RE: [boost] iterator_adaptors.hpp/transform_iterator

From: Jeremy Siek (jsiek_at_[hidden])
Date: 2001-03-27 12:16:05

You can see my most recent version of the proposal here:

http://www.lsc.nd.edu/~jsiek/iterator-categories.html

and there's slightly out-of-date code in boost/development/iterator for
the new iterator traits classes.

Like I've been saying... I think we need to move ahead on this fairly
soon. The need for this from VTL makes this even more obvious.

Once we agree on the new iterator concepts, it should not be hard to
update iterator_adaptor to use them.

Cheers,
Jeremy

On Tue, 27 Mar 2001, John E. Potter wrote:
jpotte> 
jpotte> > However when we were constructing view policies dependent on the iterator
jpotte> > type, I came across this problem, and that is, transform_iterator_generator
jpotte> > specifies that iterator_adaptor has as an iterator tag type,
jpotte> > "std::input_iterator_tag"
jpotte> > 
jpotte> > VTL really needs this to be whatever the tag of the class Iterator that is
jpotte> > passed in as a template argument. As in
jpotte> > std::iterator_traits<Iterator>::iterator_category
jpotte> > 
jpotte> > Is there a reason it's only a std::input_iterator_tag?
jpotte> 
jpotte> The only std::iterator with value semantics is input_iterator.  All of the
jpotte> others have reference semantics.
jpotte> 
jpotte> See Jeremy's recent proposal to change to two traits so that increment
jpotte> and dereference can be independently specified.
jpotte> 
jpotte> John
jpotte> 
jpotte> 
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jpotte> 

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 Jeremy Siek                        www: http://www.lsc.nd.edu/~jsiek/
 Ph.D. Candidate                  email: jsiek_at_[hidden]
 Univ. of Notre Dame         work phone: [phone]
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