文本查询程序（关联容器使用）二

//TextQuery.h

#pragma once
#include <iostream>
#include <istream>
#include <fstream>
#include <sstream>
#include <vector>
#include <map>
#include <set>
#include <string>
using namespace std;

class TextQuery 
{
public:
 typedef vector<string>::size_type line_no;
 
 void read_file(ifstream &is)
 {
  store_file(is);
  build_map();
 }
 set<line_no> run_query(const string &) const;
 string text_line(line_no) const;

 TextQuery();
 virtual ~TextQuery();
private:
 void store_file(ifstream &is);
 void build_map();

 vector<string> lines_of_text;

 map< string, set<line_no> > word_map;
};
 

 

//TextQuery.cpp

#include "TextQuery.h"

TextQuery::TextQuery()
{
 
}

TextQuery::~TextQuery()
{

}

void TextQuery::store_file(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>();//return empty set
 }
 else
 {
  return loc->second;
 }
}

string TextQuery::text_line(line_no line ) const
{
 if(line <lines_of_text.size())
  return lines_of_text[line];
 throw out_of_range("line number out of range");
}

//MainFile.cpp

#include "TextQuery.h"
using namespace std;

ifstream& open_file(ifstream &in, const string &file)
{
 in.close();
 in.clear();

 in.open(file.c_str());
 return in;
}
string make_plural(size_t ctr ,const string &word,
       const string &ending)
{
 return (ctr ==1) ? word : word +ending;
}

void print_results(const set<TextQuery::line_no>& locs,
       const string &sought, const TextQuery &file)
{
 typedef set<TextQuery::line_no> line_nums;
 line_nums::size_type size = locs.size();
 cout<<endl<<sought<<"occurs"
  <<size<<"  "
  <<make_plural(size, "time", "s") <<endl;
 line_nums::const_iterator it = locs.begin();
 for (;it!= locs.end() ; ++it)
 {
  cout<< "/t(line "
   <<(*it) +1 <<" )"
   <<file.text_line(*it)<<endl;
 }
}

int main(int argc,char **argv)
{
 ifstream infile;
 if(argc<2 || !open_file(infile,argv[1]))
 {
  cerr<<"No input file!" << endl;
  return EXIT_FAILURE;
 }
 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> locs = tq.run_query(s);
  print_results(locs,s,tq);
 }
 return 0;
}

//makfile

edit : MainFile.o TestQuery.o
 g++ -o edit MainFile.o TestQuery.o

#TestQuery.o : TestQuery.cpp TestQuery.h
# g++ -c TestQuery.cpp
#MainFile.o : MainFile.cpp TestQuery.h
# g++ -c MainFile.cpp
#$(objects) : TestQuery.h
TestQuery.o MainFile.o : TestQuery.h
  
.PHONY : clean
clean :
 rm edit $(objects)

 

出错拉

$ make
make: *** No rule to make target `TestQuery.h', needed by `MainFile.o'.  Stop.