5.不用拷贝的对象可以用ref

 1 #include <iostream>
 2 #include <string>
 3 #include <boost/bind.hpp>
 4 #include <boost/function.hpp>
 5 #include <vector>
 6 #include <algorithm>
 7 #include <functional>
 8 #include <stdlib.h>
 9 using namespace std;
10 using namespace boost;
11 
12 
13 void print(std::ostream &os,int i)
14 {
15     os << i << endl;
16 }
17 
18 
19 void mainF()
20 {
21     //不可以拷贝的对象可以用ref
22     boost::function<void(int)> pt = boost::bind(print,boost::ref(cout), _1);
23 
24     vector<int > v;
25     v.push_back(11);
26     v.push_back(12);
27     v.push_back(13);
28     for_each(v.begin(), v.end(), pt);
29 
30     std::cin.get();
31 }