iterator/example/function_output_iterator_example.cpp

// (C) Copyright Jeremy Siek 2001-2004.
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all
// copies. This software is provided "as is" without express or
// implied warranty, and with no claim as to its suitability for any
// purpose.

// Revision History:

// 27 Feb 2001   Jeremy Siek
//      Initial checkin.

#include <iostream>
#include <string>
#include <vector>

#include <boost/function_output_iterator.hpp>

struct string_appender
{
    string_appender(std::string& s)
        : m_str(&s)
    {}
    
    void operator()(const std::string& x) const
    {
        *m_str += x;
    }

    std::string* m_str;
};

int main(int, char*[])
{
  std::vector<std::string> x;
  x.push_back("hello");
  x.push_back(" ");
  x.push_back("world");
  x.push_back("!");

  std::string s = "";
  std::copy(x.begin(), x.end(), 
            boost::make_function_output_iterator(string_appender(s)));
  
  std::cout << s << std::endl;

  return 0;
}