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#include <bslmf_usesallocator.h>
This struct
template derives from bsl::true_type
when the (template parameter) t_TYPE
has a nested alias allocator_type
and the (template parameter) type t_ALLOC
is convertible to t_TYPE::allocator_type
, and bsl::false_type
otherwise.
See Component bslmf_usesallocator