std::multimap::clear
From cppreference.com
                    
                                        
                    
                    
                                                            
                    
|   void clear(); 
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Removes all elements from the container.
Invalidates any references, pointers, or iterators referring to contained elements. May invalidate any past-the-end iterators.
Contents | 
[edit] Parameters
(none)
[edit] Return value
(none)
[edit] Exceptions
| (none) | (until C++11) | 
noexcept specification:   noexcept    | 
(since C++11) | 
[edit] Complexity
Linear in the size of the container.
[edit] See also
|    erases elements   (public member function)  |