On Thu, May 23, 2013 at 2:26 AM, Fidel Pérez <[email protected]> wrote:

> I have spent some time trying to make a function to loop through nodes
> inserting childs, and after that I understand some of the reasons why
> looping through nodes is so difficult. My conclusions are:
>
> - Since the position "p" of a node, right now, offers no more information
> than the position on a tree which will disappear if the tree changes, we
> might as well set the position value to be the actual numbered position
> that node occupies in the tree.
>

This is an interesting idea, but there is no way I'm going to change the
position class as you suggest, for at least the following reasons:

1. The position class appears everywhere in the code.  It's way too late to
change it significantly.

2. Rather than silently changing the meaning of a position index, we want
to know whether p.exists().  Changing the meaning of a position silently is
asking for chaos.  Changed positions would be time bombs.

3. The position class already has various ways of describing nodes using
indices.  See p.archivedPosition and p.key.

Edward

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