Re: [Boost-users] Iterator over values of std::map<K, V>

From: John Kiopela (john.kiopela_at_[hidden])
Date: 2007-11-30 04:59:51

Thanks a lot both. Transform Iterator did the trick.

Kind regards,

John

On Nov 29, 2007 9:04 PM, Niels Aan de Brugh <niels_at_[hidden]> wrote:

> On 2007-11-29, John Kiopela <john.kiopela_at_[hidden]> wrote:
> >
> > I have been browsing through the docs, but I couldn't find anything
> useful.
> > Does Boost have a std::map<K, V>::iterator adaptor which iterates over
> the
> > values of the map only.
>
> What about using a boost::transform_iterator<>? Docs at:
>
>  http://boost.org/libs/iterator/doc/transform_iterator.html
>
> You'd have to supply it with a function object that returns the 'second'
> member variable of the pair, e.g.
>
>  struct get_pair_value
>  {
>      template< typename K, typename V >
>      V operator()( std::pair< K, V > const& pr )
>      { return pr.second; }
>  };
>
> Or you could use Boost.Lambda.
>
> N.
>
>
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