Re: [Boost-users] [boost program options] missing value validation

Subject: Re: [Boost-users] [boost program options] missing value validation
From: Andy F (andyf_at_[hidden])
Date: 2009-01-22 14:39:37

Vladimir Prus <vladimir <at> codesourcery.com> writes:

> Seems like some part is left out of our question "if the user does not provide
a value",
> then what?
> 
> > do I need to basically handle that in the catch block of the exception 
> > handling, or is there some other way of doing it upfront?
> 
> - Volodya
> 

Sorry, I seem to be asleep at the wheel today.  What I am saying is if the user
does not provide a value for the option, and the value is required, is my only
option to handle this in the catch block or is there a way to do this some other
way?

E.g. I define an option --env which much have a value.  If the user just runs
a.out --env, and not a.out --env=PROD, then it seems that the exception is
thrown.  Is there some way of checking it without doing the exception handling?

Thanks,
-Andy