(Original example) how to add a line feed to a program notebook? (C/C ++) (STL)

Abstract
If you need to put the program into a word report or file, maybe we want to add a line of code to the program for easy solution, what should we do as the blog shows program discovery?

Introduction
Use environment: Visual C ++ 9.0/Visual Studio 2008

A section of C ++ small program can be added to the program example and then exported.

Map_code_line.cpp/C ++

1 /*  
2 (C) oomusou 2008 Http://oomusou.cnblogs.com
3
4 Filename: map_code_line.cpp
5 Compiler: Visual C ++ 9.0/Visual Studio 2008
6 Description: Demo how to add line number for code
7 Release: 07/18/2008 1.0
8 */
9 # Include < Iostream >
10 # Include < Fstream >
11 # Include < String >
12 # Include < Map >
13 # Include < Algorithm >
14
15 Using   Namespace STD;
16
17 Ifstream infile ( " Map_code_line.cpp " );
18 Ofstream OUTFILE ( " Map_code_line_r.cpp " );
19
20 Struct Print_map {
21 Void   Operator () (Pair < Int , String > P ){
22 Cout < P. First <   "   "   < P. Second < Endl;
23 OUTFILE < P. First <   "   "   < P. Second < Endl;
24 }
25 };
26
27 Int Main (){
28 Map < Int , String > Lines;
29
30 String Line;
31 Int Line_num =   1 ;
32 While (Getline (infile, line ))
33 Lines [line_num ++ ] = Line;
34
35 Infile. Close ();
36
37 For_each (lines. Begin (), lines. End (), print_map ());
38 OUTFILE. Close ();
39 }

Results

1 /*
2 (C) oomusou 2008 Http://oomusou.cnblogs.com
3  
4 Filename: map_code_line.cpp
5 Compiler: Visual C ++ 9.0 /Visual Studio 2008
6 Description: Demo how to add line number for code
7 Release: 07 / 18 / 2008   1.0
8 */
9 # Include <iostream>
10 # Include <fstream>
11 # Include <string>
12 # Include <map>
13 # Include <algorithm>
14  
15 Using namespace std ;
16  
17 Ifstream infile ( " Map_code_line.cpp " ) ;
18 Ofstream OUTFILE ( " Map_code_line_r.cpp " ) ;
19
20 Struct print_map {
21 Void operator () (pair <int , String> P ){
22 Cout <p. First < "   " <P. Second <Endl ;
23 OUTFILE <p. First < "   " <P. Second <Endl ;
24 }
25 } ;
26  
27 Int main (){
28 Map <int , String> lines ;
29  
30 String line ;
31 Int line_num =   1 ;
32 While (Getline (infile , Line ))
33 Lines [ Line_num ++ ]   = Line ;
34  
35 Infile. Close () ;
36
37 For_each (lines. Begin () , Lines. End () , Print_map ()) ;
38 OUTFILE. Close () ;
39 }

32 rows

While (Getline (infile, line ))
Lines [line_num ++ ] = Line;

Is the concern of the entire program:Use Map, Key stores the rows, and value stores the program records of each row. In addition, each line of the program is automatically added.

37 rows

For_each (lines. Begin (), lines. End (), print_map ());

Print the map content. Because map cannot work with copy (), you have to leave the map and use for_each () and functor.

20 rows

Struct Print_map {
Void   Operator () (Pair < Int , String > P ){
Cout < P. First <   "   "   < P. Second < Endl;
OUTFILE < P. First <   "   "   < P. Second < Endl;
}
};

With for_each () functor, 22 Lines of cout can be removed, but it is only shown on the terminal screen.

Conclusion
STL map is a very useful container, especially the substring embedding method. If there are no elements in the index, it will be automatically added, so lines [line_number ++] = line; this beautiful method.

See also
(formerly known as "lead") Is there a more convenient way to export map workers to cout? (C/C ++) (STL)
(formerly called functions) How to Use Function objects? (C/C ++) (STL)
(formerly called) function pointer, delegate, and function object (C/C ++) (Template )(. net) (C #)
(formerly called forward) How to Use the forward circle (using for_each) correctly )? (C/C ++) (STL) (Template)