Re: [boost] [ANN] Boost.Time_series: feedback requested

From: Eric Niebler (eric_at_[hidden])
Date: 2006-12-12 12:54:17

Jeff Garland wrote:
> Eric Niebler wrote:
>> Jeff Garland wrote:
>> Of
>>> course, what I'm thinking is for the stock price rolling average example above 
>>> you might want to use gregorian::date or posix_time::ptime to represent point 
>>> of measurement of the stock price.  I wasn't finding the requirements for the 
>>> offset_type...which is what I think would need to be replaced.
>>
>> Right, I should document the requirements on the offset_type. The code 
>> has been tested with offset_types of int and double. I think the right 
>> concept for offset_type is LessThanComparible.
> 
> Well, here's the thing.  In date-time the 'duration_type' and the 
> 'point_in_time_type' are different.  For example, with dates you have 'date' 
> as the 'point_in_time' which is conceptually dimensionless and the 
> duration_type 'day'.  If you subtract 2 points in time you get a duration. So 
> it's possible there would need to be a different type in the mix to make 
> things work.  Anyway, this will be a good experiment at some point. I'd do it 
> myself if I only had more time.... ;-)

Ah. So the type of (offset - offset) is not the same as the type of 
offset. That's not a problem in theory, but certainly the code doesn't 
handle that situation right now.

Thanks for the feedback.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com