operator==,!=(std::scoped_allocator_adaptor)
From cppreference.com
                    
                                        
                    < cpp | memory | scoped allocator adaptor
                    
                                                            
                    |   template< class OuterAlloc1, class OuterAlloc2, class... InnerAllocs > bool operator==( const scoped_allocator_adaptor<OuterAlloc1, InnerAllocs...>& lhs,   | 
(since C++11) | |
|   template< class OuterAlloc1, class OuterAlloc2, class... InnerAllocs > bool operator!=( const scoped_allocator_adaptor<OuterAlloc1, InnerAllocs...>& lhs,   | 
(since C++11) | |
Compares two scoped allocator adaptors. Two such allocators are equal if:
- lhs.outer_allocator() == rhs.outer_allocator(), and
 - if sizeof...(InnerAllocs) > 0, lhs.inner_allocator() == rhs.inner_allocator().
 
Parameters
| lhs, rhs | - | scoped allocator adaptors to compare | 
Return value
1) Returns true if 
lhs and rhs are equal, false otherwise.2) Returns true if 
lhs and rhs are not equal, false otherwise.