[boost] Re: program_options - required (or min/max) number of occurences declaratively?

From: Jonathan Graehl (boost_at_[hidden])
Date: 2004-09-26 22:26:08

Michael van der Westhuizen wrote:
> Vladimir Prus wrote:
> 
>> 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.
>>
> 
> Yes, it does make sense. Two examples I can think of offhand are tcpdump
> and nmap, both of which allow you to specify the -v flag multiple times
> to increase verbosity.
>

:)  Not exactly what I was thinking - if you have a vector/list value 
type, doesn't each occurence of an option get appended to it?  I 
wouldn't personally care about min/max; required or optional are enough.

> I think that for now you'd have to use .count.
> 
> - Volodya

I do, for now.  It's not bad, but having the same information twice, in 
different sections of code, isn't perfect (I need to quit changing my 
options so much!)

-Jon