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

Subject: Re: [boost] [iterator] could non-small predicates/functors be stored as boost::optional<T> to avoid double construction?
From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2008-09-04 14:18:14

David Abrahams skrev:
> on Thu Sep 04 2008, Thorsten Ottosen <thorsten.ottosen-AT-dezide.com> wrote:
> 
>> Arno Schödl skrev:
>>>> Hi,
>>>> 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?
>>>> best regards
>>>> -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

Yes. Sorry for the noise.

-Thorsten