ios manipulators nounitbuf() function in C++

ios manipulators unitbuf() function in C++

Last Updated : 28 Aug, 2019

The unitbuf() method of stream manipulators in C++ is used to set the unitbuf format flag for the specified str stream. This flag flushes the associated buffer after each operation.

Syntax:

ios_base& unitbuf (ios_base& str)

Parameters: This method accepts str as a parameter which is the stream for which the format flag is affected.

Return Value: This method returns the stream str with unitbuf format flag set.

Example 1:

// C++ code to demonstrate 
// the working of unitbuf() function 
  
#include <iostream> 
#include <sstream> 
  
using namespace std; 
  
int main() 
{ 
  
    // Initializing the character 
    char a, b, c; 
  
    // Stream input with leading whitespaces 
    istringstream iss("GFG"); 
  
    // Using unitbuf() 
    // buffer flushed 3 times 
    iss >> unitbuf >> a >> b >> c; 
  
    cout << "unitbuf flag: "
         << a << endl 
         << b << endl 
         << c << endl; 
  
    return 0; 
} 

Output:

unitbuf flag: G
F
G

Example 2:

// C++ code to demonstrate 
// the working of unitbuf() function 
  
#include <iostream> 
#include <sstream> 
  
using namespace std; 
  
int main() 
{ 
  
    // Initializing the character 
    char a, b, c, d, e; 
  
    // Stream input with leading whitespaces 
    istringstream iss("GEEKS"); 
  
    // Using unitbuf() 
    // buffer flushed 5 times 
    iss >> unitbuf >> a >> b >> c >> d >> e; 
  
    cout << "unitbuf flag: "
         << a << endl 
         << b << endl 
         << c << endl 
         << d << endl 
         << e << endl; 
  
    return 0; 
} 

Output:

unitbuf flag: G
E
E
K
S

Reference: http://www.cplusplus.com/reference/ios/unitbuf/

ios manipulators nounitbuf() function in C++

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