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From: "Matthew Heaney" <mheaney@on2.com>
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Subject: Re: Ada Popularity: Comparison of Ada/Charles with C++ STL (and Perl)
Date: Fri, 24 Sep 2004 17:23:40 -0400
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"Randy Brukardt" <randy@rrsoftware.com> wrote in message
news:sOudnSKh7rXbFMncRVn-jg@megapath.net...
>
> (I'm intending an implementation of the containers library that will try
to
> detect dangling cursors, so there will be little chance of building buggy
> code with it.)

Actually, I had wanted to build something similar for AI-302, once the work
on the reference implementation settles down.  There are after-market STLs
like that, and it wouldn't be hard to build a debug-version of AI-302 for
Ada.

All you'd need to do to detect dangling cursors is to implement type Cursor
as a private derivation from Controlled, and then add a reference count to
the internal storage node.  If that element (node) is deleted, then you
could inspect the reference count to see if it's non-zero.