19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.7 Class system_error [syserr.syserr]

19.5.7.1 Class system_error overview [syserr.syserr.overview]

1

The class system_error describes an exception object used to report error conditions that have an associated error code. Such error conditions typically originate from the operating system or other low-level application program interfaces.

2

[ Note: If an error represents an out-of-memory condition, implementations are encouraged to throw an exception object of type bad_alloc [bad.alloc] rather than system_error.  — end note ]

namespace std {
  class system_error : public runtime_error {
  public:
    system_error(error_code ec, const string& what_arg);
    system_error(error_code ec, const char* what_arg);
    system_error(error_code ec);
    system_error(int ev, const error_category& ecat,
        const string& what_arg);
    system_error(int ev, const error_category& ecat,
        const char* what_arg);
    system_error(int ev, const error_category& ecat);
    const error_code& code() const noexcept;
    const char* what() const noexcept override;
  };
}