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Date: Sat, 30 Jun 2007 19:54:55 +0200
From: Georg Bauhaus <bauhaus.rm.tsoh@maps.futureapps.de>
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Subject: Re: Bus error
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Date: 2007-06-30T19:51:30+02:00
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Robert A Duff wrote:
> 
> Suppose I say:
> 
>     package P is
>         type Int is range 1..10;
>         type Int_Array is array (...) of Int;
>         ...
>     end P;
> 
> Clients that say "use P;" have visibility on two types, plus all kinds
> of operations on those types (such as "=" on Int_Arrays).
> 
> Now suppose I want a growable array instead:
> 
>     with ...;
>     package P is
>         type Int is range 1..10;
>         package Int_Vectors is new Ada.Containers.Vectors(Int, ...);
>         ...
>     end P;
> 
> Now clients have to say "use P, P.Int_Vectors;" to get visibility on all
> the relevant operations.  Or else P has to rename whole bunch of stuff.

Ah. In these cases I stubbornly place Int and operations in their own
package. When another part of the program needs Int_Vectors in addition
to Int, they are made available in an additional package. Use as needed.
I'll probably write a seemingly artificial abstraction around
Int_Array when I want it to be similar to Int_Vectors.Vector. (But so far
have had no need to do so.)