* Remove arithmetic overflow:
Using operator '-' on a 4 byte value and then casting the result to a 8 byte value. Casting the value to the wider type before calling operator '-' to avoid overflow.
Build fails with Intel Compiler v16:
<source>(1698): error: expression must have a constant value
std::is_class<typename std::decay<decltype(*std::declval<TimeZonePtr&>())>::type>{}
^
The NVCC compiler fails to compile the date library due
to a compiler bug which causes it to emit an error when
directly using std::ratio_{multiply,divide} in the template
instantiations for std::duration. This PR works around the
issue by introducing custom ratio_{multiply,divide} which
delegate to the standard library templates
Added OnlyLValueString test case that shows the problem with
current impl. Implemented the change, that accept TimeZonePtrOrName
by forwarding reference (to preserve value category), and
merged time_zone selection into one trait.
The GCC 8 was correctly preffering the deduction guide
syntezied from the std::string_view constructor which is more
specialized than deduction guide. Changed the constructor
so the Duration cannot be deduced from it.
This is done to make the result of calling day() on
year_month_day_last object that is !ok() unspecified.
Checked only months, are there are needed to avoid UB.
Added some flexibility for usage of std::uncaught_exceptions().
Xcode 10 uses clang and perfectly compiles C++17, but
std::uncaught_exceptions() is available only on iOS 10+ devices. When
application supports iOS 9 devices and uses C++17 there is no way to
build it, except drop iOS 9 support or remove C++17 code. Using this
define we could configure should date.h use std::uncaught_exceptions()
or not.
- c_encoding satisfies ctime wday encoding: days since Sunday, range
[0,6]
- iso_encoding satisfies ISO 8601 weekday:
a digit d from 1 through 7, beginning with Monday and ending with Sunday
* These flags format a duration.
* %Q specifies the duration's numeric value.
* %q specifies the duration's SI abbreviation.
* Example: format("%Q %q", 45ms) == "45 ms"
'using namespace std;' in header files can conflict with custom
namespace names. For example 'string' is used without 'std::'
qualification. If tz.h is included in a file where string is a
namespace, it cannot be compiled anymore. The same happens with date.h
if ONLY_C_LOCALE=1.
Implemented clock_time_conversion<D, local_t> calling D::from_local
and clock_time_conversion<locat_t, S> calling S::to_local.
To avoid ambiguities addes:
* clock_time_conversion<local_t, local_t> - idenitity
* clock_time_conversion<local_t, utc_clock> - same as default (utc_clock::to_local)
* clock_time_conversion<utc_clock, local_t> - same as default (utc_clock::from_local)
In addition, as std::chrono::system_clock cannot be edited, added:
* clock_time_conversion<local_t, std::chrono::system_clock> - assumes same epoch
* clock_time_conversion<std::chrono::system_clock, local_t> - assumes same epoch
They will be required to resolve amibiguity anyway.
Implemented to_local and from_local functions for utc_clock,
tai_clock and gps_clock. For the tai/gps clock used this function
for defining the io - we delegate to serializing/parsing local
time.
The drwaback is that the local_time cannot properly represent
leap second in the UTC time, so separate serialization is needed.
* There has been a great deal of anguish over the encoding of
weekdays: whether [0, 6] maps to [Sunday, Saturday] or
[1, 7] maps to [Monday, Sunday]. This commit attempts
to address that issue, but will break a small amount of
code at compile-time. See below on how to fix that.
* The weekday constructor used to accept [0, 6] to represent
[Sunday, Saturday]. It now accepts [0, 7] to represent
[Sunday, Saturday] with both 0 and 7 mapping to Sunday.
* The conversion from weekday to unsigned has been removed.
* To convert a weekday to unsigned replace:
auto u = unsigned{wd};
with:
auto u = (wd - Sunday).count();
This maps [Sunday, Saturday] to [0, 6], which is the
C/POSIX mapping. If you prefer the ISO mapping
([Monday, Sunday] -> [1, 7]), then do:
auto u = (wd - Monday).count() + 1;
* Added new overloads for operator+/- between year_month and duration
that is convertible to years, so it is better candidate for operands
that are convertible to both years and months. To preserve
functionality, this operator is conditionally noexcept.
* Reworked year_month_day, year_month_day_last, year_month_weekday,
and year_month_weekday_last.
* Added tests for this new functionality.
* to_stream and from_stream now reset the stream formatting state to
default settings on entry, and restore the stream state on exit.
* to_stream and from_stream now correctly handle mis-modified flags.
* Fix %h to be equivalent to %b instead of %B.
* This addresses issues 319, 320 and 321.
* The standardized version of this library has std::chrono::January
and std::chrono::Sunday in place of std::chrono_literals::jan and
std::chrono_literals::sun. Compatible names added to namespace
date to ease transition from this lib to std::chrono. The old
names are retained for backwards compatibility.
