[Boost-users] filter iostreams

Hello I'm having difficulties understanding some concepts of iostream filters. What I want to do? I want to have a filter (filter/line.hpp) that will split input (file) to lines. I've looked at class example but I still dont know how to use it for input (source) file. When I put filter on source stream, what is the best way to read it? I noticed most of examples use std::getline which gets line by default, but I decided to go for boost iostreams line filter because I thought it would be faster than getline approach.. Is this wrong? If not, how should I read file using line filter stream to get best preformance? Thanks for help