Since there isn't any documentation about this, what's the expected behavior here? Does it require that if you include the argument, you must include a parameter, or does it mean that you have to require the argument itself? The latter is the preferred behavior (for me) but from some brief experimentation, that doesn't seem to be the case. Of course, I'm not even sure I'm using it correctly, since it's not documented anywhere. Any tips? Thanks! J.

Message: 5 Date: Fri, 4 Jun 2010 11:40:00 +0800 From: "Diederick C. Niehorster" To: boost-users@lists.boost.org Subject: Re: [Boost-users] [Program Options] Requiring command-line options Message-ID: Content-Type: text/plain; charset=UTF-8 So this is not in the documentation? Could you add a ticket in track to fix the documentation? Best, Dee On Thu, Jun 3, 2010 at 9:09 PM, immanuel litzroth wrote:

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This seems to work for me: ?("namespace", po::valuestd::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 wrote:

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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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