template <class T, class Alloc> struct uses_allocator;
Remark: automatically detects whether T has a nested allocator_type that is convertible from Alloc. Meets the BinaryTypeTrait requirements ([meta.rqmts]). The implementation shall provide a definition that is derived from true_type if a type T::allocator_type exists and is_convertible<Alloc, T::allocator_type>::value != false, otherwise it shall be derived from false_type. A program may specialize this template to derive from true_type for a user-defined type T that does not have a nested allocator_type but nonetheless can be constructed with an allocator where either:
the first argument of a constructor has type allocator_arg_t and the second argument has type Alloc or
the last argument of a constructor has type Alloc.
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