Re: static_cast and const (Was: [boost] Re: [boost.range] late addition, votes needed)

From: Rob Stewart (stewart_at_[hidden])
Date: 2004-09-16 14:20:13

From: "Jonathan Turkanis" <technews_at_[hidden]>
> "David Abrahams" <dave_at_[hidden]> wrote in message
> news:u3c1jhvz5.fsf_at_boost-consulting.com...
> > "Jonathan Turkanis" <technews_at_[hidden]> writes:
> 
> > >      template<typename Range>
> > >      typename range_const_iterator<X>::type
> > >      const_begin(Range& rng)
> > >      {
> > >          return begin(static_cast<const Range&>(rng));
> > >      }
> >
> > For one thing you can't use static_cast to change constness.
> 
> Are you sure? The expression

Yep.  See 5.2.9.  You'll see what static_cast can do, and then
5.2.9/3 specifically excludes any other conversions.  Modifying
cv qualification is not among the things static_cast can do.

-- 
Rob Stewart                           stewart_at_[hidden]
Software Engineer                     http://www.sig.com
Susquehanna International Group, LLP  using std::disclaimer;