std::swap(std::shared_ptr)
From cppreference.com
                    
                                        
                    < cpp | memory | shared ptr
                    
                                                            
                    |   template< class T > void swap( shared_ptr<T>& lhs, shared_ptr<T>& rhs ) noexcept;  | 
(since C++11) | |
Specializes the std::swap algorithm for std::shared_ptr. Swaps the pointers of lhs and rhs. Calls lhs.swap(rhs).
Parameters
| lhs, rhs | - | smart pointers whose contents to swap | 
Return value
(none)
Complexity
Constant
See also
|    swaps the values of two objects   (function template)  | |
|    swaps the contents   (public member function)  |