Re: [Boost-users] [program_options] multitoken

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-04-24 04:52:17

Nathan LeZotte wrote:

> I believe this functionality is built right in to the program_options
> library if you use value< vector<T> > as your value semantic.  There
> is an example of this in the "Getting Started" section of the
> program_options documentation
> (http://www.boost.org/doc/html/program_options/tutorial.html).  Here
> is a small snippet of what's in the docs:
> 
> int opt;
> po::options_description desc("Allowed options");
> desc.add_options()
>     ("help", "produce help message")
>     ("optimization", po::value<int>(&opt)->default_value(10),
>   "optimization level")
>     ("include-path,I", po::value< vector<string> >(),
>   "include path")
>     ("input-file", po::value< vector<string> >(), "input file")
> ;
> 
> The tutorial section in the docs isn't 100% clear about what this
> does, but I'm pretty sure if you have a command-line with (for
> example) multiple --include-path options, then push_back is called on
> a vector in the variables_map for each instance of the --include-path
> option.  

Hi Nathan,
I've just clarified the tutorial to say that std::vector values
automatically allow multiple occurences of options.

Thanks,
Volodya