Re: [Boost-users] iterator_adaptor usage question

on Sun Mar 11 2012, "Jeffrey Lee Hellrung, Jr." wrote:

On Sun, Mar 11, 2012 at 8:27 PM, John M. Dlugosz wrote:

What is a good way to create both an iterator and a const iterator while only having to specify all my custom behavior once?

Maybe template your iterator on the base iterator, and dispatching when necessary depending on whether that base iterator is the const iterator or the mutable iterator? E.g.,

template< class Base > struct my_iterator     : boost::iterator_adaptor< Base > { };

typedef my_iterator< base_iterator > iterator; typedef my_iterator< base_const_iterator > const_iterator;

http://www.boost.org/doc/libs/1_49_0/libs/iterator/doc/iterator_facade.html#... shows how to do it with iterator_facade, and http://www.boost.org/doc/libs/1_49_0/libs/iterator/doc/iterator_adaptor.html... extends that to iterator_adaptor HTH, -- Dave Abrahams BoostPro Computing http://www.boostpro.com