The C++ char_traits, eq_int_type() and to_int_type() class member functions program example

 

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info: none

To do: Using eq_int_type to test whether two characters represented as int_types are equal or not and to_int_type to converts a char_type character to the corresponding int_type character and returns the result in C++ programming

To show: How to use the C++ eq_int_type() and to_int_type() char_traits class members in C++ programming

 

// the C++ char_traits members, eq_int_type() and to_int_type() example

#include <string>

#include <iostream>

using namespace std;

 

int main(void)

{

char_traits<char>::char_type chr1 = 'P';

char_traits<char>::char_type chr2 = 'Q';

char_traits<char>::char_type chr3 = 'P';

char_traits<char>::char_type chr4 = 'r';

 

// char_type to int_type conversion

char_traits<char>::int_type int1, int2, int3, int4;

int1 = char_traits<char>::to_int_type(chr1);

int2 = char_traits<char>::to_int_type(chr2);

int3 = char_traits<char>::to_int_type(chr3);

int4 = char_traits<char>::to_int_type(chr4);

 

cout<<"Operation: to_int_type(character)"<<endl;

cout<<"The char_types and corresponding int_types are:\n";

cout<<chr1<<" = "<<int1<<endl;

cout<<chr2<<" = "<<int2<<endl;

cout<<chr4<<" = "<<int4<<endl;

 

// equality of int_type representations test

cout<<"\nOperation: eq_int_type(int1, int2)"<<endl;

bool var1 = char_traits<char>::eq_int_type(int1, int2);

if(var1)

cout<<"The int_type representation of characters chr1\n"

<<"and chr2 is equal."<<endl;

else

cout<<"The int_type representation of characters chr1\n"

<<"and chr2 is not equal."<<endl;

 

// alternatively

cout<<"\nOperation: int1 == int3"<<endl;

if(int1 == int3)

cout<<"The int_type representation of characters chr1\n"

<<"and chr3 is equal."<<endl;

else

cout<<"The int_type representation of characters chr1\n"

<<"and chr3 is not equal."<<endl;

 

return 0;

}

 

Output example:

 

Operation: to_int_type(character)

The char_types and corresponding int_types are:

P = 80

Q = 81

r = 114

 

Operation: eq_int_type(int1, int2)

The int_type representation of characters chr1

and chr2 is not equal.

 

Operation: int1 == int3

The int_type representation of characters chr1

and chr3 is equal.

Press any key to continue . . .

 

 

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