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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Container reqs
Date: 20 Oct 2001 12:14:09 +0100
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Date: 2001-10-20T11:14:09+00:00
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lutz@iks-jena.de (Lutz Donnerhacke) writes:

> * Jeffrey Carter wrote:
> >Lutz Donnerhacke wrote:
> >> >By "ordered" I mean a structure where the position of an Element within
> >> >the structure is determined by the value of the Element. What is the next
> >> >Element in the structure if the current Element has moved?
> >> 
> >> Wrong preconditions. You talk about arrays, but even those needs not to be
> >> counted continously. Example:
> >
> >No, I didn't mention arrays. I'm talking about iterating over an ordered
> >data structure. Some action is applied to the current Element, then to
> >the next Element, where "next" is defined by the structure.
> 
> Exactly. Where is the problem with changing the underlying structure while
> iterating? Databases offer serveral isolation levels for this.

If you need a database, use a database! All the component libraries
I'm aware of are intended to be used for in-memory data structures and
are fairly light-weight.

What would the Java collections classes do under such circumstances?