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namespace std{// class template scoped_allocator_adaptortemplate<class OuterAlloc,class...InnerAlloc>class scoped_allocator_adaptor; // scoped allocator operatorstemplate<class OuterA1,class OuterA2,class...InnerAllocs>bool operator==(const scoped_allocator_adaptor<OuterA1, InnerAllocs...>& a,const scoped_allocator_adaptor<OuterA2, InnerAllocs...>& b)noexcept;}

namespace std{template<class OuterAlloc,class...InnerAllocs>class scoped_allocator_adaptor:public OuterAlloc{private:using OuterTraits= allocator_traits<OuterAlloc>;// exposition only    scoped_allocator_adaptor<InnerAllocs...> inner;// exposition only public:using outer_allocator_type= OuterAlloc;using inner_allocator_type=/* see description */; using value_type=typename OuterTraits::value_type;using size_type=typename OuterTraits::size_type;using difference_type=typename OuterTraits::difference_type;using pointer=typename OuterTraits::pointer;using const_pointer=typename OuterTraits::const_pointer;using void_pointer=typename OuterTraits::void_pointer;using const_void_pointer=typename OuterTraits::const_void_pointer; using propagate_on_container_copy_assignment=/* see description */;using propagate_on_container_move_assignment=/* see description */;using propagate_on_container_swap=/* see description */;using is_always_equal=/* see description */; template<class Tp>struct rebind{using other= scoped_allocator_adaptor<        OuterTraits::template rebind_alloc<Tp>, InnerAllocs...>;};     scoped_allocator_adaptor();template<class OuterA2>      scoped_allocator_adaptor(OuterA2&& outerAlloc,const InnerAllocs&...innerAllocs)noexcept;     scoped_allocator_adaptor(const scoped_allocator_adaptor& other)noexcept;    scoped_allocator_adaptor(scoped_allocator_adaptor&& other)noexcept; template<class OuterA2>      scoped_allocator_adaptor(const scoped_allocator_adaptor<OuterA2, InnerAllocs...>& other)noexcept;template<class OuterA2>      scoped_allocator_adaptor(        scoped_allocator_adaptor<OuterA2, InnerAllocs...>&& other)noexcept;     scoped_allocator_adaptor& operator=(const scoped_allocator_adaptor&)=default;    scoped_allocator_adaptor& operator=(scoped_allocator_adaptor&&)=default;     ~scoped_allocator_adaptor();     inner_allocator_type& inner_allocator()noexcept;const inner_allocator_type& inner_allocator()constnoexcept;    outer_allocator_type& outer_allocator()noexcept;const outer_allocator_type& outer_allocator()constnoexcept;     pointer allocate(size_type n);    pointer allocate(size_type n, const_void_pointer hint);void deallocate(pointer p, size_type n);    size_type max_size()const; template<class T,class...Args>void construct(T* p, Args&&...args); template<class T>void destroy(T* p);     scoped_allocator_adaptor select_on_container_copy_construction()const;}; template<class OuterAlloc,class...InnerAllocs>    scoped_allocator_adaptor(OuterAlloc, InnerAllocs...)-> scoped_allocator_adaptor<OuterAlloc, InnerAllocs...>;}