Re: [boost] [iterator] could non-small predicates/functors be stored as boost::optional<T> to avoid double construction?

on Thu Sep 04 2008, Thorsten Ottosen <thorsten.ottosen-AT-dezide.com> wrote:

Arno Schödl skrev:

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Hi,

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The headline pretty much says it all. Take transform iterator. When the predicate is not trivial, we also have a redundant construction of the object in the end iterator. Maybe that could be removed?

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best regards

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-Thorsten

I guess that would be restricted to forward iterators.

This has nothing to do with the wrapped iterator's type. A transform iterator currently stores a functor by value in addition to the wrapped iterator.

Have you forgotten *--end ? -- Dave Abrahams BoostPro Computing http://www.boostpro.com