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

15 Mar 2002


      At 3:01 AM +0000 3/15/02, rodrigo_braz wrote:
...
#include <map>
#include <ostream>
#include <iostream>
...
#include "boost/iterator_adaptors.hpp"
#include <algorithm>
using namespace std;
using namespace boost;
struct pair_is_active {
  bool operator()(const pair<const size_t,float>& p) { return 0 <
p.second; }
};
ostream& operator<<(ostream& o, pair<const size_t, float> p)
{
  return o << "(" << p.first << ", " << p.second << ")";
}
int main()
{
  map<size_t,float> m;
  m[0] = 10;
  m[1] = 15;
  m[2] = 0;
  m[3] = 13;
copy(boost::make_filter_iterator<pair_is_active>(m.begin, m.end()),
copy(boost::make_filter_iterator<pair_is_active>(m.begin(), m.end()),
...
boost::make_filter_iterator<pair_is_active>(m.end(), m.end()),
       ostream_iterator<pair<const size_t,float> >(cout,","));
return 0;
}
-- 
Jon Kalb
Kalb@LibertySoft.com