std::pmr::unsynchronized_pool_resource::do_is_equal
From cppreference.com
                    
                                        
                    < cpp | memory | unsynchronized pool resource
                    
                                                            
                    |   virtual bool do_is_equal( const std::pmr::memory_resource& other ) const noexcept;  | 
(since C++17) | |
Compare *this with other for identity - memory allocated using a unsynchronized_pool_resource can only be deallocated using that same resource.
Return value
this == &other
Defect report
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior | 
|---|---|---|---|
| LWG 3000 | C++17 |  unnecessary dynamic_cast was performed
 | 
removed | 
See also
|    [virtual]  | 
   compare for equality with another memory_resource (virtual private member function of std::pmr::memory_resource)  |