ios::operator!


public member function
bool operator ! ( ) const;

Evaluate stream object

Returns true if either one of the error flags (failbit or badbit) is set on the stream. Otherwise it returns false.

This behavior is equivalent to the member function fail().

Parameters

none

Return Value

true if either failbit or badbit is set.
false otherwise.

Example

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// evaluating a stream object
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  ifstream is;
  is.open ("test.txt");
  if (!is)
    cerr << "Error opening 'test.txt'\n";
  return 0;
}


Basic template member declaration

( basic_ios<charT,traits> )
  
bool operator ! () const;


See also

ios::fail Check if either failbit or badbit is set (public member function)
ios::good Check if the state of the stream is good for i/o operations. (public member function)