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Showing content from https://en.cppreference.com/w/cpp/language/../memory/scoped_allocator_adaptor/helpers.html below:

std::scoped_allocator_adaptor<OuterAlloc,InnerAlloc...>::outermost, outermost-construct, outermost-destroy - cppreference.com

template< class Alloc > /* unspecified */ /*outermost*/( Alloc&& alloc = *this );

(1) (exposition only*)

template< class T, class... Args > void /*outermost-construct*/( T* p, Args&&... args );

(2) (exposition only*)

template< class T > void /*outermost-destroy*/( T* p );

(3) (exposition only*)

These exposition-only helper member function templates are used in member functions construct() and destroy().

1)

Obtains the outermost allocator of

alloc

If the expression alloc.outer_allocator() is valid, returns outermost (alloc.outer_allocator()).
Otherwise, returns alloc.

2,3) Constructs or destroys an object using the outermost allocator of *this.

2)

Equivalent to

outermost_traits::construct(outermost (), p, std::forward<Args>(args)...);

3) Equivalent to outermost_traits::destroy(outermost (), p);.

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 3116 C++11 the recursion condition for outermost was âalloc
has the member function outer_allocator()â changed to âthe expression
alloc.outer_allocator() is validâ [edit] See also constructs an object in the allocated storage
(function template) [edit] destructs an object stored in the allocated storage
(function template) [edit]

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