* 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"
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