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

From: Jon Kalb (kalb_at_[hidden])
Date: 2002-03-15 00:32:50

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_at_[hidden]