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

NAME
     std::basic_ios::setstate - std::basic_ios::setstate

Synopsis
	void setstate( iostate state );

	Sets  the  stream  error flags state in addition to currently set flags.
     Essentially
	calls clear(rdstate() | state). May throw an exception.

Parameters
		stream error state flags to set. It can be a combination of  the
     following
		constants:

	state - Constant Explanation
		goodbit  no error
		badbit	 irrecoverable stream error
		failbit  input/output operation failed (formatting or extraction
     error)
		eofbit	 associated input sequence has reached end-of-file

Return value
	(none)

Example
     // Run this code

      #include <iostream>
      #include <sstream>

      int main()
      {
	  std::ostringstream stream;

	  if (!stream.fail())
	      std::cout << "stream is not fail\n";

	  stream.setstate(std::ios_base::failbit);

	  if (stream.fail())
	      std::cout << "now stream is fail\n";

	  if (!stream.good())
	      std::cout << "and stream is not good\n";
      }

Output:
      stream is not fail
      now stream is fail
      and stream is not good

See also
	rdstate returns state flags
		(public member function)
	clear	modifies state flags
		(public member function)

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