From: David Abrahams (dave_at_[hidden])
Date: 2005-06-15 11:01:27
Jonathan Wakely <cow_at_[hidden]> writes:
> On Wed, Jun 15, 2005 at 10:24:10AM +0200, Thorsten Ottosen wrote:
>> "David Abrahams" <dave_at_[hidden]> wrote in message
>> | If someone would clearly and succinctly spell out the question, I'd be
>> | happy to.
>> should one be able to add, subtract, and compare mutable random access
>> iterators with
>> random access const_iterators provided they point to the same container?
> It's not required for any iterator in general (you can't convert all
> output iterators to input iterators, for instance ostream_iterator
> cannot be converted to a read-only iterator type).
> But the container requirements require that X::iterator be convertible
> to X::const_iterator, and then all those operations work by using that
That's incorrect. For example, if the operations are templated no
implicit conversion will take place.
-- Dave Abrahams Boost Consulting www.boost-consulting.com
Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk