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#include <bslma_allocatortraits.h>
This struct
template sets the boolean type for the attribute named is_always_equal
to the nested type alias in the given (template parameter) ALLOC
if ALLOC
defines such an alias (i.e., if true == AllocatorTraits_HasIsAlwaysEqual<ALLOCATOR_TYPE>value
).
See Component bslma_allocatortraits