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From: mheaney@on2.com (Matthew Heaney)
Newsgroups: comp.lang.ada
Subject: Re: Booch: missing r/w access through iterators
Date: 8 Nov 2002 12:53:09 -0800
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porton@ex-code.com (Victor Porton) wrote in message news:<3dcb4b43$0$307$bed64819@news.gradwell.net>...
> 
> So, if you insist on not aliased container items in general, you 
> however can (and please do so):
> 
> 1. Add procedure to assign a value to the current item:
> 
> procedure Assign_Current_Item (It : Iterator; Value : Item) is abstract;
> -- Alternatively it can be not abstract but using Iterator_Operations
> -- (see below).

The Charles library already has this operation:

   procedure Replace_Element 
     (Iterator : Iterator_Type;
      Item     : Element_Type);

However, getting a copy of the element out of the container, modifying
the copy, and then replacing the element with the value of the copy is
probably not as efficient as simply modifying the element in place, as
I have illustrated in previous posts.

Charles is available at my home page:

http://home.earthlink.net/~matthewjheaney/charles/index.html