#include <boost/lexical_cast.hpp>
#include <cassert>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>

std::ostream & operator<<(std::ostream & out, const std::vector<long> & v)
{
  std::ostream_iterator<long> it(out);
  std::copy(v.begin(), v.end(), it);
  assert(out);
  return out;
}

int main()
{
  try {
    std::vector<long> v;
    // Uncomment the following line and no exception is thrown.
    // v.push_back(1);
    std::cout << boost::lexical_cast<std::string>(v) << std::endl;
  } catch (const boost::bad_lexical_cast & ex) {
    std::cerr << ex.what() << std::endl;
    return EXIT_FAILURE;
  }
}