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/