public member function
std::ios::operator!
<ios>
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
1 2 3 4 5 6 7 8 9 10 11 12
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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;
}
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Basic template member declaration
(
basic_ios<charT,traits> )
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bool operator ! () const;
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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)