I see in the documentation the class positional_options_description  is used to list names for positional options.  But nowhere in the documentation does it say how to pass this to the parser! 

Given the code based on the documentation samples,

 

    po::store(po::parse_command_line(argc,argv,opt),vm);

    po::notify(vm);

 

and

 

       po::positional_options_description pd;

       pd.add("output-file", 2).add("input-file", -1);

 

where do I tell parse_command_line about pd?

 

 

 

 

 

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