Re: [Boost-users] boost::sub_range vs boost::iterator_range

From: Thorsten Ottosen (tottosen_at_[hidden])
Date: 2005-12-07 16:15:57

Victor A. Wagner Jr. wrote:

 >> Seems to me that sub_range is a convenience class to describe 
iterator ranges from ranges or containers that model ForwardRange, from 
which you can propagate constness.
 >
 >
 >
 > yup, that's what I thought also

It seems that the problem was caused by the fact that the vc71
generates default operators a bit wierd.
  The copy-constructor is default generated and so does simply copy the 
iterators. It seems that the default generated constructor/ assignment 
for sub_range calls a templated version of iterator_range's 
construcgtor/ assignment operator

I think this might be a bug in the compiler.

I've added the following overload

         sub_range& operator=( sub_range r )
         {
             //
             // argument passed by value to avoid
             // const_iterator to iterator conversion
             //
             base::operator=( r );
             return *this;
         }

and can now compile your program.

I've also committed this to the main cvs.

-Thorsten