std::multiset<Key,Compare,Allocator>::value_comp
From cppreference.com
                    
                                        
                    
                    
                                                            
                    
|   std::multiset::value_compare value_comp() const;  | 
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Returns the function object that compares the values. It is the same as key_comp.
Parameters
(none)
Return value
The value comparison function object.
Complexity
Constant.
See also
|    returns the function that compares keys  (public member function)  |