rgamarra <rgamarra@xxxxxxxxx> writes: > To check and see what's going on, I did > > g++ -E main.cc > > , got the full sources and modified the operator- by adding (with the > proper #include <typeinfo>) The operator- you mentioned before is the one for normal_iterator. You can see that it just calls operator- again on the base class. The standard (at least, DR179) requires that operator- accept a combination of iterator and const_iterator. Since this version of operator- is just going to call operator- again, it needs to accept different types in the template. Ian
