slicing bidimensional arrays

slicing bidimensional arrays

[amado.alves]

I want to slice a bidimensional array. Or extract/view a row thereof
as a unidimensional array (of the same component type of course). This
is illegal in Ada. So I am designing a slicer/extractor/viewer
subprogram. The arrays can be large, so I want to approximate the
efficiency of view conversions. I'd appreciate confirmation/
infirmation of the following premises.

The internal representation of a bidimensional array is one row after
the other sans separators.
This representation equates that of a unidimensional array (of the
same component type).
All this excluding the range information of course, i.e. looking only
at the data part.
So we can safely (unchecked?) convert between the two array types.

Thanks a lot.

Re: slicing bidimensional arrays

[Brian Drummond]

On Fri, 8 Aug 2008 08:26:42 -0700 (PDT), amado.alves@gmail.com wrote:

>I want to slice a bidimensional array. Or extract/view a row thereof
>as a unidimensional array (of the same component type of course). This
>is illegal in Ada. 

Barnes ("Programming in Ada 2005") discusses some interesting
possibilities for slicing - not using a 2-D array, but an array of
arrays. The array can be sliced; as can each individual array. I don't
know if this would help in your situation, but it is another tool in the
box.

- Brian