On Fri, Jan 25, 2013 at 10:21 AM, Dave Abrahams <dave@boostpro.com> wrote:
Isn't leaving the class with it's invariants broken simply a defect?
Yes. IIUC the question here is whether the invariant of variant [;-)] shall be weakened to accommodate efficient move semantics, thereby breaking some code, or not, at some cost (the specific costs to be incurred by various strategies presently under discussion).
But I have to admit, I haven't been reading the thread all that carefully, so I could be mis-understanding completely.
Instead of weakened, which is one option discussed, I would also characterize much of the discussion as "let's ignore that the invariant is broken, because no one should rely on invariants after move". If you had opinions on that aspect, you might want to weigh in. It would be appreciated. Tony