On 5 May 2015 at 16:28, Fabio Tordini wrote: | Here is the actual (simple) code: | | Finder *f = new Finder(); | f->parseFiles(str_g, str_f, str_s); So where is Finder implemented? The computer tells you that you want to use it, but don't supply it. Dirk -- http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org