desc.add_options()
            ("help,h", "Show help message")
            ("file,f", po::value< vector<string> >(), "File")
        ;
        po::store(po::parse_command_line(argc, argv, desc), vm);
        po::notify(vm);

        cout << vm["file"].as< vector<string> >() << endl;

########

src/main.cc:41: error: no match for 'operator<<' in 'std::cout << ((const boost::program_options::variable_value*)vm.boost::program_options::variables_map::operator[](((const std::string&)(& std::basic_string<char, std::char_traits<char>, std::allocator<char> >(((const char*)"file"), ((const std::allocator<char>&)((const std::allocator<char>*)(& std::allocator<char>()))))))))->boost::program_options::variable_value::as [with T = std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]()'
/usr/include/c++/4.4/ostream:108: note: candidates are: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>& (*)(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]