cpp/memory/scoped allocator adaptor/inner allocator

Obtains a reference to the inner allocator used to declare this.

If, that is, no inner allocators were declared, returns. Otherwise returns a reference to, that is, a scoped allocator composed of all inner allocators of , with the first inner allocator becoming the outer allocator.

Parameters
(none)

Return value
A reference to the inner allocator, which is itself a.