On Wed, Oct 17, 2012 at 4:10 AM, Oswin Krause < Oswin.Krause@ruhr-uni-bochum.de> wrote:
Hi,
C++ requires it to be `iterator_traits<Iterator>::**reference`, I
thought, or does it require it to be real reference like `iterator_traits<Iterator>::**value_type&`?
The first is a requirement for every iterator. However, there are a few more lines written in pure standardese which are described in the boost.iterator docu:
http://www.boost.org/doc/libs/**1_51_0/libs/iterator/doc/new-** iter-concepts.html#motivationhttp://www.boost.org/doc/libs/1_51_0/libs/iterator/doc/new-iter-concepts.htm...
"Value Access Requirements in Existing Iterator Categories: [..] Forward Iterator *i is T&"
where T is the value_type of the iterator.
Just to be technically accurate, T const & is also acceptable, of course; but otherwise, yes, a real reference is still technically required by the standard for forward iterators. - Jeff