[Boost-users] Re: Re: boost::program options question. Implicit() doesn't seem to work

The Grumpiest Man You Know wrote:

On Wed, 09 Mar 2005 10:41:39 +0300, Vladimir Prus wrote:

...

I think it's the library. But in any case, I plan to remove the 'implicit' flag in 1.33. Why do you want it? What about:

Really? I thought that was quite useful for things like.

$ foo --help usage: foo [-sexy-options] $ foo --help topic The "topic" option crazumps the doobryferk.

Is there a better way than implicit for that?

You can treat 'topic' as positional option and print help for all positional options when --help is specified. Say: $ foo surprise $ foo surprise --help The 'surprise' command blows your monitor up. Note that in this case you can use "--help" before and after a topic, which is an additional convenience.

Is implicit causing some ugliness that warrants it's excise?

Yes, because in the above case it's not clear if "topic" is a positional option or value of the "--help" option. I bring this issue in http://article.gmane.org/gmane.comp.lib.boost.devel/118670 - Volodya