Help with bit-field semantics in C and C++

[Mike Stump]

On Tuesday, August 24, 2004, at 05:21  PM, Gabriel Dos Reis wrote:
> At any single time, the value of an enum -- other than that of an
> uninitialized variable -- is always a valid enumeration value, which is
> always in the range of enumration value, here [0.3].

Is this true when you use the type between C and C++ parts of a single 
program?  If so, how?

Is this true when you have existing .o files compiled with older 
headers that have a subset of enumeration constants for a given enum?

Or, do we just ignore the real world?  Is the standard better if we do?