>  And one important point: there are only three unnamed parameters. There's
a
>  bunch of other things that can be configured, and they all use *named*
>  interface:
> 
>     desc.add_options()
>         ("output", "file", "output file name").default_value("/tmp/abc")
>         ;

The question arize: Why do you prefer option description to defalt value,
optional and other modifiers (I still could not reveal the mystery of second
parameter, so couldn't comment here). I prefer treat them all same way.

Gennadiy.





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