Re: [boost] [range] calling front() on iterator_range of const elements

From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2006-06-06 18:35:19

Valentin Samko wrote:
> Is it intentional that one can not call range.front() on an iterator
> range of const values?
> 
>         #include <boost/range/iterator_range.hpp>
>         int main() {
>                 typedef const char* iterator;
>                 iterator p = "test";
>                 boost::iterator_range<iterator> range(p, p+1);
>                 range.front();
>         }
> 
> This fails to compile as
>         value_type& front() const { ... return *m_Begin; }
>         in iterator_range.hpp
> tries to bind a const char lvalue to a non const reference.
> 
> The same happens with back() and operator[].
> 
> The fix is to return
>         typename std::iterator_traits<IteratorT>::reference
> and not
>         value_type&

I believe this is fixed in cvs and rc_1.34 branch.

-Thorsten