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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Load an object from a file
Date: Fri, 3 Apr 2009 09:46:02 -0700 (PDT)
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Date: 2009-04-03T09:46:02-07:00
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On Apr 3, 9:08 am, Georg Bauhaus <rm.dash-bauh...@futureapps.de>
wrote:
> Olivier Scalbert schrieb:
>
> > Thanks Ludovic,
>
> > One more question:
>
> > with:
> >     type u2 is new Integer;
> >     type cp_info is new Integer;
>
> >     type Constant_Pool_Array is array (Positive range <>) of cp_info;
> >     type Interfaces_Array is array (Positive range <>) of u2;
>
> Make the index type the same as the type in the disciminant,
> that is, u2.
>
>    type Constant_Pool_Array is array (u2 range <>) of cp_info;
>    type Interfaces_Array is array (u2 range <>) of u2;
>
> since U2 is the type of the discriminants used in providing
> the array bounds.

Or, if you want to keep the "Positive" aspect:

    subtype Positive_U2 is U2 range 1 .. U2'Last;
    type Constant_Pool_Array is array (Positive_U2 range <>) of
cp_info;
    type Interfaces_Array is array (Positive_U2 range <>) of U2;

P.S. You may need to be a bit cautious if you define U2 as a modular
type, as Ludovic suggested, and then use it as the base type of an
unconstrained array.  If you define

    type Some_Array is array (u2 range <>) of u2;

you might be tempted to write code like this:

    procedure Do_Some_Operation (Count : U2) is
       Result : Some_Array (0 .. Count - 1);
       ...

If you call Do_Some_Operation(0), Result is not going to be an empty
array like you expect, but rather an array too large to fit in your
computer, because 0-1 doesn't return a negative number for modular
types but rather a very large positive number.

                              -- Adam