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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 sys-
       tem_category
				  (public member function)

Observers
	  value			  obtains the value of the error_code
				  (public member function)
	  category		  obtains  the	error_category	for  this  er-
       ror_code
				  (public member function)
	  default_error_condition  obtains  the	 error_condition  for this er-
       ror_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  enu-
       meration
	  (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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