word_count.cpp File Reference

#include <iomanip>
#include <ios>
#include <iostream>
#include <istream>
#include <locale>
#include <map>
#include <ostream>
#include <string>

Go to the source code of this file.

Classes
class	function
class	non_letter
class	lowercase
class	sanitizer
Typedefs
typedef std::map < std::string, int >	count_map
	Map words to counts.
typedef count_map::iterator	count_iter
	Iterate over a count_map.
typedef std::string::size_type	str_size
	String size type.
Functions
void	initialize_streams ()
str_size	get_longest_key (count_map map)
void	print_pair (count_iter iter, str_size longest)
void	print_counts (count_map counts)
int	main ()

---

Detailed Description

Definition in file word_count.cpp.

---

Typedef Documentation

typedef std::map<std::string, int> count_map

Map words to counts.

Listing 21-2. New main Function that Sets the Global Locale

Definition at line 12 of file word_count.cpp.

---

Function Documentation

str_size get_longest_key

(

count_map

map

)

Find the longest key in a map.

Parameters:

map

the map to search

Returns:

the size of the longest key in map

Definition at line 31 of file word_count.cpp.

Referenced by print_counts().

void initialize_streams

(

)

Initialize the I/O streams by imbuing them with the global locale. Use this function to imbue the streams with the native locale. C++ initially imbues streams with the classic locale.

Definition at line 21 of file word_count.cpp.

Referenced by main().

int main

(

)

Main program to count unique words in the standard input.

Definition at line 149 of file word_count.cpp.

References initialize_streams(), and print_counts().

void print_counts

(

count_map

counts

)

Print the results in neat columns.

Parameters:

counts

the map of all the counts

Definition at line 57 of file word_count.cpp.

References get_longest_key(), and print_pair().

Referenced by main().

void print_pair	(	count_iter	iter,
		str_size	longest
	)

Print the word, count, newline. Keep the columns neatly aligned. Rather than the tedious operation of measuring the magnitude of all the counts and then determining the necessary number of columns, just use a sufficiently large value for the counts column.

Parameters:

	iter	an iterator that points to the word/count pair
	longest	the size of the longest key; pad all keys to this size

Definition at line 47 of file word_count.cpp.

Referenced by print_counts().

---