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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT compiler switches and optimization
Date: Mon, 23 Oct 2006 11:02:10 -0400
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Date: 2006-10-23T11:02:10-04:00
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Warner BRUNS <Warner.Bruns@cern.ch> writes:

> A problem with Ada is that the memory layout of multidimensional arrays
> is not specified in the standard. If you want to have the same memory
> layout for all Ada compilers, you have to specify that a multimensional
> array should follow the convention of a foreign language, eg. Fortran.
>    TYPE DefReal IS DIGITS 12;
>    TYPE DefReal2D IS ARRAY(Integer RANGE <>,
>                            Integer RANGE <>) OF DefReal;
>    PRAGMA CONVENTION (Fortran, DefReal2D);

In practise, you can count on the fact that all Ada compilers will
choose row-major order, unless you ask for column-major via the above
pragma, even though the RM does not say so.

> There is something missing in the Ada standard.

Perhaps.

- Bob