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std::error_code(3)	       C++ Standard Libary	      std::error_code(3)

NAME
     std::error_code - std::error_code

Synopsis
	Defined in header <system_error>
	class error_code;		  (since C++11)

	std::error_code represents a platform-dependent error code value. Each
	std::error_code  object  holds	an error code value originating from the
     operating
	system or some low-level interface and a pointer to an object of type
	std::error_category, which corresponds to the said interface. The  error
     code values
	are not required to be unique across different error categories.

Member functions
	constructor		constructs an error code
				(public member function)
	operator=		assigns another error code
				(public member function)
	assign			assigns another error code
				(public member function)

Modifiers
	clear			 sets  the error_code to value 0 in system_cate-
     gory
				(public member function)

Observers
	value			obtains the value of the error_code
				(public member function)
	category		obtains the error_category for this error_code
				(public member function)
	default_error_condition obtains the error_condition for this error_code
				(public member function)
	message 		obtains the  explanatory  string  for  this  er-
     ror_code
				(public member function)
	operator bool		checks if the value is non-zero
				(public member function)

Non-member functions
	operator==
	operator!=
	operator<	   compares two error_codes
	operator<=>	   (function)
	(removed in C++20)
	(removed in C++20)
	(C++20)
	operator<<	    outputs the value and the category name to an output
     stream
			   (function)

Helper classes
	is_error_code_enum	   identifies a class as an error_code	enumera-
     tion
	(C++11) 		   (class template)
	std::hash<std::error_code> hash support for std::error_code
	(C++11) 		   (class template specialization)

See also
	error_condition 	   holds a portable error code
	(C++11) 		   (class)
	error_category		   base class for error categories
	(C++11) 		   (class)
	make_error_code(std::errc) creates error code value for errc enum e
	(C++11) 		   (function)

http://cppreference.com 	   2024.06.10		      std::error_code(3)
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