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

Subject: [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 03:39:17

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