* Qu: 3D unconstrained arrays
@ 1995-02-08 22:57 Randy Binnie
1995-02-09 1:40 ` Kent Mitchell
1995-02-10 4:20 ` Michael Feldman
0 siblings, 2 replies; 3+ messages in thread
From: Randy Binnie @ 1995-02-08 22:57 UTC (permalink / raw)
Hi, Assuming this news group allows non political postings, I have an
Ada implementation question???
How can one create a 3 dimensional unconstrained array made up of a one
dimensional unconstrained array and a two dimensional unconstrained array.
Ideally I would like to do the following, but it is not allowed because the
type ARRAY_2D_TYPE is unconstrained.
type ARRAY_2D_TYPE is array ( range <>, range <>) of DATA_TYPE;
type ARRAY_3D_TYPE is array ( range <>) of ARRAY_2D_TYPE;
I could do it by creating access pointers to the 2-D array type such as
type ARRAY_2D_TYPE is array ( range <>, range <>) of DATA_TYPE;
type ACCESS_2D_TYPE is access ARRAY_2D_TYPE;
type ARRAY_3D_TYPE is array ( range <>) of ACCESS_2D_TYPE;
but I would prefer a cleaner solution using a single monolithic 3 dimensional
data structure. So my question is can it be done, if so a brief explaination
would be appreciated. This is for an Ada '83 compiler.
Thanks for any feedback you may have.
--
-----------------------------------------------------
Randy Binnie FlightSafety International
Broken Arrow, Oklahoma 74012
randyb@ssd.fsi.com 918-251-0500 ext. 464
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Qu: 3D unconstrained arrays
1995-02-08 22:57 Qu: 3D unconstrained arrays Randy Binnie
@ 1995-02-09 1:40 ` Kent Mitchell
1995-02-10 4:20 ` Michael Feldman
1 sibling, 0 replies; 3+ messages in thread
From: Kent Mitchell @ 1995-02-09 1:40 UTC (permalink / raw)
Randy Binnie (randyb@ssd.fsi.com) wrote:
: Hi, Assuming this news group allows non political postings, I have an
: Ada implementation question???
We always accept non-political postings. In fact we prefer them but some
times ....
: How can one create a 3 dimensional unconstrained array made up of a one
: dimensional unconstrained array and a two dimensional unconstrained array.
: Ideally I would like to do the following, but it is not allowed because the
: type ARRAY_2D_TYPE is unconstrained.
: type ARRAY_2D_TYPE is array ( range <>, range <>) of DATA_TYPE;
: type ARRAY_3D_TYPE is array ( range <>) of ARRAY_2D_TYPE;
This exact structure is not possible so you can't create what you describe
above (a two dimensional unconstrained array containing a one dimensional
unconstrained array). However, see below to create what you want as you
cleaner solution.
: but I would prefer a cleaner solution using a single monolithic 3 dimensional
: data structure. So my question is can it be done, if so a brief explaination
: would be appreciated. This is for an Ada '83 compiler.
A monolithic 3d array is declared as:
type Array_3D_Type is
array (Positive range <>, Positive range <>, Positive range <>)
of Data_Type;
Note: I had to add a type for the range <>. I picked positive but any
discrete type will do.
--
Kent Mitchell | One possible reason that things aren't
Technical Consultant | going according to plan is .....
Rational Software Corporation | that there never *was* a plan!
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Qu: 3D unconstrained arrays
1995-02-08 22:57 Qu: 3D unconstrained arrays Randy Binnie
1995-02-09 1:40 ` Kent Mitchell
@ 1995-02-10 4:20 ` Michael Feldman
1 sibling, 0 replies; 3+ messages in thread
From: Michael Feldman @ 1995-02-10 4:20 UTC (permalink / raw)
In article <RANDYB.95Feb8165716@oh58d-pdssc.ssd.fsi.com>,
Randy Binnie <randyb@ssd.fsi.com> wrote:
>
>Hi, Assuming this news group allows non political postings, I have an
>Ada implementation question???
Yeah, technical questions are allowed, though sometimes it's hard to tell!
>
>How can one create a 3 dimensional unconstrained array made up of a one
>dimensional unconstrained array and a two dimensional unconstrained array.
It's not clear to me why a regular ol' 3-dimensional array type is not OK.
Why not do it the simple way, like
TYPE 3DArray IS ARRAY (Foo RANGE <>, Bar RANGE <>, Glurk RANGE <>)
OF DataType;
Perhaps you didn't describe the problem fully.
Mike Feldman
------------------------------------------------------------------------
Michael B. Feldman - chair, SIGAda Education Working Group
Professor, Dept. of Electrical Engineering and Computer Science
The George Washington University - Washington, DC 20052 USA
202-994-5919 (voice) - 202-994-0227 (fax) - mfeldman@seas.gwu.edu (Internet)
------------------------------------------------------------------------
One, two, three ways an underdog: Ada fan, Mac fan, Old Liberal Democrat
------------------------------------------------------------------------
Ada on the World-Wide Web: http://lglwww.epfl.ch/Ada/
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1995-02-09 1:40 ` Kent Mitchell
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