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Incomplete
enum
types
You can define an enum
tag without specifying its possible values. This results in an incomplete
type, much like what you get if you write struct
foo
without describing the elements. A later declaration which does specify
the possible values completes the type.
You can’t allocate variables
or storage using the type while it is incomplete. However, you can work
with pointers to that type.
This extension may not be
very useful, but it makes the handling of enum
more consistent with the way struct
and union
are handled.
This extension is not supported
by GNU C++.