Re: [Boost-users] program_options: iterate variable_map

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-04-24 05:51:52

Fran?ois Duranleau wrote:

>> I wrote a wrapper class that adds options to a list as they are added to
>> program_options, then you can print the list. This is a hack.
> 
> Also, another 'hack' is that, looking in the code, you can notice that
> variables_map inherits from std::map as well (though it's not documented
> as such). You can thus use standard STL iterators, e.g.
> 
> for ( variables_map::iterator i = vm.begin() ; i != vm.end() ; ++ i )
> {
>     //...
> }
> 
> The type of values iterated over are pairs of std::string and
> boost::program_options::variable_value.

I have no idea why BoostBook decided to hide that inheritance, but it was
designed that way, so that you can iterate variables_map. I've added
comment to that effect to varaibles_map class docs.

- Volodya