Neal D. Becker wrote:
>  I'm trying to learn to use program options, posted here by Vladimir Prus.
> 
>  I was trying to use the variables map, and I wanted a "double" variable. 
>  It seems validator is specialized for float, but not double.
[...]
>  But check_first_occurence and get_single_string are in an anonymous
>  namespace, and are not accessible.
> 
>  Is there a workaround?  Should these functions be moved to a different
>  namespace to make extension more convenient?

Neal,

I've just moved those function to boost::program_options::validators
namespace. The new version is available from

  http://zigzag.cs.msu.su:7813/program_options

and also from 

  http://groups.yahoo.com/group/boost/files/

- Volodya
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