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