c++ - Print Vector elements using Boost.Bind -

i need print values inserted in vector using boost.bind. please find code snippet below:

please let me know missing here?

   class test     {         int i;      public:          test() {}          test(int _i)         {             = _i;         }          void print()         {             cout << << ",";         }     };       int main()     {         std::vector<test> vtest;         test w1(5);         test w2(6);         test w3(7);         vtest.push_back(w1);         vtest.push_back(w2);         vtest.push_back(w3);          std::for_each(vtest.begin(), vtest.end(),boost::bind(boost::mem_fn(&test::print), _1, ?)); // how print vector elements here?      } 

you can without boost this

#include <iostream> #include <vector> #include <algorithm> #include <functional>  class test {     int i; public:      test() {      }      test(int _i) {         = _i;     }      void print() const {         std::cout << << std::endl;     } };  int main() {     std::vector<test> vtest;     test w1(5);     test w2(6);     test w3(7);     vtest.push_back(w1);     vtest.push_back(w2);     vtest.push_back(w3);     // use lambda     std::for_each(vtest.begin(), vtest.end(), [&](const test& t){ t.print(); });     // use std::bind     std::for_each(vtest.begin(), vtest.end(), std::bind(&test::print, std::placeholders::_1));     return 0; }