RE: [boost] Re: Constructor of iterator_adaptor takes parameter by value

From: Hartmut Kaiser (hartmutkaiser_at_[hidden])
Date: 2004-01-09 10:36:51

David Abrahams wrote:

> > You're right, but IMHO this is a complete different situation. The 
> > iterator adaptor constructor copies the iterator parameter 
> anyway into 
> > the own m_iterator member, so further working of the 
> iterator_adaptor 
> > does not rely on a reference as would do the algorithms, if they'd 
> > take references. Taking the iterator parameter by const reference 
> > simply would avoid one additional copy operation, which may 
> be costly for more complex iterators.
> 
> The only thing that gives me pause are Andrei's findings here:
> 
> http://thread.gmane.org/gmane.comp.lib.boost.devel/9616
> 
> Are they inapplicable in this case?

Completely relying on MOJO or similar techniques would require, that I'm
able/allowed to _modify_ the base iterator code, which isn't always true.

Regards Hartmut