Re: [multi] Formal Review Begins

On 3/12/26 17:02, Ruben Perez via Boost wrote:
> * Subarrays and array references are not copyable. This is unusual,
> since all reference
>    types I know of (span, mdspan, string_view, url_view,
> mysql::rows_view) are copyable.
>    It looks like the library tries to make the type appear like a reference, but
>    I don't think that's wise - exotic references are not language references,
>    no matter how hard you try.
>    I would make subarrays copyable to avoid surprises.

I would agree, except that this would actually break some major uses of 
subarrays.  For example:

   multi::array<int, 2> a({5, 5}), b({5, 5});
   a({0, 2}, {0, 2}) = b({0, 2}, {0, 2});

This copies a 2×2 square from one array to another array.  a's 
operator() returns a subarray.  b's operator() returns another subarray. 
  The first subarray's operator= copies the data from b to a.  This can 
only work if subarray::operator= copies the actual data instead of 
changing the array the subarray refers to.


-- 
Rainer Deyke - [email protected]

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