std::stop_source::stop_requested
From cppreference.com
                    
                                        
                    < cpp | thread | stop source
                    
                                                            
                    |   bool stop_requested() const noexcept;  | 
(since C++20) | |
Checks if the stop_source object has a stop-state and that state has received a stop request.
Parameters
(none)
Return value
true if the stop_token object has a stop-state and it has received a stop request, false otherwise.
Example
| This section is incomplete Reason: no example  |