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_TIME_ZONE_LINK_H |
13 | #define _LIBCPP___CHRONO_TIME_ZONE_LINK_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 <__compare/strong_order.h> |
20 | # include <__config> |
21 | # include <__utility/private_constructor_tag.h> |
22 | # include <string> |
23 | # include <string_view> |
24 | |
25 | # if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
26 | # pragma GCC system_header |
27 | # endif |
28 | |
29 | _LIBCPP_PUSH_MACROS |
30 | # include <__undef_macros> |
31 | |
32 | _LIBCPP_BEGIN_NAMESPACE_STD |
33 | |
34 | # if _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION |
35 | |
36 | namespace chrono { |
37 | |
38 | class time_zone_link { |
39 | public: |
40 | [[nodiscard]] |
41 | _LIBCPP_HIDE_FROM_ABI explicit time_zone_link(__private_constructor_tag, string_view __name, string_view __target) |
42 | : __name_{__name}, __target_{__target} {} |
43 | |
44 | _LIBCPP_HIDE_FROM_ABI time_zone_link(time_zone_link&&) = default; |
45 | _LIBCPP_HIDE_FROM_ABI time_zone_link& operator=(time_zone_link&&) = default; |
46 | |
47 | [[nodiscard]] _LIBCPP_HIDE_FROM_ABI string_view name() const noexcept { return __name_; } |
48 | [[nodiscard]] _LIBCPP_HIDE_FROM_ABI string_view target() const noexcept { return __target_; } |
49 | |
50 | private: |
51 | string __name_; |
52 | // TODO TZDB instead of the name we can store the pointer to a zone. These |
53 | // pointers are immutable. This makes it possible to directly return a |
54 | // pointer in the time_zone in the 'locate_zone' function. |
55 | string __target_; |
56 | }; |
57 | |
58 | [[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline bool |
59 | operator==(const time_zone_link& __x, const time_zone_link& __y) noexcept { |
60 | return __x.name() == __y.name(); |
61 | } |
62 | |
63 | [[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline strong_ordering |
64 | operator<=>(const time_zone_link& __x, const time_zone_link& __y) noexcept { |
65 | return __x.name() <=> __y.name(); |
66 | } |
67 | |
68 | } // namespace chrono |
69 | |
70 | # endif // _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && |
71 | // _LIBCPP_HAS_LOCALIZATION |
72 | |
73 | _LIBCPP_END_NAMESPACE_STD |
74 | |
75 | _LIBCPP_POP_MACROS |
76 | |
77 | #endif // _LIBCPP_HAS_EXPERIMENTAL_TZDB |
78 | |
79 | #endif // _LIBCPP___CHRONO_TIME_ZONE_LINK_H |
80 |