Re: [boost] [function_output_iterator] No accessor for wrapped function?

From: François Duranleau (duranlef_at_[hidden])
Date: 2007-10-05 21:11:14

On Fri, 5 Oct 2007, Michael Fawcett wrote:

[...]
> Shouldn't you be able to accomplish what you want following the
> example at http://www.boost.org/libs/iterator/doc/function_output_iterator.html
> ?  You would have
>
> struct averager
> {
>    averager(float3& p, int &t)
>        : m_avg(&p), m_num(&t)
>    {}
>
>    void operator()(const float3& rhs) const
>    {
>        *m_avg += rhs;
>        *m_num++;
>    }
>
>    float3* m_str;
>    int *m_num;
> };
>
> float3 avg(0, 0, 0);
> int total = 0;
> kdtree.within(bounds,
> boost::make_function_output_iterator(averager(avg, total)));
> avg /= total;

Yes, of course. I was mostly pointing out a difference from what we are 
used to in STL. I see no reason why it should be different, and it would 
actually be trivial to add the accessor.

-- 
Francois Duranleau