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Showing content from https://cplusplus.com/reference/system_error/system_error/system_error/ below:

public member function

<system_error>

std::system_error::system_error (1)

system_error (error_code ec, const string& what_arg);

(2)

system_error (error_code ec, const char* what_arg);

(3)

system_error (error_code ec);

(4)

system_error (int val, const error_category& cat, const string& what_arg);

(5)

system_error (int val, const error_category& cat, const char* what_arg);

(6)

system_error (int val, const error_category& cat);

Construct system_error

Constructs a system_error exception object with error code ec (or with an error code constructed with val and cat).

If what_arg is specified, it is incorporated into the string returned by system_error::what, which may include additional information, depending on the library implementation.

Parameters

ec: An error_code object.
what_arg: A message incorporated in the string returned by member what
val: A numerical value identifying an error code.
cat: A reference to an error_category object.