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From: Stephen Leake <Stephen.Leake@gsfc.nasa.gov>
Subject: Re: Help on arrays of tagged types
Date: 1998/01/09
Message-ID: <34B66513.11D@gsfc.nasa.gov>#1/1
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Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA
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Date: 1998-01-09T00:00:00+00:00
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mrada wrote:
> 
> Hi all,
> 
> I am racking my brains trying to figure out how to have a hetergenous
> array of tagged type data.  I have numerous packages all of which have
> a Data type inherited from one another.  I would like to declare an
> array who components can point to different "Data" type objects.
	                    ^^^
key word; "point". Use an array of class-wide access type;

type Root_Type is abstract tagged with null record;
type Root_Access_Type is access Root_Type'class;

type Heterogenous_Array_Type is array (foo) of Root_Access_Type;

Yes, this requires allocate/deallocate; that's the price you pay for
flexibility.

If the array elements are constant, they can be staticly declared,
avoiding allocate/deallocate.


> Chris Sparks

-- 
- Stephe