std::unique_lock::owns_lock
From cppreference.com
                    
                                        
                    < cpp | thread | unique lock
                    
                                                            
                    |   bool owns_lock() const; 
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(since C++11) | |
Checks whether *this owns a locked mutex or not.
Contents | 
[edit] Parameters
(none)
[edit] Return value
true if *this has an associated mutex and has acquired ownership of it, false otherwise.
[edit] Exceptions
[edit] See also
|    tests whether the lock owns its associated mutex  (public member function)  | 
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