using inner_allocator_type = see below;
Type: scoped_allocator_adaptor<OuterAlloc> if sizeof...(InnerAllocs) is
zero; otherwise,
scoped_allocator_adaptor<InnerAllocs...>.
using propagate_on_container_copy_assignment = see below;
Type: true_type if allocator_traits<A>::propagate_on_container_copy_assignment::value is true for any A in the set of OuterAlloc and InnerAllocs...; otherwise, false_type.
using propagate_on_container_move_assignment = see below;
Type: true_type if allocator_traits<A>::propagate_on_container_move_assignment::value is true for any A in the set of OuterAlloc and InnerAllocs...; otherwise, false_type.
using propagate_on_container_swap = see below;
Type: true_type if allocator_traits<A>::propagate_on_container_swap::value is true for any A in the set of OuterAlloc and InnerAllocs...; otherwise, false_type.
using is_always_equal = see below;