From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-09-25 05:02:43
Jonathan Graehl wrote:
> I grepped through the program_options source and couldn't find anything
> about declaratively specifying required options (or even more
> specifically, min/max # of occurrences), except for positional options.
Does "min/max" number of occurrences makes much sense? In variables_map, an
option is either present, or not, it cannot be present twice.
> I know it's possible to do variables_map::count("option-name") or if I
> have an impossible default value bound to an option, I could check for
> that (default would = option absence), but it might be nice to have
> "requiredness" be a declared option trait, that could show up in the
> option description.
That's something that was requested some time ago, but not yet there. I'll
note your request (really can't implement all this right before release).
I think that for now you'd have to use .count.
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