Re: [Boost-users] remove_if and transform_iterator

On 12/13/05, Peter Dimov wrote:

Are you sure that you want this, even if it did compile? If you apply remove_if+transform_iterator on:

A, 2 B, 3 C, 4 D, 15 E, 16 F, 17

you'll get

A, 15 B, 16 C, 17 D, -- E, -- F, --

where -- denotes an unspeficied value.

I was not aware of this. Thanks for pointing out.

If this is the desired result, try

struct to_num { typedef int & result_type;

int & operator()(std::pair& p) const { return p.second; } };

If, on the other hand, you want

D, 15 E, 16 F, 17 --, -- --, -- --, --

you don't need transform_iterator at all:

std::remove_if( c.begin(), c.end(),

boost::bind( std::less_equal<int>(), boost::bind( to_num(), _1 ), 10 )

);

Thanks. I'm already using this way. I was just wondering if it was possible to use transform_iterator and avoid the functor. Regards, Josue Gomes