calc++ example

bison v3.8.2
Win 7/10-x64

Driver.hh has class "driver" defined with scan_begin() and scan_end() 
defined but Driver.cc doesn't have the body for these functions.  Are 
these functions defined?

Also in driver::parse (const std::string &f). "parse.set_debug_level 
(trace_parsing);"  is executed after the parser is executed, shouldn't 
if be executed before the parser executes?

The include file "Parser.hh" has a class called "parser", shouldn't the  
"parse.set_debug_level (trace_parsing);"  be "parser.set_debug_level 
(trace_parsing);"? And where is the body for "set_debug_level 
(trace_parsing);" ?

And in the folder "calc++" there is no parser.hh, parser.cc file, 
scanner.hh or scanner.cc. How can I keep them after the make?

thanks
art