # include <forward_list> 24 # include <string_view> 25 26 # if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 27 # pragma GCC system_header 28 # endif 29 30 _LIBCPP_BEGIN_NAMESPACE_STD 31 32 # if _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION 33 34 namespace chrono { 35 36 // TODO TZDB 37 // Libc++ recently switched to only export __ugly_names from the dylib. 38 // Since the library is still experimental the functions in this header 39 // should be adapted to this new style. The other tzdb headers should be 40 // evaluated too. 41 42 class _LIBCPP_AVAILABILITY_TZDB tzdb_list { 43 public: 44 class __impl; // public to allow construction in dylib 45 _LIBCPP_HIDE_FROM_ABI explicit tzdb_list(__impl* __p) : __impl_(__p) { 46 _LIBCPP_ASSERT_NON_NULL(__impl_ != nullptr, "initialized time_zone without a valid pimpl object"); 47 } 48 _LIBCPP_EXPORTED_FROM_ABI ~tzdb_list(); 49 50 tzdb_list(const tzdb_list&) = delete; 51 tzdb_list& operator=(const tzdb_list&) = delete; 52 53 using const_iterator = forward_list<tzdb>::const_iterator; 54 55 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI const tzdb& front() const noexcept { return __front(); } 56 57 _LIBCPP_HIDE_FROM_ABI const_iterator erase_after(const_iterator __p) { return __erase_after(__p); } 58 59 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI const_iterator begin() const noexcept { return __begin(); } 60 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI const_iterator end() const noexcept { return __end(); } 61 62 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI const_iterator cbegin() const noexcept { return __cbegin(); } 63 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI const_iterator cend() const noexcept { return __cend(); } 64 65 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI __impl& __implementation() { return *__impl_; } 66 67 private: 68 [[nodiscard]] _LIBCPP_EXPORTED_FROM_ABI const tzdb& __front() const noexcept; 69 70 _LIBCPP_EXPORTED_FROM_ABI const_iterator __erase_after(const_iterator __p); 71 72 [[nodiscard]] _LIBCPP_EXPORTED_FROM_ABI const_iterator __begin() const noexcept; 73 [[nodiscard]] _LIBCPP_EXPORTED_FROM_ABI const_iterator __end() const noexcept; 74 75 [[nodiscard]] _LIBCPP_EXPORTED_FROM_ABI const_iterator __cbegin() const noexcept; 76 [[nodiscard]] _LIBCPP_EXPORTED_FROM_ABI const_iterator __cend() const noexcept; 77 78 __impl* __impl_; 79 }; 80 81 [[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI tzdb_list& get_tzdb_list(); 82 83 [[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline const tzdb& get_tzdb() { 84 return get_tzdb_list().front(); 85 } 86 87 [[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline const time_zone* locate_zone(string_view __name) { 88 return get_tzdb().locate_zone(__name); 89 } 90 91 [[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline const time_zone* current_zone() { 92 return get_tzdb().current_zone(); 93 } 94 95 _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI const tzdb& reload_tzdb(); 96 97 [[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI string remote_version(); 98 99 } // namespace chrono 100 101 # endif // _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && 102 // _LIBCPP_HAS_LOCALIZATION 103 104 _LIBCPP_END_NAMESPACE_STD 105 106 #endif // _LIBCPP_HAS_EXPERIMENTAL_TZDB 107 108 #endif // _LIBCPP___CHRONO_TZDB_LIST_H 109