Comments (2)
from date.
That's an interesting suggestion. If we were to do it, there's two more difficult things that would need to be done:
- Generalize it to accept any character, and provide a way to parse the character so you could inspect it.
- Standardize it. This library is now an example implementation of C++20
<chrono>
.
The second part we could do after. This library would be the field experience for the proposal. But I wouldn't want to do the field experience without being serious about standardizing it if the field experience is positive.
Here's another way to to parse this pattern. It still requires two calls to parse
, but it can be done by streaming consecutively through the stream:
using TimePoint = date::sys_seconds;
TimePoint
parseISO8601(std::istream& is)
{
date::local_days td;
TimePoint::duration tod;
std::chrono::minutes offset;
is >> date::parse("%F", td);
auto T = static_cast<char>(is.get());
if (T != 'T' && T != ' ')
is.setstate(std::ios::failbit);
is >> date::parse("%T %z", tod, offset);
if (is.fail())
throw std::runtime_error(" ... ");
return TimePoint{(td + tod).time_since_epoch() - offset};
}
My current feeling is that this is clean enough that I'm not motivated to extend the standard (which is a heavy lift).
from date.
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from date.