std::unexpected
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header <exception>
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|   [[noreturn]] void unexpected();  | 
(deprecated) | |
std::unexpected() is called by the C++ runtime when a dynamic exception specification is violated: an exception is thrown from a function whose exception specification forbids exceptions of this type.
std::unexpected() may also be called directly from the program.
In either case, std::unexpected calls the currently installed std::unexpected_handler. The default std::unexpected_handler calls std::terminate.
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[edit] Parameters
(none)
[edit] Return value
(none)
[edit] Exceptions
[edit] See also
|    (deprecated)  | 
    the type of the function called by std::unexpected   (typedef)  |