[boost] Re: [boost.range] late addition, votes needed

From: David Abrahams (dave_at_[hidden])
Date: 2004-09-15 19:57:02

"Jonathan Turkanis" <technews_at_[hidden]> writes:

> "Doug Gregor" <dgregor_at_[hidden]> wrote in message:
>
>>
>> cbegin()/cend() aren't all that useful unless they also work with the
>> standard library containers. If it's never going to happen for the
>> standard containers, why bother putting it into Boost? Something like
>> "as_const(c)" is a totally different story, of course.
>
> Why can't const_begin be implemented as follows (for standard library
> containers):
>
>      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.
I can't imagine why you'd want this first overload.

>      template<typename Range>
>      typename range_const_iterator<X>::type
>      const_begin(const Range& rng)
>      {
>          return begin(rng);
>      }

That one works.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com