Re: [boost] Upcoming review of Time Series

From: Eric Niebler (eric_at_[hidden])
Date: 2007-07-31 12:25:42

Hugo Duncan wrote:
>> I think what you want is a piecewise constant series of (value, offset,
>> end offset) tuples like this:
>>
>>    (42, 0, 9)
>>    (43, 9, 21)
>>    (44, 21, 30)
>>    ...
> 
> yes, that is what I am after.  Two observations:
> 
> One inconvenience of this is that I assume it will always be necessary to  
> have the next sample before inserting the current sample (so the end of  
> the run can be specified), though this is not clear to me from the  
> documentation (do I call inserter(42,0) or inserter(42,0,9)?).

The documentation is pretty explicit about this. inserter(42,0) inserts 
a 42 at offset 0 and only at offset 0. See the section "Populating a 
Series": http://tinyurl.com/gbg8u

> And as an inefficiency, each timestamp gets stored twice (again, if I  
> understand correctly).

That is true. It might be useful to define a series type where the end 
of one run is implicitly the beginning of another. Such a series would 
easily fit within the framework. Any ideas what such a thing might be 
called?

For the purposes of genericity, the inserter would still need to accept 
runs in (value, offset, end offset) tuples, though.

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