Re: [Boost-users] boost [pointer container, lambda, bind]

From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2007-12-05 12:38:57

chun ping wang skrev:
> Say lets say i have container of regular type T.
> 
> And lets say i want to insert them into ptr_vector  by getting the keys.
> 
> template< typename MapType, typename OutputIterator >
> OutputIterator getKeys(const MapType& map, OutputIterator out )
> {
>        typedef typename MapType::value_type map_type;
>        typedef typename OutputIterator::value_type out_type;
>        std::for_each(map.begin(), map.end(),
>        boost::lambda::var(*out)++ =
>        
> boost::lambda::construct<out_type>(boost::lambda::bind(&map_type::first, 
> boost::lambda::_1))
>        );
>        return out;
> }
> 
> Is it possble to do this. Assuming outputiterator is implemented for 
> ptr_vector.

I guess you post the code because it does not work?

Isn't it simpler just to write

typedef typename MApType::const_iterator i = m.begin(), e = m.end();
for( ; i 1= e; ++i )
    *out++ = i->first;

?

-Thorsten