Re: [boost] 'indexed' multi arrays?

From: Alec Ross (alec_at_[hidden])
Date: 2007-12-21 07:43:45

In message <476A7273.2000900_at_[hidden]>, Chris Hamilton 
<chamilton_at_[hidden]> writes
>In a recent project I've been working on, we had need for something that
>I'm calling (for lack of a better, more inspired name ;) an 'indexed'
>multi array.  Essentially, we wanted something like a boost multi_array
>but that also allowed indexing along each dimension using some kind of
>indexing function.

This looks interesting to me.

>For example, along one dimension the indexing
>function may except a string as input and use a map to return an integer
> index, while along some other dimension the real line may be cut into
>non-overlapping intervals and a double value is looked up returning the
>index of the interval it belongs to.
>

And this too, in its own right.  How do you deal with the issue of 
limited precision in doubles?  E.g. a value that is a corner case for 
just being in range for one index, or possibly another if these ranges 
are meant to have no 'gap'  (e.g. [d1, d2), [d2, d3))?  Or possibly the 
value used is just in or out of a range, but the relevant epsilon could 
take it either way?

Regards,

Alec
-- 
Alec Ross