Re: [Boost-users] boost solution for transforming stl algorithms on proxy iterators?

Subject: Re: [Boost-users] boost solution for transforming stl algorithms on proxy iterators?
From: Oswin Krause (Oswin.Krause_at_[hidden])
Date: 2012-10-17 07:10:10

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#motivation

"Value Access Requirements in Existing Iterator Categories:
[..]
Forward Iterator 	*i is T&"

where T is the value_type of the iterator.

Greetings,
Oswin