yyscan_t scanner;
    yyset_extra(this, &scanner);
    while ( !fileStream.eof() ) {
        char line[256];
        fileStream.getline(line, 256);

        /* FLEX COMES HERE */
        YY_BUFFER_STATE bp;
        bp = yy_scan_string(line, scanner);
        yy_switch_to_buffer(bp, scanner);
        /* the int value of the token returned by yylex() is stored in r */
        int r;
        do {
            r = yylex( scanner );
            std::cout << std::endl << "Rv: " << r << std::endl << std::endl;
        } while ( r != 0 );
        yy_delete_buffer(bp, scanner);
        yylex_destroy( scanner );

    }