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++.
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