std::allocator::deallocate
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header <memory>
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|   void deallocate(pointer p, size_type n);  | 
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Deallocates the storage referenced by the pointer p, which must be a pointer obtained by an earlier call to allocate(). The argument n must be equal to the second argument of the call to allocate() that originally produced p.
Calls ::operator delete(void*), but it is unspecified when and how it is called.
[edit] Parameters
| p | - | pointer obtained from allocate() | 
| n | - | number of objects earlier passed to allocate() | 
[edit] Return value
(none)
[edit] See also
|    allocates uninitialized storage  (public member function)  | |
|    [static]  | 
   deallocates storage using the allocator  (public static member function of std::allocator_traits)  |