Re: [Boost-users] [program_options] Named values

From: Vladimir Prus (ghost_at_[hidden])
Date: 2008-02-19 10:58:35

Igor Mikushkin wrote:

> Hi!
> 
> I have already asked this question about a month ago.
> But it wasn't answered and I suppose to repeat.
> 
> I cannot find in docs how to create named vales
> for producing output like shown in this example from docs:
> 
>    $bin/gcc/debug/multiple_sources --help
>    Allows options:
> 
>    Generic options:
>      -v [ --version ]       : print version string
>      --help                 : produce help message
> 
>    Configuration:
>      --optimization n       : optimization level
>      -I [ --include-path ] path : include path
> 
> The "--include-path" option shown above has "path" parameter,
> what I have is "arg".

The docs example appears to be stale -- the code always
produces 'args'. I think it's OK, because it relieves you
from the need to think out witty names for parameters. Above,
the word 'path' occurs three times on a line, and probably
does not add much value.

> 
> Also I don't understand how to restrict hidden values.
> 
> For example I want command "myutil --help restrict this" to throw
> an exception because of "restrict" and "this" but it doesn't do it.

Why? 'restrict' appears to the value of the option --help, and this
is an argument. What's wrong?

- Volodya