The operator() method of ios class in C++11 is used to any error flag of this stream is set. This includes the failbit or the badbit.
Syntax:
explicit operator bool() const;
Parameters: This method does not accept any parameter.
Return Value: This method returns false if any error bit is set of this stream, else true.
Example 1:
// C++ code to demonstrate // the working of operator() function #include <bits/stdc++.h> using namespace std;
int main()
{ // Stream
stringstream ss;
// Using operator() function
if (ss) {
cout << "No error bit is set.\n" ;
}
else {
cout << "Error bit is set.\n" ;
}
return 0;
} |
Output:
No error bit is set.
Example 2:
// C++ code to demonstrate // the working of operator() function #include <bits/stdc++.h> using namespace std;
int main()
{ // Stream
stringstream ss;
ss.clear(ss.failbit);
// Using operator() function
if (ss) {
cout << "No error bit is set.\n" ;
}
else {
cout << "Error bit is set.\n" ;
}
return 0;
} |
Output:
Error bit is set.
Reference: hhttp://www.cplusplus.com/reference/ios/ios/operator/