Re: [boost] [multi_array] Slices, views and sub_arrays

Subject: Re: [boost] [multi_array] Slices, views and sub_arrays
From: Ronald Garcia (garcia_at_[hidden])
Date: 2008-10-10 19:05:28

Hi Rob,

Yes, the return type of indexing a view is a subarray.  However,  
subarrays don't copy the data in an array.  Think of a subarray as  
just a special case of view.

cheers,
ron

On Oct 10, 2008, at 5:12 AM, Robert Jones wrote:

> Hi All
>
> I'm still plugging away at trying to make use of multi_array, but I
> seem to be having a few problems! I suspect my understanding
> of the basic paradigm is flawed.
>
> I'm bit confused about views and slices. If I start with a  
> rectangular,
> 2 dimensional grid, take a view of the whole grid, and then use a
> single subscript to index into that view, then I expected the result
> to be a view of one less dimension then the original view. However,
> it seems to be a "sub_array".
>
> which seems to confirm I've got all my consts and dimensions correct.
>
> So, why is this wrong?
>
> Also, does the return type of sub_array, rather than array_view,  
> mean that
> the contents
> of the relevant cells have been copied?
>
> Thanks
>
> - Rob.
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