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std::basic_ios::bad(3)	       C++ Standard Libary	  std::basic_ios::bad(3)

NAME
     std::basic_ios::bad - std::basic_ios::bad

Synopsis
	bool bad() const;

	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:

	     ios_base::iostate flags basic_ios accessors
	     eofbit  failbit  badbit good() fail() bad() eof() operator bool op-
     erator!
	     false     false	  false    true     false    false   false  true
     false
	     false    false	true	 false	  true	   true    false   false
     true
	     false     true	  false    false    true     false  false  false
     true
	     false    true	true	 false	  true	   true    false   false
     true
	     true      false	  false    false    false    false   true   true
     false
	     true     false	true	 false	  true	   true    true    false
     true
	     true      true	  false    false    true     false  true   false
     true
	     true     true	true	 false	  true	   true    true    false
     true

http://cppreference.com 	   2024.06.10		  std::basic_ios::bad(3)
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