New subject: [Boost-Users] Does filter_iterator work for maps?

15 Mar 2002

      Hi,
I don't see a reason for filter_iterator not to work with map 
iterators.
However, the program below doesn't work.
I get a compiler error "Cannot generate template specialization 
from 'make_filter_iterator
(Iterator,Iterator,const Predicate &)' in function main()"

Any ideas?

Thanks,
Rodrigo

#include <map>
#include <ostream>
#include "boost/iterator_adaptors.hpp"
#include <algorithm>

using namespace std;
using namespace boost;

struct pair_is_active {
  bool operator()(const pair& p) { return 0 < 
p.second; }
};

ostream& operator<<(ostream& o, pair p)
{
  return o << "(" << p.first << ", " << p.second << ")";
}

int main()
{
  map m;
  m[0] = 10;
  m[1] = 15;
  m[2] = 0;
  m[3] = 13;

  copy(boost::make_filter_iterator(m.begin, m.end()),
       boost::make_filter_iterator(m.end(), m.end()),
       ostream_iterator >(cout,","));

  return 0;
}

Does filter_iterator work for maps?

rodrigo_braz

Jon Kalb

rodrigo_braz

Jon Kalb

Jeremy Siek

Jeremy Siek

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