Re: [boost] Iterator adaptor question

From: Thomas Witt (witt_at_[hidden])
Date: 2003-08-06 14:06:42

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Rozental, Gennadiy wrote:

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|>Rozental, Gennadiy wrote:
|>
|>| What is the problem adapting pair of iterators to scalar vectors to
|>produce
|>| an iterator with complex value type?
|>
|>The problem is you can hardly adapt a pair. So using
|>iterator_adaptor (the new class template) does not provide
|>any benefit.
|
|
| Why is that?

The whole point in adapting is that you modify some but not all
behaviour/interface of a thing. Ther is nothing a pair provides that can
be reused so adaption is pointless.

That's why the new version provides iterator_facade and
iterator_adaptor. iterator_facade helps with implementing iterators,
iterator_adaptor is for adapting iterator like types.

| I did not look in depth on new version but I remember that old
| one allowed to adapt any source.

You needed to do this as the iterator interface implementation was not
seperated from the actual iterator_adaption.

Thomas

- --
Dipl.-Ing. Thomas Witt
Institut fuer Verkehrswesen, Eisenbahnbau und -betrieb, Universitaet
Hannover
voice: [phone] - 4273, fax: [phone]
http://www.ive.uni-hannover.de
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