std::basic_ios<CharT,Traits>::bad
From cppreference.com
bool bad() const;
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Returns true if non-recoverable error has occurred on the associated stream. Specifically, returns true if badbit is set in rdstate().
See ios_base::iostate for the list of conditions that set badbit.
Parameters
(none)
Return value
true if a non-recoverable error has occurred, false otherwise.
Example
Run this code
#include <cstdlib>
#include <fstream>
#include <iostream>
int main()
{
std::ifstream file("test.txt");
if (!file) // operator! is used here
{
std::cout << "File opening failed\n";
return EXIT_FAILURE;
}
// typical C++ I/O loop uses the return value of the I/O function
// as the loop controlling condition, operator bool() is used here
for (int n; file >> n;)
std::cout << n << ' ';
std::cout << '\n';
if (file.bad())
std::cout << "I/O error while reading\n";
else if (file.eof())
std::cout << "End of file reached successfully\n";
else if (file.fail())
std::cout << "Non-integer data encountered\n";
}
See also
The following table shows the value of basic_ios accessors (good(), fail(), etc.) for all possible combinations of ios_base::iostate flags: