std::system_error::system_error(3) - FreeBSD Ports 15.1.quarterly Manual Pages

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std::system...system_error(3)  C++ Standard Libary std::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 cate-
     gory ecat.
	4) Constructs with underlying error code ev, associated  error	category
     ecat and
	explanatory string what_arg. The string returned by what() is guaranteed
     to contain
	what_arg  as  a  substring (assuming that it doesn't contain an embedded
     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::strcmp(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(), "FIX ME");
	  }
	  catch (const std::system_error& ex)
	  {
	      std::cout << "code:    [" << ex.code() << "]\n"
			   "message: [" << ex.code().message() << "]\n"
			   "what:    [" << ex.what() << "]\n";
	  }
      }

Possible output:
      code:    [generic:33]
      message: [Numerical argument out of domain]
      what:    [FIX ME: Numerical argument out of domain]

http://cppreference.com 	   2024.06.10	   std::system...system_error(3)

NAME | Synopsis | Parameters | Example | Possible output:

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