std::scoped_allocator_adaptor::outer_allocator
From cppreference.com
                    
                                        
                    < cpp | memory | scoped allocator adaptor
                    
                                                            
                    |   Defined in header  
<scoped_allocator>
  | 
||
|   outer_allocator_type& outer_allocator(); 
 | 
(1) | (since C++11) | 
|   const outer_allocator_type& outer_allocator() const; 
 | 
(2) | (since C++11) | 
Obtains a reference to the outer allocator used to declare this class.
1) returns static_cast<OuterAlloc&>(*this)
2) returns static_cast<const OuterAlloc&>(*this)
Contents | 
[edit] Parameters
(none)
[edit] Return value
A reference to OuterAlloc
[edit] Exceptions
1-2)
noexcept specification:  
noexcept
  [edit] See also
   obtains an inner_allocator reference (public member function)  |