Re: [Boost-users] multi_array: creating a view to a single element

From: Sohail Somani (s.somani_at_[hidden])
Date: 2006-06-29 18:10:34

> -----Original Message-----
> From: boost-users-bounces_at_[hidden] 
> [mailto:boost-users-bounces_at_[hidden]] On Behalf Of 
> Cromwell Enage
> 
> > Would T & center = element[3][3] be satisfactory?
> 
> Try:
> 
> typename boost::multi_array<T,2>::index
>    index1 = (element.index_bases()[0]
>           + element.strides()[0]) / 2;
> typename boost::multi_array<T,2>::index
>    index2 = element.index_bases()[1];
>           + element.strides()[1]) / 2;
> T& center = element[index1][index2];

To make it general, yes.

> > I don't think multiarray supports any type of
> > reallocation after construction, so it should
> > be ok.
> 
> boost::multi_array has a resize() function, if that's
> what you're afraid of.  See
> <http://www.boost.org/libs/multi_array/doc/reference.html>

In this case, obviously center would not be center anymore, so the OP
should beware.