Re: [Boost-users] [foreach] reverse foreach?

8 Mar 2006


      "Andy Little"  writes:
...
FWIW Heres some sample code. Its seems a bit lopsided!
std::ofstream out("toolpath_out.txt");
BOOST_FOREACH(boost::shared_ptr<section> sp,vect){
if (sp->m_action == section::reverse){
           for( std::vectorstd::string::reverse_iterator iter
                = sp->m_vector.rbegin();
                    iter != sp->m_vector.rend();
                        ++iter){
                out << *iter << '\n';
            }
        }
        else {
            BOOST_FOREACH(std::string str,sp->m_vector){
                out << str << '\n';
            }
        }
    }
Are there any plans for a BOOST_REVERSE_FOREACH?
I suggest you just make a nice reverse adaptor that models Range,
wrapping the underlying iterators in boost::reverse_iterator, and an
object generator that builds instances.  Then you can

   BOOST_FOREACH( whatever, reverse_view( the_sequence ) )
      ...

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com

Re: [Boost-users] [foreach] reverse foreach?

David Abrahams