It adds the missing member functions of the tzdb class and adds the free
functions that use these member functions.
Implements parts of:
- P0355 Extending <chrono> to Calendars and Time Zones
This implements the loading of the leap-seconds.list file and store its
contents in the tzdb struct.
This adds the required `leap_seconds` member.
The class leap_seconds is fully implemented including its non-member
functions.
Implements parts of:
- P0355 Extending <chrono> to Calendars and Time Zones
- P1614 The Mothership has Landed
Implements:
- P1981 Rename leap to leap_second
- LWG3359 <chrono> leap second support should allow for negative leap
seconds
- LWG3383 §[time.zone.leap.nonmembers] sys_seconds should be replaced
with seconds
This implements the loading of the tzdata.zi file and store its contents
in the tzdb struct.
This adds all required members except:
- the leap seconds,
- the locate_zone, and
- current_zone.
The class time_zone is incomplete and only contains the parts needed for
storing the parsed data.
The class time_zone_link is fully implemented including its non-member
functions.
Implements parts of:
- P0355 Extending <chrono> to Calendars and Time Zones
- P1614 The Mothership has Landed
Implements:
- P1982 Rename link to time_zone_link
This is the first step to implement time zone support in libc++. This
adds the complete tzdb_list class and a minimal tzdb class. The tzdb
class only contains the version, which is used by reload_tzdb.
Next to these classes it contains documentation and build system support
needed for time zone support. The code depends on the IANA Time Zone
Database, which should be available on the platform used or provided by
the libc++ vendors.
The code is labeled as experimental since there will be ABI breaks
during development; the tzdb class needs to have the standard headers.
Implements parts of:
- P0355 Extending <chrono> to Calendars and Time Zones
Addresses:
- LWG3319 Properly reference specification of IANA time zone database
Reviewed By: #libc, ldionne
Differential Revision: https://reviews.llvm.org/D154282
