Re: [Boost-users] [Program Options] Requiring command-line options

Subject: Re: [Boost-users] [Program Options] Requiring command-line options
From: immanuel litzroth (ilitzroth_at_[hidden])
Date: 2010-06-03 09:09:48

This seems to work for me:
 ("namespace", po::value<std::string>(&args.name_space)->required(),"namespace
to scrub")
throws an exception when appropriate:
ERROR - main: Caught an exception exiting main: missing required
option namespace
I remember having to hunt for it too.
Greetz,
Immanuel

On Thu, Jun 3, 2010 at 9:41 AM, Jeremy Abramson <abramson_at_[hidden]> wrote:
> Heya!  I just thinking about switching from simpleOpt to BoostPO for command
> line handling, mainly because of its support of configuration files.  This
> may be a stupid question, but I haven't seen anything about making a command
> line parameter *required*.  You'd think this is a pretty common thing, but I
> didn't see any mention of it in the tutorials or anything.  I guess I could
> just make certain parameters default -1/NULL or something, and then test at
> the end if they're still equal to that, but that seems a bit ugly.
> Is there built in support (a flag in the "add_options" function or
> something) for making certain parameters required?
>
> Thanks a lot!
>
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