Re: Does filter_iterator work for maps?

16 Mar 2002

      --- In Boost-Users@y..., Jon Kalb <kalb@L...> wrote:
...
At 3:01 AM +0000 3/15/02, rodrigo_braz wrote:
...
copy(boost::make_filter_iterator<pair_is_active>(m.begin, m.end
()),
copy(boost::make_filter_iterator<pair_is_active>(m.begin(), m.end
()),
Ouch. Ok, sorry about that. Actually my main problem with this 
iterator is in the code below:

#include <vector>
#include "boost/iterator_adaptors.hpp"

using namespace std;
using namespace boost;

struct is_active {
  bool operator()(int p) { return 0 < p; }
};

struct A
{
  typedef 
filter_iterator_generator<is_active,vector<int>::iterator>::type 
active_iterator;
  active_iterator i; // PROBLEM
};

int main()
{
  A a;
  return 0;
}

I get the error messages:

15: Type name expected
15: Multiple declaration for 'A::active_iterator'
14: Earlier declaration of 'A::active_iterator'
15: Declaration missing ;

Thanks,

Rodrigo