Re: [boost] [chrono/date] Performance goals and design summary

On May 5, 2013, at 7:39 PM, Rob Stewart wrote:

On May 5, 2013, at 7:33 PM, Howard Hinnant wrote:

...

On May 5, 2013, at 2:45 PM, Vicente J. Botet Escriba wrote:

One possibility (untested) would be to make calculate_year a namespace scope function with the following default implementation:

year calculate_year(ymd_field_type ymd) {return ymd.year();}

So if the serial date will implicitly convert to ymd_filed_type, then you can say:

if (ymdTargetDate.month() == calculate_month(date))

And if an implementation thinks they can do better than that then they can overload calculate_xxx(serial_type). This is very analogous to how we currently handle swap.

Agreed it would be nice to find a better (shorter) name, but one hasn't immediately come to mind.

get_month?

I thought about that. And that may be best. But someone is going to ask: Why can't I do this: serial_date x = ... set_month(x, dec); We could just say, sorry, that doesn't make sense. But the nice thing about calculate_month, or compute_month, is that the reader will intuitively understand that this isn't necessarily a reversible computation. I.e. get implies returning the value of a field, and it would be nice to not imply that. On the plus side, get_month is lot easier to type! Howard