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From: Christoph Grein <christoph.grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: Using controlled types to trace program execution
Date: Wed, 27 Feb 2002 12:55:33 +0100 (MET)
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Date: 2002-02-27T12:55:33+01:00

Dynamic allocation and deallocation are not necessary:

generic

  Unit_Name: String;

package Trace is

private

  X: aliased String := Unit_Name;
  Follower: T (X'Access);

end Trace;

> tmoran@acm.org wrote:
> > 
>    A combination will do the job.
> >   You can't pass a string as a discriminant to your controlled type, and if
> > you pass an access-to-string type it will be a constant and you won't
> > be able to "free" the string.  But you can do it with two levels:
> >   type p is access string;
> >   type t(msg : access p) is new ada.finalization.limited_controlled with ...
> > Then use the generic instantiation as a shorthand for declaring an
> > aliased pointer to a new string'("something") followed by a declaration
> > of the controlled type with a 'access to that pointer as its parameter.
> 
> Thanks - I hadn't thought about declaring a package - only a variable.
> 
> Nige
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