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From: danmcleran@hotmail.com
Newsgroups: comp.lang.ada
Subject: Re: Possible Ada deficiency?
Date: 24 Jan 2005 09:23:01 -0800
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Date: 2005-01-24T09:23:01-08:00
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> Wrapping the type in a nested package can be used to
> accomplish approximately what you need.

What I wanted was a way to prevent child packages from messing with
certain areas of a parent package. Using Tucker's suggestion, I put my
type implementation into a nested package. I believe that this will
prevent any other component, including child packages, from messing
with Secret_Value directly. Here's what I've come up with:

package Some_Package is
package Some_Package_Implementation_Package is
type Some_Type is limited private;

procedure Set_Secret_Value (
Obj : in out Some_Type;
New_Value : in Integer);

function Get_Secret_Value (Obj : in Some_Type) return Integer;

private
type Some_Type is record
Secret_Value : Integer := Integer'First;
end record;
end Some_Package_Implementation_Package;

subtype Some_Type is Some_Package_Implementation_Package.Some_Type;

procedure Set_Secret_Value (
Obj : in out Some_Type;
New_Value : in Integer) renames
Some_Package_Implementation_Package.Set_Secret_Value;

function Get_Secret_Value (Obj : in Some_Type) return Integer
renames Some_Package_Implementation_Package.Get_Secret_Value;
end Some_Package;