[allocator.adaptor.members]

In the construct member functions, OUTERMOST(x) is OUTERMOST(x.outer_allocator() if the expression x.outer_allocator() is valid ([temp.deduct]) and x otherwise; OUTERMOST_ALLOC_TRAITS(x) is allocator_traits<remove_reference_t<decltype(OUTERMOST(x))>.

[Note 1:

OUTERMOST(x) and OUTERMOST_ALLOC_TRAITS(x) are recursive operations.

It is incumbent upon the definition of outer_allocator() to ensure that the recursion terminates.

It will terminate for all instantiations of scoped_allocator_adaptor.

— end note]

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inner_allocator_type& inner_allocator() noexcept;
const inner_allocator_type& inner_allocator() const noexcept;

Returns: *this if sizeof.(InnerAllocs) is zero; otherwise, inner.

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outer_allocator_type& outer_allocator() noexcept;

Returns: static_cast<OuterAlloc&>(*this).

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const outer_allocator_type& outer_allocator() const noexcept;

Returns: static_cast<const OuterAlloc&>(*this).

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pointer allocate(size_type n);

Returns: allocator_traits<OuterAlloc>::allocate(outer_allocator(), n).

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pointer allocate(size_type n, const_void_pointer hint);

Returns: allocator_traits<OuterAlloc>::allocate(outer_allocator(), n, hint).

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void deallocate(pointer p, size_type n) noexcept;

Effects: As if by: allocator_traits<OuterAlloc>::deallocate(outer_allocator(), p, n);

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size_type max_size() const;

Returns: allocator_traits<OuterAlloc>::max_size(outer_allocator().

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

Effects: Equivalent to: apply([p, this](auto&. newargs) { OUTERMOST_ALLOC_TRAITS(*this)::construct( OUTERMOST(*this), p, std::forward<decltype(newargs)>(newargs).); }, uses_allocator_construction_args<T>(inner_allocator(), std::forward<Args>(args).);

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

Effects: Calls OUTERMOST_ALLOC_TRAITS(*this)::destroy(OUTERMOST(*this), p).

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scoped_allocator_adaptor select_on_container_copy_construction() const;

Returns: A new scoped_allocator_adaptor object where each allocator a1 within the adaptor is initialized with allocator_traits<A1>::select_on_container_copy_construction(a2), where A1 is the type of a1 and a2 is the corresponding allocator in *this.