Hi, Maybe sending such a vague email just before the weekend was not such a good idea. What I would like to know is: is it possible to store the extents of a multi_array in a variable? so instead of doing ma = multi_array_ref < int, 3 > ( datapointer, extents[10][10][10] ); is it possible to ex = extents[10][10][10]; ma = multi_array_ref (datapointer, ex ); to be able to support different extents (dimensionalities)? What would be the type of ex in this case? Thanks, Alle Meije Wink On 22 October 2010 16:54, Alle Meije Wink wrote:

Dear all,

I am trying to load data from a file, where they are (obviously) stored as a 1D contiguous block, to a N-dimensional array.

For the type of files I use N could be 1 through 8. I have code to for a 1..8-dimensional container (as a class template), but how to load in the data from the file?

The multi_array_ref way to do it looked ideal, eg for a 3D float-image something like   im = image_ref< float, 2 >( image->data, boost::extents[512][512] ) might work.

But to code the different dimensionalities in a neat way would mean to store the extents in a variable (or something), like

boost_extents_type e; switch ndim { // ndim=dim[0]   1:   int dim1=dim[1];   e=boost::extents[dim1];   break;   2:   int dim1=dim[1],dim2=dim[2];   e=boost::extents[dim1][dim2]; //etc }

Is something like this possible with extents?

Many thanks, Alle Meije