boost中的Tokenizer给出了链接错误

Question

我是boost和c ++的新手，我正在尝试使用tokenizer功能。 这是我的代码。

  string
        UrlUtils::get_query(std::string query_string, std::string parameter)
        {
          char_separator<char> seperator("&");
          vector<string> splits = split(query_string, seperator);
          for (int i = 0; i < splits.size(); i++)
            {
              cout << splits[i] << endl;
            }
          return "";

        }

        vector<string>
        split(std::string haystack, char_separator<char> seperator)
        {
          vector<string> splited_heystack;

          tokenizer<char_separator<char> > tokens(haystack, seperator);
          BOOST_FOREACH(string token, tokens){
          splited_heystack.push_back(token);
        }
          return splited_heystack;
        }

我收到此错误

Undefined symbols for architecture x86_64:
  "UrlUtils::split(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::char_separator<char, std::char_traits<char> >)", referenced from:
      UrlUtils::get_query(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> >)in url_utils.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

任何人都可以告诉我为什么会遇到这个问题。