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std::system...system_error(3) C++ Standard Libarystd::system...system_error(3)

NAME
       std::system_error::system_error - std::system_error::system_error

Synopsis
	  system_error(	std::error_code	ec );				   (1)
       (since C++11)
	  system_error(	std::error_code	ec, const std::string& what_arg	); (2)
       (since C++11)
	  system_error(	std::error_code	ec, const char*	what_arg );	   (2)
       (since C++11)
	  system_error(	int ev,	const std::error_category& ecat	);	   (3)
       (since C++11)
	  system_error(	int ev,	const std::error_category& ecat,	   (4)
       (since C++11)
	  const	std::string& what_arg );
	  system_error(	int ev,	const std::error_category& ecat,	   (4)
       (since C++11)
	  const	char* what_arg );
	  system_error(	const system_error& other ) noexcept;		   (5)
       (since C++11)

	  Constructs new system	error object.

	  1) Constructs	with error code	ec
	  2)  Constructs  with	error code ec and explanation string what_arg.
       The string
	  returned by what() is	guaranteed to contain what_arg as a substring.
	  3) Constructs	with underlying	error code  ev	and  associated	 error
       category	ecat.
	  4)  Constructs with underlying error code ev,	associated error cate-
       gory ecat and
	  explanatory string what_arg. The string returned by what() is	 guar-
       anteed to contain
	  what_arg  as a substring (assuming that it doesn't contain an	embed-
       ded null	character
	  ).
	  5) Copy constructor. Initializes the contents	with those  of	other.
       If *this	and
	  other	 both  have  dynamic  type  std::system_error  then  std::str-
       cmp(what(),
	  other.what())	== 0.

Parameters
	  ec	   - error code
	  ev	   - underlying	error code in the enumeration associated  with
       ecat
	  ecat	   - the category of error
	  what_arg - explanatory string
	  other	   - another system_error to copy

Example
	  Demonstrates	how  to	 create	a system_error exception from an errno
       value.

       // Run this code

	#include <iostream>
	#include <system_error>

	int main()
	{
	    try
	    {
		throw std::system_error(EDOM, std::generic_category(),	"hello
       world");
	    }
	    catch (const std::system_error& ex)
	    {
		std::cout << ex.code() << '\n';
		std::cout << ex.code().message() << '\n';
		std::cout << ex.what() << '\n';
	    }
	}

Possible output:
	generic:33
	Numerical argument out of domain
	hello world: Numerical argument	out of domain

http://cppreference.com		  2022.07.31	 std::system...system_error(3)

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