RE: [boost] Re: New Iterator Adaptors

From: Hartmut Kaiser (hartmutkaiser_at_[hidden])
Date: 2003-06-11 01:11:36

David Abrahams wrote:

> > As a last resort this certainly helps. And in a year or so 
> nobody will 
> > talk about the transitional CVS versions. But now it would be very 
> > helpful, if there was a separate BOOST_ITERATOR_ADAPTOR_VERSION pp 
> > constant, which could be used for this needs (BTW Spirit has such a 
> > constant from the early beginnings). Please don't get me 
> wrong, I do 
> > not want to have a very fine granulated version tracking 
> constant. My 
> > point is, that such interface breaking changes _must_ be track-able.
> 
> Well, here are the problems:
> 
>     1. There's no definition of this macro in the current sources
> 
>     2. The new iterator adaptors don't use the same file paths,
>        e.g. boost/iterator/iterator_adaptor.hpp vs
>        boost/iterator_adaptors.hpp.
> 
> I'm certainly open to any concrete solutions to this problem. 
>  Just tell me how to do it.

Hmmm... You're removed the boost/iterator_adaptors.hpp file
intentionally, right? This makes it even more problematic, because,
there is no chance to circumvent compilation errors.
What about re-introducing the boost/iterator_adaptors.hpp file:

#define BOOST_ITERATOR_ADAPTOR_VERSION 0x2000
#include <boost/iterator/iterator_adaptor.hpp>

This would allow for some version tracking and a smooth migration path
for those libraries, willing to support both, the new _and_ the old
iterator libs. Thought's?

Regards Hartmut