Re: [boost] Re: Re: [program_options] 1 suggestion + 1 question

From: Rob Stewart (stewart_at_[hidden])
Date: 2004-05-07 09:21:57

Vladimir Prus wrote:
> 
>    Usage: options_description [options]
>    Allowed options:
>      --help                    : produce help message
>      --optimization arg (=10)  : optimization level
>      -I [ --include-path ] arg : include path
>      --input-file arg          : input file
> 
> The (=10) is meant to give default value. The only problem I've found is
> that we need to specify empty default value string for std::vector, which
> leads to code like this:
> 
>     ("second", value< vector<int > >()->default_value(vector<int>(1, 1),
>     ""))
> 
> Ok, maybe we just need 'vector_value' function which will take care of
> default values.

The default value could simply be given as a string in that case:
"(1,1)" or whatever.  You could also use the OutputFormatters
library when it is accepted into Boost.  (In that case, you just
wait for your automated solution.)

-- 
Rob Stewart                           stewart_at_[hidden]
Software Engineer                     http://www.sig.com
Susquehanna International Group, LLP  using std::disclaimer;