[boost] [range] No iterator_range::const_reference

From: Francois Barel (frabar666_at_[hidden])
Date: 2008-08-21 13:59:54

Hi list,

boost::iterator_range currently contains both 'iterator' and
'reference' typedefs, and yet only a 'const_iterator' one (no
'const_reference').

This can be a problem with Spirit actions (compilation errors, see
trac ticket #2234 - http://svn.boost.org/trac/boost/ticket/2234).
After removing Spirit code, it boils down to:

////////////////////
#include <boost/spirit/include/phoenix_stl.hpp>
#include <boost/range/iterator_range.hpp>

int main()
{
    typedef const boost::iterator_range< const char* > cir;
    boost::phoenix::stl::front::result< cir > foo;  // compilation error
    return 0;
}
////////////////////

The problem comes from the instantiation of
    boost::phoenix::stl::front::result< const iterator_range<...> >
which, since its template argument is const, accesses its
const_reference typedef -- which doesn't exist in iterator_range.

Does it make sense / is it possible to add a const_reference typedef
in iterator_range?

Thanks,
Francois