Comprehensive application of C++primer container: Text Query procedure

1#include <iostream>2#include <string>3#include <fstream>4#include <sstream>5#include <vector>6#include <map>7#include <Set>8 9 using namespace:: STD;Ten /*to complete a simple word Query task, you first need to create a class textquery to help us with this task, in which the private One internally called objects and functions, create read_file in public to read a file into a map container saved in a vector and associated with each word and line number A finds a string through the Run_query function and returns a set object containing each line number that the word appears to use Text_line to output each row*/ - classtextquery{ -  Public: thetypedef vector<string>:: Size_type line_no; -      voidRead_file (Ifstream & is)//each time the function reads a line from the file and saves it in the container vector -          //, the map container for each word and line number associated will be created when you are finished typing -{Store_file ( is); Build_map (); } +      Set<line_no> Run_query (Const string&)Const;//The parameter is a string object that returns a set object that contains the line number of all the rows of the string object -      stringText_line (Line_no)Const;//its formal parameter is a line number that returns the line of text that corresponds to the line number in the input text +  A  at Private: -     voidStore_file (Ifstream & is); -     voidBuild_map (); -vector<string>Lines_of_text; -map<string,Set<line_no> >Word_map; - }; in  - /*reads the contents of each line of the previously entered infile.txt into a Vector<string> object, including.*/ to voidTextquery::store_file (Ifstream & is) + { -     stringTextline; the      while(Getline ( is, textline)) *Lines_of_text.push_back (Textline);//Store has access to private objects because it is in public $     //cout<<lines_of_text[0];Panax Notoginseng  - } the /*use Istringstream to enter text in each row into a map container, Word_map[word] represents the Set<line_no> object + The set's Insert function is then called to add the current line number to the set object. If a word appears repeatedly in the same line, no action is made*/ A voidTextquery::build_map () the { +      for(Line_no line_num=0; Line_num!=lines_of_text.size (); + +line_num) -     { $ Istringstream Line (Lines_of_text[line_num]); $         stringWord; -      while(line>>word) - Word_map[word].insert (line_num); the  -     }Wuyi } the /*The run_query function has a reference parameter to the Const string object and accesses the Word_map object with this parameter as the subscript.  - Returns a corresponding set (which contains all occurrences of the line number) if it is found, or returns an empty set*/ Wu Set<TextQuery::line_no> Textquery::run_query (Const string&query_word)Const - { Aboutmap<string,Set<line_no>>:: Const_iterator $Loc=Word_map.find (Query_word); -     if(loc==word_map.end ()) -         return Set<line_no>(); -     Else A         returnLoc->second; +  the } - /*After you run Run_query, you get a set of line numbers for the words that are found. In addition to outputting the number of occurrences of the word, $ you also want to output each line where the word is located. is through the previous vector<string> to output*/ the stringTextquery::text_line (Line_no line)Const the { the     if(line<lines_of_text.size ()) the         returnLines_of_text[line]; -     ThrowOut_of_range ("Line number out of range"); in } the /*used to read a file*/ theIfstream &open_file (Ifstream &inch,Const string&file) About { the     inch. Close ();//Close in case it is already open the     inch. Clear ();//clear any exiting errors; the     inch. Open (File.c_str ());//Open the file we were given +     return inch; - } the /*if the number of outputs is greater than 1, then the output plural*/Bayi stringMake_plural (size_t Ctr,Const string&word,Const string&ending) the { the     return(ctr==1)? word:word+ending; - } - /*outputs the number of occurrences, calls the Make_plural function, and then outputs each occurrence of the line number, and calls Text_line to output each row*/ the voidPrint_result (Const Set<textquery::line_no>&locs,Const string&sought,ConstTextquery &file) the { thetypedefSet<TextQuery::line_no>line_nums; theLine_nums::size_type size=locs.size (); -cout<<"\ n"<<sought<<"occurs"<<size<<" " the<<make_plural (Size," Time","s") <<Endl; theLine_nums::const_iterator it=Locs.begin (); the      for(; It!=locs.end (); + +it)94     { thecout<<"\ t ( Line" the<< (*it) +1<<")" the<<file.text_line (*it) <<Endl;98     } About  - 101 }102 103 104 /*Create a Textquery object to implement a simple user query session. If a query is required, then call the Run_query function and return the word the The collection of rows that appear, and calls the Print_result function to output the function*/106 intMainintargcChar**argv)107 {108 ifstream infile;109     if(!open_file (infile,"Infile.txt")) the     ThrowRuntime_error ("no Remove file");111 textquery TQ; the Tq.read_file (infile);113      while(true) the     { thecout<<"Enter word to look for, or Q to quit:"; the         strings;117Cin>>s;118         if(!cin| | s=="Q") Break;119         Set<TextQuery::line_no> locs=Tq.run_query (s); - Print_result (LOCS,S,TQ);121     122     }123     return 0;124}

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Comprehensive application of C++primer container: Text Query procedure