Re: [Boost-users] [program_options] unknown positional option

Subject: Re: [Boost-users] [program_options] unknown positional option
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2010-08-05 00:21:21

Jeffrey Finkelstein wrote:

> I'm having some trouble using the program_options library.
> 
> Here is some code slightly modified from an example in the documentation for
> boost::program_options.
> 
> <code>
> #include <iostream>
> #include <vector>
> #include <string>
> #include <boost/program_options/positional_options.hpp>
> #include <boost/program_options/variables_map.hpp>
> #include <boost/program_options/parsers.hpp>
> 
> namespace po = boost::program_options;
> 
> int main(int argc, char ** argv) {
> 
>   po::positional_options_description desc;
>   desc.add("files", -1);
>   std::cout << "Declared positional options." << std::endl;
> 
>   po::variables_map vm;
>   po::store(po::command_line_parser(argc, argv).positional(desc).run(), vm);

positional_options_description merely specifies translation from position to
option names. For example, the above say that every positional element of the
command line is a value of an option named 'files'. However, such option still
have to be declared in a regular way.

- Volodya