[Lazarus] How to iterate through a TAvgLvlTree

Mattias Gaertner nc-gaertnma at netcologne.de
Fri Mar 16 11:06:49 CET 2012

On Fri, 16 Mar 2012 20:47:15 +1100
Alexander Klenin <klenin at gmail.com> wrote:

> On Fri, Mar 16, 2012 at 19:36, Mattias Gaertner
> <nc-gaertnma at netcologne.de> wrote:
> >> Is it possible to iterate through all items in a TAvgLvlTree? I
> >> couldn't find an easy method for doing that.
> >
> > for Node in Tree do
> By the way, I think you are using TAvgLvlTree rather often,
> so did you ever wanted another traversal order besides the default one?

Of course.

> You replaced my proposal of extending the for..in loop on the wiki
> by an example implementing it using the current syntax.
> So, I am interested -- did you actually use you implementation?


> What is your opinion -- did it work well for you?


> In particular, I am interested in the memory management issues --
> how is enumerator instance freed in your example?

If you mean the fpc enumerators: They are freed by compiler magic after
the loop.

> Finally, do you feel the need for the remaining extension proposal --
> namely, getting the index from enumerator?

An index is hardly needed for an AVL tree.


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