public attribute
The [public] attribute includes an alias declared with the typedef keyword in the type library.
typedef [public] data-type identifier;
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data-type
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The data type that the identifier will be an alias for.
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identifier
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Another name by which data-type will be known in the software.
By default, an alias that is declared with typedef and has no other attributes is treated as a #define and is not included in the type library. Using the [public] attribute ensures that the alias becomes part of the type library.
Note
The MIDL compiler requires that you explicitly apply the [public] attribute to each typedef that you want public.
typedef [public] long MEMBERID;