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NNTP-Posting-Date: Fri, 23 Sep 2005 02:18:21 -0500
From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Constructing an object
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Date: Fri, 23 Sep 2005 02:18:22 -0500
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Date: 2005-09-23T02:18:22-05:00
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>> (I'm aware of the controlled types, but I need to provide parameters for
>> construction, which the special Initialize procedure does not have.)
  Access discriminants let you pass just about anything to the initialize
procedure.  I personally like a Cursor type taking an access discriminant
on the object it's supposed to traverse.  That not only lets the Cursor's
Initialize get needed information, it also enforces a lifetime for the
cursor that's within the lifetime of the traversed object.