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Re: [PATCH] basic_filebuf: 45628 + non-modal I/O
... wait however, I can't check at the moment, but I'm afraid _M_reading and _M_writing are also exported, unfortunately. If that's really the case the only sensible change within the ABI would be leaving them unused, let's not go the route of abusing the data members with a completely different semantics only to implement this specific improvement right now.