///Generates an EPS file from a graph

 ///\ingroup io_group

 ///This function does the same as

 ///\ref graphToEps(G &g,std::ostream& os)

 ///but it writes its output into the file \c file_name

 ///instead of a stream.

 ///\sa graphToEps(G &g, std::ostream& os)

 template<class G>

 GraphToEps<DefaultGraphToEpsTraits<G> > 

 graphToEps(G &g,const std::string& file_name)

 {

   return GraphToEps<DefaultGraphToEpsTraits<G> >

     (DefaultGraphToEpsTraits<G>(g,*new std::ofstream(file_name.c_str()),true));

 }