#include <cstdlib>
#include <iostream>

#include <string>
#include <vector>
#include <map>
#include <set>
using namespace std;

class TextQuery
{
      public:
        typedef std::vector<std::string>::size_type  line_no;
        void read_file(std::ifstream &is)   {store_file(is);build_map();};
        std::set<line_no> run_query(const std::string&) const;
        std::string text_line(line_no) const;    
        private:
                void store_file(std::ifstream &);
                void build_map();
                std::vector<std::string> lines_of_text;
                std::map<std::string,std::set<line_no> > word_map;
      };
      void TextQuery::store_file(std::ifstream &is)
      {
           string textline;
           while(getline(is,textline))
           {
                                      lines_of_text.push_back(textline);
                                      }
       }
       void TextQuery::build_map()
       {
            for(line_no line_num=0;line_num!=lines_of_text.size();line_num++)
            {
                       // istringstream line(lines_of_text[line_num]);
                        string word;
                        while(line>>word)
                        word_map[word].insert(line_num);
                        }
        }
        set<TextQuery::line_no>
        TextQuery::run_query(const string &query_word) const
        {
                                   map<string,set<line_no> >::const_iterator
                                       loc=word_map.find(query_word);
                                       if(loc==word_map.end())
                                       return set<line_no>();
                                       else
                                       return loc->second;
                                   }
                                   
         string TextQuery::text_line(line_no line) const
         {
                if(line<lines_of_text.size())
                return lines_of_text[line];
                //throw std::out_of_range("line number out of range");
                }                          
      
int main(int argc, char *argv[])
{
    ifstream infile("gj.txt");
       if(!infile)
   {
       cerr<<"can't open \"ww.dat\"for output!"<<endl;
       exit(-1);
   }
    TextQuery tq;
    tq.read_file(infile);
    while(true)
    {
               cout<<"Enter word to look for,or q to quit:";
               string s;
               cin>>s;
               if(!cin||s=="q") break;
               set<TextQuery::line_no> loc=tq.run_query(s);
               print_results(loc,s,tq);
               
               }

    return EXIT_SUCCESS;
}
检查不出哪里有错误，请高人给指点一下啊,谢谢先！！