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Date: Sat, 26 Jun 2004 12:16:06 -0400
From: "Robert I. Eachus" <rieachus@comcast.net>
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Subject: Re: memory management and productivity
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Date: 2004-06-26T12:16:06-04:00
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Russ wrote:

> Having it as a library is fine with me -- as long as the library is
> *standard* and available with every Ada compiler (or at least the main
> free one).

If you want, I write you a generic library for Ada 95 that does garbage 
collection.  All you need to do is wrap Ada.Strings.Unbounded_String in 
a generic along with Unchecked_Conversion.

I've never bothered to do it because the cases where I used the 
technique, it was better to have a non-generic binding.  (Slices of 
arrays created as intermediate values.  Slicing two dimensional arrays 
was most of the work, not the garbage management.)

Incidently, the 'fragile' part of that code is not the garbage 
collection, it is deciding what the lifetime of a particular slice needs 
to be.  If you make the lifetime too short, you either have code that 
won't compile or get an exception during testing. If you make the scope 
too long, you run out of storage.  (And yes, the liftime of the object 
is determined by where it is declared, it is getting those declarations 
in the right place that is difficult.)

-- 

                                           Robert I. Eachus

"Reason and experience both forbid us to expect that national morality 
can prevail in exclusion of religious principles." -- George Washington